ui: add peer:true in package-lock.json

Bumps [tar](https://github.com/isaacs/node-tar) from 7.5.3 to 7.5.6.
- [Release notes](https://github.com/isaacs/node-tar/releases)
- [Changelog](https://github.com/isaacs/node-tar/blob/main/CHANGELOG.md)
- [Commits](https://github.com/isaacs/node-tar/compare/v7.5.3...v7.5.6)

---
updated-dependencies:
- dependency-name: tar
  dependency-version: 7.5.6
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/containers.yml

@@ -10,17 +10,36 @@ on:
   # Allows manual triggering of the workflow
   workflow_dispatch:
 
+  # Run on workflow file changes (without pushing)
+  push:
+    paths:
+      - '.github/workflows/containers.yml'
+      - 'docker/build-container.sh'
+
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        platform: [intel, cuda, vulkan, cpu, musa]
+        platform: [intel, cuda, vulkan, cpu, musa, rocm]
       fail-fast: false
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Free up disk space
+        if: matrix.platform == 'rocm'
+        run: |
+          echo "Before cleanup:"
+          df -h
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /opt/hostedtoolcache/CodeQL
+          sudo docker system prune -af
+          echo "After cleanup:"
+          df -h
+
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v2
         with:
@@ -31,7 +50,7 @@ jobs:
       - name: Run build-container
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: ./docker/build-container.sh ${{ matrix.platform }} true
+        run: ./docker/build-container.sh ${{ matrix.platform }} ${{ github.event_name != 'push' }}
 
   # note make sure mostlygeek/llama-swap has admin rights to the llama-swap package
   # see: https://github.com/actions/delete-package-versions/issues/74

CLAUDE.md

@@ -5,14 +5,16 @@ llama-swap is a light weight, transparent proxy server that provides automatic m
 ## Tech stack
 
 - golang
-- typescript, vite and react for UI (ui/)
+- typescript, vite and react for UI (located in ui/)
 
 ## Workflow Tasks
 
 - when summarizing changes only include details that require further action
 - just say "Done." when there is no further action
 - use `gh` to create PRs and load issues
-- do not mention "created by claude" in commit messages
+- do include Co-Authored-By or created by when committing changes or creating PRs
+- keep PR descriptions short and focused on changes.
+  - never include a test plan
 
 ## Testing
 
@@ -39,8 +41,9 @@ fixes #123
 
 - use three levels High, Medium, Low severity
 - label each discovered issue with a label like H1, M2, L3 respectively
-- High severity are must fix issues:
+- High severity are must fix issues (security, race conditions, critical bugs)
-
+- Medium severity are recommended improvements (coding style, missing functionality, inconsistencies)
-  - security issues
+- Low severity are nice to have changes and nits
-
+- Include a suggestion with each discovered item
-- Medium are recommended improvements
+- Limit your code review to three items with the highest priority first
+- Double check your discovered items and recommended remediations

README.md

@@ -27,6 +27,7 @@ Built in Go for performance and simplicity, llama-swap has zero dependencies and
   - `v1/images/edits`
 - ✅ Anthropic API supported endpoints:
   - `v1/messages`
+  - `v1/messages/count_tokens`
 - ✅ llama-server (llama.cpp) supported endpoints
   - `v1/rerank`, `v1/reranking`, `/rerank`
   - `/infill` - for code infilling

config-schema.json

@@ -188,11 +188,17 @@
                                 "default": "",
                                 "pattern": "^[a-zA-Z0-9_, ]*$",
                                 "description": "Comma separated list of parameters to remove from the request. Used for server-side enforcement of sampling parameters."
+                            },
+                            "setParams": {
+                                "type": "object",
+                                "additionalProperties": true,
+                                "default": {},
+                                "description": "Dictionary of parameters to set/override in requests. Useful for enforcing specific parameter values. Protected params like 'model' cannot be overridden. Values can be strings, numbers, booleans, arrays, or objects."
                             }
                         },
                         "additionalProperties": false,
                         "default": {},
-                        "description": "Dictionary of filter settings. Only stripParams is supported."
+                        "description": "Dictionary of filter settings. Supports stripParams and setParams."
                     },
                     "metadata": {
                         "type": "object",
@@ -320,6 +326,26 @@
                             "minLength": 1
                         },
                         "description": "A list of models served by the peer."
+                    },
+                    "filters": {
+                        "type": "object",
+                        "properties": {
+                            "stripParams": {
+                                "type": "string",
+                                "default": "",
+                                "pattern": "^[a-zA-Z0-9_, ]*$",
+                                "description": "Comma separated list of parameters to remove from the request. Useful for removing parameters that the peer doesn't support."
+                            },
+                            "setParams": {
+                                "type": "object",
+                                "additionalProperties": true,
+                                "default": {},
+                                "description": "Dictionary of parameters to set/override in requests to this peer. Useful for injecting provider-specific settings. Protected params like 'model' cannot be overridden. Values can be strings, numbers, booleans, arrays, or objects."
+                            }
+                        },
+                        "additionalProperties": false,
+                        "default": {},
+                        "description": "Dictionary of filter settings for peer requests. Supports stripParams and setParams."
                     }
                 }
             },

config.example.yaml

@@ -70,16 +70,6 @@ sendLoadingState: true
 #   all fields except for Id so chat UIs can use the alias equivalent to the original.
 includeAliasesInList: false
 
-# apiKeys: require an API key when making requests to inference endpoints
-# - optional, default: []
-# - when empty (the default) authorization will not be checked as llama-swap is default-allow
-# - each key is a non-empty string
-apiKeys:
-  - "sk-hunter2"
-  # hint, one liner: printf "sk-%s\n" "$(head -c 48 /dev/urandom | base64 )"
-  - "sk-gyCPiKUcIfPlaM4OSMZekkprgijPx6+OsmQs8Rsg0xZ9qpy6gKWsIKqHOk+cgXVx"
-  - "sk-+QtIn0Zjj4UHjiaZYiZEnru4mrwKM9RzhmJeK5SobNXLl8QMFXxGz1/2lEuvQpkb"
-
 # macros: a dictionary of string substitutions
 # - optional, default: empty dictionary
 # - macros are reusable snippets
@@ -90,6 +80,9 @@ apiKeys:
 # - macro names must not be a reserved name: PORT or MODEL_ID
 # - macro values can be numbers, bools, or strings
 # - macros can contain other macros, but they must be defined before they are used
+# - environment variables can be referenced with ${env.VAR_NAME} syntax
+#   - env macros are substituted first, before regular macros
+#   - if the env var is not set, config loading will fail with an error
 macros:
   # Example of a multi-line macro
   "latest-llama": >
@@ -102,6 +95,24 @@ macros:
   # but they must be previously declared.
   "default_args": "--ctx-size ${default_ctx}"
 
+  # Example of environment variable macros
+  # - ${env.VAR_NAME} pulls the value from the system environment
+  # - useful for paths, secrets, or machine-specific configuration
+  "models_dir": "${env.HOME}/models"
+
+# apiKeys: require an API key when making requests to inference endpoints
+# - optional, default: []
+# - when empty (the default) authorization will not be checked as llama-swap is default-allow
+# - each key is a non-empty string
+apiKeys:
+  - "sk-hunter2"
+  # tip, one liner: printf "sk-%s\n" "$(head -c 48 /dev/urandom | base64 )"
+  - "sk-gyCPiKUcIfPlaM4OSMZekkprgijPx6+OsmQs8Rsg0xZ9qpy6gKWsIKqHOk+cgXVx"
+
+  # use environment variable macros to keep secrets out of the config
+  - "${env.API_KEY_1}"
+  - "${env.API_KEY_2}"
+
 # models: a dictionary of model configurations
 # - required
 # - each key is the model's ID, used in API requests
@@ -185,7 +196,7 @@ models:
 
     # filters: a dictionary of filter settings
     # - optional, default: empty dictionary
-    # - only stripParams is currently supported
+    # - same capabilities as peer filters (stripParams, setParams)
     filters:
       # stripParams: a comma separated list of parameters to remove from the request
       # - optional, default: ""
@@ -195,6 +206,16 @@ models:
       # - recommended to stick to sampling parameters
       stripParams: "temperature, top_p, top_k"
 
+      # setParams: a dictionary of parameters to set/override in requests
+      # - optional, default: empty dictionary
+      # - useful for enforcing specific parameter values
+      # - protected params like "model" cannot be overridden
+      # - values can be strings, numbers, booleans, arrays, or objects
+      setParams:
+        # Example: enforce specific sampling parameters
+        temperature: 0.7
+        top_p: 0.9
+
     # metadata: a dictionary of arbitrary values that are included in /v1/models
     # - optional, default: empty dictionary
     # - while metadata can contains complex types it is recommended to keep it simple
@@ -365,7 +386,8 @@ peers:
     # - optional, default: ""
     # - if blank, no key will be added to the request
     # - key will be injected into headers: Authorization: Bearer <key> and x-api-key: <key>
-    apiKey: sk-your-openrouter-key
+    # - can be a string or a macro
+    apiKey: ${env.OPENROUTER_API_KEY}
     models:
       - meta-llama/llama-3.1-8b-instruct
       - qwen/qwen3-235b-a22b-2507
@@ -373,3 +395,23 @@ peers:
       - z-ai/glm-4.7
       - moonshotai/kimi-k2-0905
       - minimax/minimax-m2.1
+    # filters: a dictionary of filter settings for peer requests
+    # - optional, default: empty dictionary
+    # - same capabilities as model filters (stripParams, setParams)
+    filters:
+      # stripParams: a comma separated list of parameters to remove from the request
+      # - optional, default: ""
+      # - useful for removing parameters that the peer doesn't support
+      # - the `model` parameter can never be removed
+      stripParams: "temperature, top_p"
+
+      # setParams: a dictionary of parameters to set/override in requests to this peer
+      # - optional, default: empty dictionary
+      # - useful for injecting provider-specific settings like data retention policies
+      # - protected params like "model" cannot be overridden
+      # - values can be strings, numbers, booleans, arrays, or objects
+      setParams:
+        # Example: enforce zero-data-retention for OpenRouter
+        provider:
+          data_collection: "deny"
+          zdr: true

docker/build-container.sh

@@ -2,21 +2,37 @@
 
 cd $(dirname "$0")
 
+# use this to test locally, example:
+# GITHUB_TOKEN=$(gh auth token) LOG_DEBUG=1 DEBUG_ABORT_BUILD=1 ./docker/build-container.sh rocm
+# you need read:package scope on the token. Generate a personal access token with
+# the scopes: gist, read:org, repo, write:packages
+# then: gh auth login (and copy/paste the new token)
+
+log_debug() {
+    if [ "$LOG_DEBUG" = "1" ]; then
+        echo "[DEBUG] $*"
+    fi
+}
+
+log_info() {
+    echo "[INFO] $*"
+}
+
 ARCH=$1
 PUSH_IMAGES=${2:-false}
 
 # List of allowed architectures
-ALLOWED_ARCHS=("intel" "vulkan" "musa" "cuda" "cpu")
+ALLOWED_ARCHS=("intel" "vulkan" "musa" "cuda" "cpu" "rocm")
 
 # Check if ARCH is in the allowed list
 if [[ ! " ${ALLOWED_ARCHS[@]} " =~ " ${ARCH} " ]]; then
-  echo "Error: ARCH must be one of the following: ${ALLOWED_ARCHS[@]}"
+  log_info "Error: ARCH must be one of the following: ${ALLOWED_ARCHS[@]}"
   exit 1
 fi
 
 # Check if GITHUB_TOKEN is set and not empty
 if [[ -z "$GITHUB_TOKEN" ]]; then
-  echo "Error: GITHUB_TOKEN is not set or is empty."
+  log_info "Error: GITHUB_TOKEN is not set or is empty."
   exit 1
 fi
 
@@ -32,25 +48,74 @@ LS_REPO=${GITHUB_REPOSITORY:-mostlygeek/llama-swap}
 # have to strip out the 'v' due to .tar.gz file naming
 LS_VER=$(curl -s https://api.github.com/repos/${LS_REPO}/releases/latest | jq -r .tag_name | sed 's/v//')
 
+# Fetches the most recent llama.cpp tag matching the given prefix
+# Handles pagination to search beyond the first 100 results
+# $1 - tag_prefix (e.g., "server" or "server-vulkan")
+# Returns: the version number extracted from the tag
+fetch_llama_tag() {
+    local tag_prefix=$1
+    local page=1
+    local per_page=100
+
+    while true; do
+        log_debug "Fetching page $page for tag prefix: $tag_prefix"
+
+        local response=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
+            "https://api.github.com/users/ggml-org/packages/container/llama.cpp/versions?per_page=${per_page}&page=${page}")
+
+        # Check for API errors
+        if echo "$response" | jq -e '.message' > /dev/null 2>&1; then
+            local error_msg=$(echo "$response" | jq -r '.message')
+            log_info "GitHub API error: $error_msg"
+            return 1
+        fi
+
+        # Check if response is empty array (no more pages)
+        if [ "$(echo "$response" | jq 'length')" -eq 0 ]; then
+            log_debug "No more pages (empty response)"
+            return 1
+        fi
+
+        # Extract matching tag from this page
+        local found_tag=$(echo "$response" | jq -r \
+            ".[] | select(.metadata.container.tags[]? | startswith(\"$tag_prefix\")) | .metadata.container.tags[] | select(startswith(\"$tag_prefix\"))" \
+            | sort -r | head -n1)
+
+        if [ -n "$found_tag" ]; then
+            log_debug "Found tag: $found_tag on page $page"
+            echo "$found_tag" | awk -F '-' '{print $NF}'
+            return 0
+        fi
+
+        page=$((page + 1))
+
+        # Safety limit to prevent infinite loops
+        if [ $page -gt 50 ]; then
+            log_info "Reached pagination safety limit (50 pages)"
+            return 1
+        fi
+    done
+}
+
 if [ "$ARCH" == "cpu" ]; then
-    # cpu only containers just use the server tag
+    LCPP_TAG=$(fetch_llama_tag "server")
-    LCPP_TAG=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
-        "https://api.github.com/users/ggml-org/packages/container/llama.cpp/versions" \
-        | jq -r '.[] | select(.metadata.container.tags[] | startswith("server")) | .metadata.container.tags[]' \
-        | sort -r | head -n1 | awk -F '-' '{print $3}')
     BASE_TAG=server-${LCPP_TAG}
 else
-    LCPP_TAG=$(curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
+    LCPP_TAG=$(fetch_llama_tag "server-${ARCH}")
-        "https://api.github.com/users/ggml-org/packages/container/llama.cpp/versions" \
-        | jq -r --arg arch "$ARCH" '.[] | select(.metadata.container.tags[] | startswith("server-\($arch)")) | .metadata.container.tags[]' \
-        | sort -r | head -n1 | awk -F '-' '{print $3}')
     BASE_TAG=server-${ARCH}-${LCPP_TAG}
 fi
 
 # Abort if LCPP_TAG is empty.
 if [[ -z "$LCPP_TAG" ]]; then
-    echo "Abort: Could not find llama-server container for arch: $ARCH"
+    log_info "Abort: Could not find llama-server container for arch: $ARCH"
     exit 1
+else
+    log_info "LCPP_TAG: $LCPP_TAG"
+fi
+
+if [[ ! -z "$DEBUG_ABORT_BUILD" ]]; then
+    log_info "Abort: DEBUG_ABORT_BUILD set"
+    exit 0
 fi
 
 for CONTAINER_TYPE in non-root root; do
@@ -68,7 +133,7 @@ for CONTAINER_TYPE in non-root root; do
     USER_HOME=/app
   fi
 
-  echo "Building $CONTAINER_TYPE $CONTAINER_TAG $LS_VER"
+  log_info "Building $CONTAINER_TYPE $CONTAINER_TAG $LS_VER"
   docker build -f llama-swap.Containerfile --build-arg BASE_TAG=${BASE_TAG} --build-arg LS_VER=${LS_VER} --build-arg UID=${USER_UID} \
     --build-arg LS_REPO=${LS_REPO} --build-arg GID=${USER_GID} --build-arg USER_HOME=${USER_HOME} -t ${CONTAINER_TAG} -t ${CONTAINER_LATEST} \
     --build-arg BASE_IMAGE=${BASE_IMAGE} .

proxy/config/config.go

@@ -87,6 +87,7 @@ type GroupConfig struct {
 var (
 	macroNameRegex    = regexp.MustCompile(`^[a-zA-Z0-9_-]+$`)
 	macroPatternRegex = regexp.MustCompile(`\$\{([a-zA-Z0-9_-]+)\}`)
+	envMacroRegex     = regexp.MustCompile(`\$\{env\.([a-zA-Z_][a-zA-Z0-9_]*)\}`)
 )
 
 // set default values for GroupConfig
@@ -183,8 +184,16 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 	if err != nil {
 		return Config{}, err
 	}
+	yamlStr := string(data)
 
-	// default configuration values
+	// Phase 1: Substitute all ${env.VAR} macros at string level
+	// This is safe because env values are simple strings without YAML formatting
+	yamlStr, err = substituteEnvMacros(yamlStr)
+	if err != nil {
+		return Config{}, err
+	}
+
+	// Unmarshal into full Config with defaults
 	config := Config{
 		HealthCheckTimeout: 120,
 		StartPort:          5800,
@@ -193,13 +202,11 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 		LogToStdout:        LogToStdoutProxy,
 		MetricsMaxInMemory: 1000,
 	}
-	err = yaml.Unmarshal(data, &config)
+	if err = yaml.Unmarshal([]byte(yamlStr), &config); err != nil {
-	if err != nil {
 		return Config{}, err
 	}
 
 	if config.HealthCheckTimeout < 15 {
-		// set a minimum of 15 seconds
 		config.HealthCheckTimeout = 15
 	}
 
@@ -224,55 +231,46 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 		}
 	}
 
-	/* check macro constraint rules:
+	// Validate global macros
-
-	- name must fit the regex ^[a-zA-Z0-9_-]+$
-	- names must be less than 64 characters (no reason, just cause)
-	- name can not be any reserved macros: PORT, MODEL_ID
-	- macro values must be less than 1024 characters
-	*/
 	for _, macro := range config.Macros {
 		if err = validateMacro(macro.Name, macro.Value); err != nil {
 			return Config{}, err
 		}
 	}
 
-	// Get and sort all model IDs first, makes testing more consistent
+	// Get and sort all model IDs for consistent port assignment
 	modelIds := make([]string, 0, len(config.Models))
 	for modelId := range config.Models {
 		modelIds = append(modelIds, modelId)
 	}
-	sort.Strings(modelIds) // This guarantees stable iteration order
+	sort.Strings(modelIds)
 
 	nextPort := config.StartPort
 	for _, modelId := range modelIds {
 		modelConfig := config.Models[modelId]
 
-		// Strip comments from command fields before macro expansion
+		// Strip comments from command fields
 		modelConfig.Cmd = StripComments(modelConfig.Cmd)
 		modelConfig.CmdStop = StripComments(modelConfig.CmdStop)
 
-		// validate model macros
+		// Validate model macros
 		for _, macro := range modelConfig.Macros {
 			if err = validateMacro(macro.Name, macro.Value); err != nil {
 				return Config{}, fmt.Errorf("model %s: %s", modelId, err.Error())
 			}
 		}
 
-		// Merge global config and model macros. Model macros take precedence
+		// Build merged macro list: MODEL_ID + global macros + model macros (model overrides global)
-		mergedMacros := make(MacroList, 0, len(config.Macros)+len(modelConfig.Macros))
+		mergedMacros := make(MacroList, 0, len(config.Macros)+len(modelConfig.Macros)+1)
 		mergedMacros = append(mergedMacros, MacroEntry{Name: "MODEL_ID", Value: modelId})
-
-		// Add global macros first
 		mergedMacros = append(mergedMacros, config.Macros...)
 
-		// Add model macros (can override global)
+		// Add model macros (override globals with same name)
 		for _, entry := range modelConfig.Macros {
-			// Remove any existing global macro with same name
 			found := false
 			for i, existing := range mergedMacros {
 				if existing.Name == entry.Name {
-					mergedMacros[i] = entry // Override
+					mergedMacros[i] = entry
 					found = true
 					break
 				}
@@ -282,23 +280,20 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 			}
 		}
 
-		// First pass: Substitute user-defined macros in reverse order (LIFO - last defined first)
+		// Substitute remaining macros in model fields (LIFO order)
-		// This allows later macros to reference earlier ones
 		for i := len(mergedMacros) - 1; i >= 0; i-- {
 			entry := mergedMacros[i]
 			macroSlug := fmt.Sprintf("${%s}", entry.Name)
 			macroStr := fmt.Sprintf("%v", entry.Value)
 
-			// Substitute in command fields
 			modelConfig.Cmd = strings.ReplaceAll(modelConfig.Cmd, macroSlug, macroStr)
 			modelConfig.CmdStop = strings.ReplaceAll(modelConfig.CmdStop, macroSlug, macroStr)
 			modelConfig.Proxy = strings.ReplaceAll(modelConfig.Proxy, macroSlug, macroStr)
 			modelConfig.CheckEndpoint = strings.ReplaceAll(modelConfig.CheckEndpoint, macroSlug, macroStr)
 			modelConfig.Filters.StripParams = strings.ReplaceAll(modelConfig.Filters.StripParams, macroSlug, macroStr)
 
-			// Substitute in metadata (recursive)
+			// Substitute in metadata (type-preserving)
 			if len(modelConfig.Metadata) > 0 {
-				var err error
 				result, err := substituteMacroInValue(modelConfig.Metadata, entry.Name, entry.Value)
 				if err != nil {
 					return Config{}, fmt.Errorf("model %s metadata: %s", modelId, err.Error())
@@ -307,18 +302,14 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 			}
 		}
 
-		// Final pass: check if PORT macro is needed after macro expansion
+		// Handle PORT macro - only allocate if cmd uses it
-		// ${PORT} is a resource on the local machine so a new port is only allocated
-		// if it is required in either cmd or proxy keys
 		cmdHasPort := strings.Contains(modelConfig.Cmd, "${PORT}")
 		proxyHasPort := strings.Contains(modelConfig.Proxy, "${PORT}")
-		if cmdHasPort || proxyHasPort { // either has it
+		if cmdHasPort || proxyHasPort {
-			if !cmdHasPort && proxyHasPort { // but both don't have it
+			if !cmdHasPort && proxyHasPort {
 				return Config{}, fmt.Errorf("model %s: proxy uses ${PORT} but cmd does not - ${PORT} is only available when used in cmd", modelId)
 			}
 
-			// Add PORT macro and substitute it
-			portEntry := MacroEntry{Name: "PORT", Value: nextPort}
 			macroSlug := "${PORT}"
 			macroStr := fmt.Sprintf("%v", nextPort)
 
@@ -326,10 +317,8 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 			modelConfig.CmdStop = strings.ReplaceAll(modelConfig.CmdStop, macroSlug, macroStr)
 			modelConfig.Proxy = strings.ReplaceAll(modelConfig.Proxy, macroSlug, macroStr)
 
-			// Substitute PORT in metadata
 			if len(modelConfig.Metadata) > 0 {
-				var err error
+				result, err := substituteMacroInValue(modelConfig.Metadata, "PORT", nextPort)
-				result, err := substituteMacroInValue(modelConfig.Metadata, portEntry.Name, portEntry.Value)
 				if err != nil {
 					return Config{}, fmt.Errorf("model %s metadata: %s", modelId, err.Error())
 				}
@@ -339,7 +328,7 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 			nextPort++
 		}
 
-		// make sure there are no unknown macros that have not been replaced
+		// Validate no unknown macros remain
 		fieldMap := map[string]string{
 			"cmd":                 modelConfig.Cmd,
 			"cmdStop":             modelConfig.CmdStop,
@@ -353,35 +342,27 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 			for _, match := range matches {
 				macroName := match[1]
 				if macroName == "PID" && fieldName == "cmdStop" {
-					continue // this is ok, has to be replaced by process later
+					continue // replaced at runtime
 				}
-				// Reserved macros are always valid (they should have been substituted already)
 				if macroName == "PORT" || macroName == "MODEL_ID" {
 					return Config{}, fmt.Errorf("macro '${%s}' should have been substituted in %s.%s", macroName, modelId, fieldName)
 				}
-				// Any other macro is unknown
 				return Config{}, fmt.Errorf("unknown macro '${%s}' found in %s.%s", macroName, modelId, fieldName)
 			}
 		}
 
-		// Check for unknown macros in metadata
 		if len(modelConfig.Metadata) > 0 {
-			if err := validateMetadataForUnknownMacros(modelConfig.Metadata, modelId); err != nil {
+			if err := validateNestedForUnknownMacros(modelConfig.Metadata, fmt.Sprintf("model %s metadata", modelId)); err != nil {
 				return Config{}, err
 			}
 		}
 
-		// Validate the proxy URL.
 		if _, err := url.Parse(modelConfig.Proxy); err != nil {
-			return Config{}, fmt.Errorf(
+			return Config{}, fmt.Errorf("model %s: invalid proxy URL: %w", modelId, err)
-				"model %s: invalid proxy URL: %w", modelId, err,
-			)
 		}
 
-		// if sendLoadingState is nil, set it to the global config value
-		// see #366
 		if modelConfig.SendLoadingState == nil {
-			v := config.SendLoadingState // copy it
+			v := config.SendLoadingState
 			modelConfig.SendLoadingState = &v
 		}
 
@@ -389,18 +370,17 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 	}
 
 	config = AddDefaultGroupToConfig(config)
-	// check that members are all unique in the groups
+
-	memberUsage := make(map[string]string) // maps member to group it appears in
+	// Validate group members
+	memberUsage := make(map[string]string)
 	for groupID, groupConfig := range config.Groups {
 		prevSet := make(map[string]bool)
 		for _, member := range groupConfig.Members {
-			// Check for duplicates within this group
 			if _, found := prevSet[member]; found {
 				return Config{}, fmt.Errorf("duplicate model member %s found in group: %s", member, groupID)
 			}
 			prevSet[member] = true
 
-			// Check if member is used in another group
 			if existingGroup, exists := memberUsage[member]; exists {
 				return Config{}, fmt.Errorf("model member %s is used in multiple groups: %s and %s", member, existingGroup, groupID)
 			}
@@ -408,7 +388,7 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 		}
 	}
 
-	// clean up hooks preload
+	// Clean up hooks preload
 	if len(config.Hooks.OnStartup.Preload) > 0 {
 		var toPreload []string
 		for _, modelID := range config.Hooks.OnStartup.Preload {
@@ -420,19 +400,54 @@ func LoadConfigFromReader(r io.Reader) (Config, error) {
 				toPreload = append(toPreload, real)
 			}
 		}
-
 		config.Hooks.OnStartup.Preload = toPreload
 	}
 
-	// check api keys validatity
+	// Validate API keys (env macros already substituted at string level)
-	for _, apikey := range config.RequiredAPIKeys {
+	for i, apikey := range config.RequiredAPIKeys {
 		if apikey == "" {
 			return Config{}, fmt.Errorf("empty api key found in apiKeys")
 		}
-
 		if strings.Contains(apikey, " ") {
 			return Config{}, fmt.Errorf("api key cannot contain spaces: `%s`", apikey)
 		}
+		config.RequiredAPIKeys[i] = apikey
+	}
+
+	// Process peers with global macro substitution
+	for peerName, peerConfig := range config.Peers {
+		// Substitute global macros (LIFO order)
+		for i := len(config.Macros) - 1; i >= 0; i-- {
+			entry := config.Macros[i]
+			macroSlug := fmt.Sprintf("${%s}", entry.Name)
+			macroStr := fmt.Sprintf("%v", entry.Value)
+
+			peerConfig.ApiKey = strings.ReplaceAll(peerConfig.ApiKey, macroSlug, macroStr)
+			peerConfig.Filters.StripParams = strings.ReplaceAll(peerConfig.Filters.StripParams, macroSlug, macroStr)
+
+			// Substitute in setParams (type-preserving)
+			if len(peerConfig.Filters.SetParams) > 0 {
+				result, err := substituteMacroInValue(peerConfig.Filters.SetParams, entry.Name, entry.Value)
+				if err != nil {
+					return Config{}, fmt.Errorf("peers.%s.filters.setParams: %w", peerName, err)
+				}
+				peerConfig.Filters.SetParams = result.(map[string]any)
+			}
+		}
+
+		// Validate no unknown macros remain
+		if matches := macroPatternRegex.FindAllStringSubmatch(peerConfig.ApiKey, -1); len(matches) > 0 {
+			return Config{}, fmt.Errorf("peers.%s.apiKey: unknown macro '${%s}'", peerName, matches[0][1])
+		}
+		if matches := macroPatternRegex.FindAllStringSubmatch(peerConfig.Filters.StripParams, -1); len(matches) > 0 {
+			return Config{}, fmt.Errorf("peers.%s.filters.stripParams: unknown macro '${%s}'", peerName, matches[0][1])
+		}
+		if len(peerConfig.Filters.SetParams) > 0 {
+			if err := validateNestedForUnknownMacros(peerConfig.Filters.SetParams, fmt.Sprintf("peers.%s.filters.setParams", peerName)); err != nil {
+				return Config{}, err
+			}
+		}
+		config.Peers[peerName] = peerConfig
 	}
 
 	return config, nil
@@ -565,20 +580,26 @@ func validateMacro(name string, value any) error {
 	return nil
 }
 
-// validateMetadataForUnknownMacros recursively checks for any remaining macro references in metadata
+// validateNestedForUnknownMacros recursively checks for any remaining macro references in nested structures
-func validateMetadataForUnknownMacros(value any, modelId string) error {
+func validateNestedForUnknownMacros(value any, context string) error {
 	switch v := value.(type) {
 	case string:
 		matches := macroPatternRegex.FindAllStringSubmatch(v, -1)
 		for _, match := range matches {
 			macroName := match[1]
-			return fmt.Errorf("model %s metadata: unknown macro '${%s}'", modelId, macroName)
+			return fmt.Errorf("%s: unknown macro '${%s}'", context, macroName)
+		}
+		// Check for unsubstituted env macros
+		envMatches := envMacroRegex.FindAllStringSubmatch(v, -1)
+		for _, match := range envMatches {
+			varName := match[1]
+			return fmt.Errorf("%s: environment variable '%s' not set", context, varName)
 		}
 		return nil
 
 	case map[string]any:
 		for _, val := range v {
-			if err := validateMetadataForUnknownMacros(val, modelId); err != nil {
+			if err := validateNestedForUnknownMacros(val, context); err != nil {
 				return err
 			}
 		}
@@ -586,7 +607,7 @@ func validateMetadataForUnknownMacros(value any, modelId string) error {
 
 	case []any:
 		for _, val := range v {
-			if err := validateMetadataForUnknownMacros(val, modelId); err != nil {
+			if err := validateNestedForUnknownMacros(val, context); err != nil {
 				return err
 			}
 		}
@@ -645,3 +666,46 @@ func substituteMacroInValue(value any, macroName string, macroValue any) (any, e
 		return value, nil
 	}
 }
+
+// substituteEnvMacros replaces ${env.VAR_NAME} with environment variable values
+// Returns error if any env var is not set or contains invalid characters
+func substituteEnvMacros(s string) (string, error) {
+	result := s
+	matches := envMacroRegex.FindAllStringSubmatch(s, -1)
+	for _, match := range matches {
+		fullMatch := match[0] // ${env.VAR_NAME}
+		varName := match[1]   // VAR_NAME
+
+		value, exists := os.LookupEnv(varName)
+		if !exists {
+			return "", fmt.Errorf("environment variable '%s' is not set", varName)
+		}
+
+		// Sanitize the value for safe YAML substitution
+		value, err := sanitizeEnvValueForYAML(value, varName)
+		if err != nil {
+			return "", err
+		}
+
+		result = strings.ReplaceAll(result, fullMatch, value)
+	}
+	return result, nil
+}
+
+// sanitizeEnvValueForYAML ensures an environment variable value is safe for YAML substitution.
+// It rejects values with characters that break YAML structure and escapes quotes/backslashes
+// for compatibility with double-quoted YAML strings.
+func sanitizeEnvValueForYAML(value, varName string) (string, error) {
+	// Reject values that would break YAML structure regardless of quoting context
+	if strings.ContainsAny(value, "\n\r\x00") {
+		return "", fmt.Errorf("environment variable '%s' contains newlines or null bytes which are not allowed in YAML substitution", varName)
+	}
+
+	// Escape backslashes and double quotes for safe use in double-quoted YAML strings.
+	// In unquoted contexts, these escapes appear literally (harmless for most use cases).
+	// In double-quoted contexts, they are interpreted correctly.
+	value = strings.ReplaceAll(value, `\`, `\\`)
+	value = strings.ReplaceAll(value, `"`, `\"`)
+
+	return value, nil
+}

proxy/config/config_test.go

@@ -809,3 +809,503 @@ func TestConfig_APIKeys_Invalid(t *testing.T) {
 		})
 	}
 }
+
+func TestConfig_APIKeys_EnvMacros(t *testing.T) {
+	t.Run("env substitution in apiKeys", func(t *testing.T) {
+		t.Setenv("TEST_API_KEY", "secret-key-123")
+
+		content := `apiKeys: ["${env.TEST_API_KEY}"]`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, []string{"secret-key-123"}, config.RequiredAPIKeys)
+	})
+
+	t.Run("multiple env substitutions in apiKeys", func(t *testing.T) {
+		t.Setenv("TEST_API_KEY_1", "key-one")
+		t.Setenv("TEST_API_KEY_2", "key-two")
+
+		content := `apiKeys: ["${env.TEST_API_KEY_1}", "${env.TEST_API_KEY_2}", "static-key"]`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, []string{"key-one", "key-two", "static-key"}, config.RequiredAPIKeys)
+	})
+
+	t.Run("missing env var in apiKeys", func(t *testing.T) {
+		content := `apiKeys: ["${env.NONEXISTENT_API_KEY}"]`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.Error(t, err)
+		// With string-level env substitution, error only includes var name
+		assert.Contains(t, err.Error(), "NONEXISTENT_API_KEY")
+	})
+
+	t.Run("env substitution results in empty key", func(t *testing.T) {
+		t.Setenv("TEST_EMPTY_KEY", "")
+
+		content := `apiKeys: ["${env.TEST_EMPTY_KEY}"]`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.Error(t, err)
+		assert.Equal(t, "empty api key found in apiKeys", err.Error())
+	})
+}
+
+func TestConfig_EnvMacros(t *testing.T) {
+	t.Run("basic env substitution in cmd", func(t *testing.T) {
+		t.Setenv("TEST_MODEL_PATH", "/opt/models")
+
+		content := `
+models:
+  test:
+    cmd: "${env.TEST_MODEL_PATH}/llama-server"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "/opt/models/llama-server", config.Models["test"].Cmd)
+	})
+
+	t.Run("env substitution in multiple fields", func(t *testing.T) {
+		t.Setenv("TEST_HOST", "myserver")
+		t.Setenv("TEST_PORT", "9999")
+
+		content := `
+models:
+  test:
+    cmd: "server --host ${env.TEST_HOST}"
+    proxy: "http://${env.TEST_HOST}:${env.TEST_PORT}"
+    checkEndpoint: "http://${env.TEST_HOST}/health"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "server --host myserver", config.Models["test"].Cmd)
+		assert.Equal(t, "http://myserver:9999", config.Models["test"].Proxy)
+		assert.Equal(t, "http://myserver/health", config.Models["test"].CheckEndpoint)
+	})
+
+	t.Run("env in global macro value", func(t *testing.T) {
+		t.Setenv("TEST_BASE_PATH", "/usr/local")
+
+		content := `
+macros:
+  SERVER_PATH: "${env.TEST_BASE_PATH}/bin/server"
+models:
+  test:
+    cmd: "${SERVER_PATH} --port 8080"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "/usr/local/bin/server --port 8080", config.Models["test"].Cmd)
+	})
+
+	t.Run("env in model-level macro value", func(t *testing.T) {
+		t.Setenv("TEST_MODEL_DIR", "/models/llama")
+
+		content := `
+models:
+  test:
+    macros:
+      MODEL_FILE: "${env.TEST_MODEL_DIR}/model.gguf"
+    cmd: "server --model ${MODEL_FILE}"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "server --model /models/llama/model.gguf", config.Models["test"].Cmd)
+	})
+
+	t.Run("env in metadata", func(t *testing.T) {
+		t.Setenv("TEST_API_KEY", "secret123")
+
+		content := `
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+    metadata:
+      api_key: "${env.TEST_API_KEY}"
+      nested:
+        key: "${env.TEST_API_KEY}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "secret123", config.Models["test"].Metadata["api_key"])
+		nested := config.Models["test"].Metadata["nested"].(map[string]any)
+		assert.Equal(t, "secret123", nested["key"])
+	})
+
+	t.Run("env in filters.stripParams", func(t *testing.T) {
+		t.Setenv("TEST_STRIP_PARAMS", "temperature,top_p")
+
+		content := `
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+    filters:
+      stripParams: "${env.TEST_STRIP_PARAMS}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "temperature,top_p", config.Models["test"].Filters.StripParams)
+	})
+
+	t.Run("env in cmdStop", func(t *testing.T) {
+		t.Setenv("TEST_KILL_SIGNAL", "SIGTERM")
+
+		content := `
+models:
+  test:
+    cmd: "server --port ${PORT}"
+    cmdStop: "kill -${env.TEST_KILL_SIGNAL} ${PID}"
+    proxy: "http://localhost:${PORT}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Contains(t, config.Models["test"].CmdStop, "-SIGTERM")
+	})
+
+	t.Run("missing env var returns error", func(t *testing.T) {
+		content := `
+models:
+  test:
+    cmd: "${env.UNDEFINED_VAR_12345}/server"
+    proxy: "http://localhost:8080"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		if assert.Error(t, err) {
+			assert.Contains(t, err.Error(), "UNDEFINED_VAR_12345")
+			assert.Contains(t, err.Error(), "not set")
+		}
+	})
+
+	t.Run("missing env var in global macro", func(t *testing.T) {
+		content := `
+macros:
+  PATH: "${env.UNDEFINED_GLOBAL_VAR}"
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		if assert.Error(t, err) {
+			assert.Contains(t, err.Error(), "UNDEFINED_GLOBAL_VAR")
+			assert.Contains(t, err.Error(), "not set")
+		}
+	})
+
+	t.Run("missing env var in model macro", func(t *testing.T) {
+		content := `
+models:
+  test:
+    macros:
+      MY_PATH: "${env.UNDEFINED_MODEL_VAR}"
+    cmd: "server"
+    proxy: "http://localhost:8080"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		if assert.Error(t, err) {
+			assert.Contains(t, err.Error(), "UNDEFINED_MODEL_VAR")
+			assert.Contains(t, err.Error(), "not set")
+		}
+	})
+
+	t.Run("missing env var in metadata", func(t *testing.T) {
+		content := `
+models:
+  test:
+    cmd: "server"
+    proxy: "http://localhost:8080"
+    metadata:
+      key: "${env.UNDEFINED_META_VAR}"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		if assert.Error(t, err) {
+			assert.Contains(t, err.Error(), "UNDEFINED_META_VAR")
+			assert.Contains(t, err.Error(), "not set")
+		}
+	})
+
+	t.Run("env combined with regular macros", func(t *testing.T) {
+		t.Setenv("TEST_ROOT", "/data")
+
+		content := `
+macros:
+  MODEL_BASE: "${env.TEST_ROOT}/models"
+models:
+  test:
+    cmd: "server --model ${MODEL_BASE}/${MODEL_ID}.gguf"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "server --model /data/models/test.gguf", config.Models["test"].Cmd)
+	})
+
+	t.Run("multiple env vars in same string", func(t *testing.T) {
+		t.Setenv("TEST_USER", "admin")
+		t.Setenv("TEST_PASS", "secret")
+
+		content := `
+models:
+  test:
+    cmd: "server --auth ${env.TEST_USER}:${env.TEST_PASS}"
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "server --auth admin:secret", config.Models["test"].Cmd)
+	})
+
+	t.Run("env value with newline is rejected", func(t *testing.T) {
+		t.Setenv("TEST_MULTILINE", "line1\nline2")
+
+		content := `
+models:
+  test:
+    cmd: "server --config ${env.TEST_MULTILINE}"
+    proxy: "http://localhost:8080"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		if assert.Error(t, err) {
+			assert.Contains(t, err.Error(), "TEST_MULTILINE")
+			assert.Contains(t, err.Error(), "newlines")
+		}
+	})
+
+	t.Run("env value with carriage return is rejected", func(t *testing.T) {
+		t.Setenv("TEST_CR", "line1\rline2")
+
+		content := `
+models:
+  test:
+    cmd: "server --config ${env.TEST_CR}"
+    proxy: "http://localhost:8080"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		if assert.Error(t, err) {
+			assert.Contains(t, err.Error(), "TEST_CR")
+			assert.Contains(t, err.Error(), "newlines")
+		}
+	})
+
+	t.Run("env value with quotes is escaped for YAML", func(t *testing.T) {
+		t.Setenv("TEST_QUOTED", `value with "quotes"`)
+
+		content := `
+models:
+  test:
+    cmd: "server --arg \"${env.TEST_QUOTED}\""
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		// Quotes are escaped before YAML parsing, then YAML unescapes them
+		// Final result preserves the original value with quotes
+		assert.Contains(t, config.Models["test"].Cmd, `"quotes"`)
+	})
+
+	t.Run("env value with backslash is escaped for YAML", func(t *testing.T) {
+		t.Setenv("TEST_BACKSLASH", `path\to\file`)
+
+		content := `
+models:
+  test:
+    cmd: "server --path \"${env.TEST_BACKSLASH}\""
+    proxy: "http://localhost:8080"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		// Backslashes are escaped before YAML parsing, then YAML unescapes them
+		// Final result preserves the original value with backslashes
+		assert.Contains(t, config.Models["test"].Cmd, `path\to\file`)
+	})
+}
+
+func TestConfig_PeerApiKey_EnvMacros(t *testing.T) {
+	t.Run("env substitution in peer apiKey", func(t *testing.T) {
+		t.Setenv("TEST_PEER_API_KEY", "sk-peer-secret-123")
+
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    apiKey: "${env.TEST_PEER_API_KEY}"
+    models:
+      - llama-3.1-8b
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "sk-peer-secret-123", config.Peers["openrouter"].ApiKey)
+	})
+
+	t.Run("missing env var in peer apiKey", func(t *testing.T) {
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    apiKey: "${env.NONEXISTENT_PEER_KEY}"
+    models:
+      - llama-3.1-8b
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.Error(t, err)
+		// With string-level env substitution, error only includes var name
+		assert.Contains(t, err.Error(), "NONEXISTENT_PEER_KEY")
+	})
+
+	t.Run("static apiKey unchanged", func(t *testing.T) {
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    apiKey: sk-static-key
+    models:
+      - llama-3.1-8b
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "sk-static-key", config.Peers["openrouter"].ApiKey)
+	})
+
+	t.Run("multiple peers with env apiKeys", func(t *testing.T) {
+		t.Setenv("TEST_PEER_KEY_1", "key-one")
+		t.Setenv("TEST_PEER_KEY_2", "key-two")
+
+		content := `
+peers:
+  peer1:
+    proxy: https://peer1.example.com
+    apiKey: "${env.TEST_PEER_KEY_1}"
+    models:
+      - model-a
+  peer2:
+    proxy: https://peer2.example.com
+    apiKey: "${env.TEST_PEER_KEY_2}"
+    models:
+      - model-b
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "key-one", config.Peers["peer1"].ApiKey)
+		assert.Equal(t, "key-two", config.Peers["peer2"].ApiKey)
+	})
+
+	t.Run("global macro substitution in peer apiKey", func(t *testing.T) {
+		content := `
+macros:
+  API_KEY: sk-from-global-macro
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    apiKey: "${API_KEY}"
+    models:
+      - llama-3.1-8b
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "sk-from-global-macro", config.Peers["openrouter"].ApiKey)
+	})
+
+	t.Run("global macro in peer filters.stripParams", func(t *testing.T) {
+		content := `
+macros:
+  STRIP_LIST: "temperature, top_p"
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    models:
+      - llama-3.1-8b
+    filters:
+      stripParams: "${STRIP_LIST}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "temperature, top_p", config.Peers["openrouter"].Filters.StripParams)
+	})
+
+	t.Run("global macro in peer filters.setParams", func(t *testing.T) {
+		content := `
+macros:
+  MAX_TOKENS: 4096
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    models:
+      - llama-3.1-8b
+    filters:
+      setParams:
+        max_tokens: "${MAX_TOKENS}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, 4096, config.Peers["openrouter"].Filters.SetParams["max_tokens"])
+	})
+
+	t.Run("env macro in peer filters.setParams", func(t *testing.T) {
+		t.Setenv("TEST_RETENTION_POLICY", "deny")
+
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    models:
+      - llama-3.1-8b
+    filters:
+      setParams:
+        data_collection: "${env.TEST_RETENTION_POLICY}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "deny", config.Peers["openrouter"].Filters.SetParams["data_collection"])
+	})
+
+	t.Run("env macro in peer filters.stripParams", func(t *testing.T) {
+		t.Setenv("TEST_STRIP_PARAMS", "frequency_penalty, presence_penalty")
+
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    models:
+      - llama-3.1-8b
+    filters:
+      stripParams: "${env.TEST_STRIP_PARAMS}"
+`
+		config, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.NoError(t, err)
+		assert.Equal(t, "frequency_penalty, presence_penalty", config.Peers["openrouter"].Filters.StripParams)
+	})
+
+	t.Run("unknown macro in peer apiKey fails", func(t *testing.T) {
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    apiKey: "${UNDEFINED_MACRO}"
+    models:
+      - llama-3.1-8b
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "peers.openrouter.apiKey")
+		assert.Contains(t, err.Error(), "unknown macro")
+	})
+
+	t.Run("unknown macro in peer filters.setParams fails", func(t *testing.T) {
+		content := `
+peers:
+  openrouter:
+    proxy: https://openrouter.ai/api
+    models:
+      - llama-3.1-8b
+    filters:
+      setParams:
+        value: "${UNDEFINED_MACRO}"
+`
+		_, err := LoadConfigFromReader(strings.NewReader(content))
+		assert.Error(t, err)
+		assert.Contains(t, err.Error(), "peers.openrouter.filters.setParams")
+		assert.Contains(t, err.Error(), "unknown macro")
+	})
+}

proxy/config/filters.go

@@ -0,0 +1,81 @@
+package config
+
+import (
+	"slices"
+	"sort"
+	"strings"
+)
+
+// ProtectedParams is a list of parameters that cannot be set or stripped via filters
+// These are protected to prevent breaking the proxy's ability to route requests correctly
+var ProtectedParams = []string{"model"}
+
+// Filters contains filter settings for modifying request parameters
+// Used by both models and peers
+type Filters struct {
+	// StripParams is a comma-separated list of parameters to remove from requests
+	// The "model" parameter can never be removed
+	StripParams string `yaml:"stripParams"`
+
+	// SetParams is a dictionary of parameters to set/override in requests
+	// Protected params (like "model") cannot be set
+	SetParams map[string]any `yaml:"setParams"`
+}
+
+// SanitizedStripParams returns a sorted list of parameters to strip,
+// with duplicates, empty strings, and protected params removed
+func (f Filters) SanitizedStripParams() []string {
+	if f.StripParams == "" {
+		return nil
+	}
+
+	params := strings.Split(f.StripParams, ",")
+	cleaned := make([]string, 0, len(params))
+	seen := make(map[string]bool)
+
+	for _, param := range params {
+		trimmed := strings.TrimSpace(param)
+		// Skip protected params, empty strings, and duplicates
+		if slices.Contains(ProtectedParams, trimmed) || trimmed == "" || seen[trimmed] {
+			continue
+		}
+		seen[trimmed] = true
+		cleaned = append(cleaned, trimmed)
+	}
+
+	if len(cleaned) == 0 {
+		return nil
+	}
+
+	slices.Sort(cleaned)
+	return cleaned
+}
+
+// SanitizedSetParams returns a copy of SetParams with protected params removed
+// and keys sorted for consistent iteration order
+func (f Filters) SanitizedSetParams() (map[string]any, []string) {
+	if len(f.SetParams) == 0 {
+		return nil, nil
+	}
+
+	result := make(map[string]any, len(f.SetParams))
+	keys := make([]string, 0, len(f.SetParams))
+
+	for key, value := range f.SetParams {
+		// Skip protected params
+		if slices.Contains(ProtectedParams, key) {
+			continue
+		}
+		result[key] = value
+		keys = append(keys, key)
+	}
+
+	// Sort keys for consistent ordering
+	sort.Strings(keys)
+
+	if len(result) == 0 {
+		return nil, nil
+	}
+
+	return result, keys
+}

proxy/config/filters_test.go

@@ -0,0 +1,168 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFilters_SanitizedStripParams(t *testing.T) {
+	tests := []struct {
+		name        string
+		stripParams string
+		want        []string
+	}{
+		{
+			name:        "empty string",
+			stripParams: "",
+			want:        nil,
+		},
+		{
+			name:        "single param",
+			stripParams: "temperature",
+			want:        []string{"temperature"},
+		},
+		{
+			name:        "multiple params",
+			stripParams: "temperature, top_p, top_k",
+			want:        []string{"temperature", "top_k", "top_p"}, // sorted
+		},
+		{
+			name:        "model param filtered",
+			stripParams: "model, temperature, top_p",
+			want:        []string{"temperature", "top_p"},
+		},
+		{
+			name:        "only model param",
+			stripParams: "model",
+			want:        nil,
+		},
+		{
+			name:        "duplicates removed",
+			stripParams: "temperature, top_p, temperature",
+			want:        []string{"temperature", "top_p"},
+		},
+		{
+			name:        "extra whitespace",
+			stripParams: "  temperature  ,  top_p  ",
+			want:        []string{"temperature", "top_p"},
+		},
+		{
+			name:        "empty values filtered",
+			stripParams: "temperature,,top_p,",
+			want:        []string{"temperature", "top_p"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			f := Filters{StripParams: tt.stripParams}
+			got := f.SanitizedStripParams()
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
+func TestFilters_SanitizedSetParams(t *testing.T) {
+	tests := []struct {
+		name       string
+		setParams  map[string]any
+		wantParams map[string]any
+		wantKeys   []string
+	}{
+		{
+			name:       "empty setParams",
+			setParams:  nil,
+			wantParams: nil,
+			wantKeys:   nil,
+		},
+		{
+			name:       "empty map",
+			setParams:  map[string]any{},
+			wantParams: nil,
+			wantKeys:   nil,
+		},
+		{
+			name: "normal params",
+			setParams: map[string]any{
+				"temperature": 0.7,
+				"top_p":       0.9,
+			},
+			wantParams: map[string]any{
+				"temperature": 0.7,
+				"top_p":       0.9,
+			},
+			wantKeys: []string{"temperature", "top_p"},
+		},
+		{
+			name: "protected model param filtered",
+			setParams: map[string]any{
+				"model":       "should-be-filtered",
+				"temperature": 0.7,
+			},
+			wantParams: map[string]any{
+				"temperature": 0.7,
+			},
+			wantKeys: []string{"temperature"},
+		},
+		{
+			name: "only protected param",
+			setParams: map[string]any{
+				"model": "should-be-filtered",
+			},
+			wantParams: nil,
+			wantKeys:   nil,
+		},
+		{
+			name: "complex nested values",
+			setParams: map[string]any{
+				"provider": map[string]any{
+					"data_collection": "deny",
+					"allow_fallbacks": false,
+				},
+				"transforms": []string{"middle-out"},
+			},
+			wantParams: map[string]any{
+				"provider": map[string]any{
+					"data_collection": "deny",
+					"allow_fallbacks": false,
+				},
+				"transforms": []string{"middle-out"},
+			},
+			wantKeys: []string{"provider", "transforms"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			f := Filters{SetParams: tt.setParams}
+			gotParams, gotKeys := f.SanitizedSetParams()
+
+			assert.Equal(t, len(tt.wantKeys), len(gotKeys), "keys length mismatch")
+			for i, key := range gotKeys {
+				assert.Equal(t, tt.wantKeys[i], key, "key mismatch at %d", i)
+			}
+
+			if tt.wantParams == nil {
+				assert.Nil(t, gotParams, "expected nil params")
+				return
+			}
+
+			assert.Equal(t, len(tt.wantParams), len(gotParams), "params length mismatch")
+			for key, wantValue := range tt.wantParams {
+				gotValue, exists := gotParams[key]
+				assert.True(t, exists, "missing key: %s", key)
+				// Simple comparison for basic types
+				switch v := wantValue.(type) {
+				case string, int, float64, bool:
+					assert.Equal(t, v, gotValue, "value mismatch for key %s", key)
+				}
+			}
+		})
+	}
+}
+
+func TestProtectedParams(t *testing.T) {
+	// Verify that "model" is protected
+	assert.Contains(t, ProtectedParams, "model")
+}

proxy/config/model_config.go

@@ -3,8 +3,6 @@ package config
 import (
 	"errors"
 	"runtime"
-	"slices"
-	"strings"
 )
 
 type ModelConfig struct {
@@ -74,16 +72,15 @@ func (m *ModelConfig) SanitizedCommand() ([]string, error) {
 	return SanitizeCommand(m.Cmd)
 }
 
-// ModelFilters see issue #174
+// ModelFilters embeds Filters and adds legacy support for strip_params field
+// See issue #174
 type ModelFilters struct {
-	StripParams string `yaml:"stripParams"`
+	Filters `yaml:",inline"`
 }
 
 func (m *ModelFilters) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	type rawModelFilters ModelFilters
-	defaults := rawModelFilters{
+	defaults := rawModelFilters{}
-		StripParams: "",
-	}
 
 	if err := unmarshal(&defaults); err != nil {
 		return err
@@ -104,25 +101,8 @@ func (m *ModelFilters) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return nil
 }
 
+// SanitizedStripParams wraps Filters.SanitizedStripParams for backwards compatibility
+// Returns ([]string, error) to match existing API
 func (f ModelFilters) SanitizedStripParams() ([]string, error) {
-	if f.StripParams == "" {
+	return f.Filters.SanitizedStripParams(), nil
-		return nil, nil
-	}
-
-	params := strings.Split(f.StripParams, ",")
-	cleaned := make([]string, 0, len(params))
-	seen := make(map[string]bool)
-
-	for _, param := range params {
-		trimmed := strings.TrimSpace(param)
-		if trimmed == "model" || trimmed == "" || seen[trimmed] {
-			continue
-		}
-		seen[trimmed] = true
-		cleaned = append(cleaned, trimmed)
-	}
-
-	// sort cleaned
-	slices.Sort(cleaned)
-	return cleaned, nil
 }

proxy/config/model_config_test.go

@@ -72,3 +72,35 @@ models:
 		assert.True(t, *config.Models["model2"].SendLoadingState)
 	}
 }
+
+func TestConfig_ModelFiltersWithSetParams(t *testing.T) {
+	content := `
+models:
+  model1:
+    cmd: path/to/cmd --port ${PORT}
+    filters:
+      stripParams: "top_k"
+      setParams:
+        temperature: 0.7
+        top_p: 0.9
+        stop:
+          - "<|end|>"
+          - "<|stop|>"
+`
+	config, err := LoadConfigFromReader(strings.NewReader(content))
+	assert.NoError(t, err)
+
+	modelConfig := config.Models["model1"]
+
+	// Check stripParams
+	stripParams, err := modelConfig.Filters.SanitizedStripParams()
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"top_k"}, stripParams)
+
+	// Check setParams
+	setParams, keys := modelConfig.Filters.SanitizedSetParams()
+	assert.NotNil(t, setParams)
+	assert.Equal(t, []string{"stop", "temperature", "top_p"}, keys)
+	assert.Equal(t, 0.7, setParams["temperature"])
+	assert.Equal(t, 0.9, setParams["top_p"])
+}

proxy/config/peer.go

@@ -11,6 +11,7 @@ type PeerConfig struct {
 	ProxyURL *url.URL `yaml:"-"`
 	ApiKey   string   `yaml:"apiKey"`
 	Models   []string `yaml:"models"`
+	Filters  Filters  `yaml:"filters"`
 }
 
 func (c *PeerConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
@@ -19,6 +20,7 @@ func (c *PeerConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		Proxy:   "",
 		ApiKey:  "",
 		Models:  []string{},
+		Filters: Filters{},
 	}
 
 	if err := unmarshal(&defaults); err != nil {

proxy/config/peer_test.go

@@ -137,3 +137,73 @@ func searchSubstring(s, substr string) bool {
 	}
 	return false
 }
+
+func TestPeerConfig_WithFilters(t *testing.T) {
+	yamlData := `
+proxy: https://openrouter.ai/api
+apiKey: sk-test
+models:
+  - model_a
+filters:
+  setParams:
+    temperature: 0.7
+    provider:
+      data_collection: deny
+`
+	var config PeerConfig
+	err := yaml.Unmarshal([]byte(yamlData), &config)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if config.Filters.SetParams == nil {
+		t.Fatal("Filters.SetParams should not be nil")
+	}
+
+	if config.Filters.SetParams["temperature"] != 0.7 {
+		t.Errorf("expected temperature 0.7, got %v", config.Filters.SetParams["temperature"])
+	}
+
+	provider, ok := config.Filters.SetParams["provider"].(map[string]any)
+	if !ok {
+		t.Fatal("provider should be a map")
+	}
+	if provider["data_collection"] != "deny" {
+		t.Errorf("expected data_collection deny, got %v", provider["data_collection"])
+	}
+}
+
+func TestPeerConfig_WithBothFilters(t *testing.T) {
+	yamlData := `
+proxy: https://openrouter.ai/api
+apiKey: sk-test
+models:
+  - model_a
+filters:
+  stripParams: "temperature, top_p"
+  setParams:
+    max_tokens: 1000
+`
+	var config PeerConfig
+	err := yaml.Unmarshal([]byte(yamlData), &config)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Check stripParams
+	stripParams := config.Filters.SanitizedStripParams()
+	if len(stripParams) != 2 {
+		t.Errorf("expected 2 strip params, got %d", len(stripParams))
+	}
+	if stripParams[0] != "temperature" || stripParams[1] != "top_p" {
+		t.Errorf("unexpected strip params: %v", stripParams)
+	}
+
+	// Check setParams
+	if config.Filters.SetParams == nil {
+		t.Fatal("Filters.SetParams should not be nil")
+	}
+	if config.Filters.SetParams["max_tokens"] != 1000 {
+		t.Errorf("expected max_tokens 1000, got %v", config.Filters.SetParams["max_tokens"])
+	}
+}

proxy/peerproxy.go

@@ -106,6 +106,20 @@ func (p *PeerProxy) HasPeerModel(modelID string) bool {
 	return found
 }
 
+// GetPeerFilters returns the filters for a peer model, or empty filters if not found
+func (p *PeerProxy) GetPeerFilters(modelID string) config.Filters {
+	pp, found := p.proxyMap[modelID]
+	if !found {
+		return config.Filters{}
+	}
+	// Get the peer config using the peerID
+	peer, found := p.peers[pp.peerID]
+	if !found {
+		return config.Filters{}
+	}
+	return peer.Filters
+}
+
 func (p *PeerProxy) ListPeers() config.PeerDictionaryConfig {
 	return p.peers
 }

proxy/proxymanager.go

@@ -282,6 +282,8 @@ func (pm *ProxyManager) setupGinEngine() {
 	pm.ginEngine.POST("/v1/completions", pm.apiKeyAuth(), pm.proxyInferenceHandler)
 	// Support anthropic /v1/messages (added https://github.com/ggml-org/llama.cpp/pull/17570)
 	pm.ginEngine.POST("/v1/messages", pm.apiKeyAuth(), pm.proxyInferenceHandler)
+	// Support anthropic count_tokens API (Also added in the above PR)
+	pm.ginEngine.POST("/v1/messages/count_tokens", pm.apiKeyAuth(), pm.proxyInferenceHandler)
 
 	// Support embeddings and reranking
 	pm.ginEngine.POST("/v1/embeddings", pm.apiKeyAuth(), pm.proxyInferenceHandler)
@@ -650,13 +652,49 @@ func (pm *ProxyManager) proxyInferenceHandler(c *gin.Context) {
 			}
 		}
 
+		// issue #453 set/override parameters in the JSON body
+		setParams, setParamKeys := pm.config.Models[modelID].Filters.SanitizedSetParams()
+		for _, key := range setParamKeys {
+			pm.proxyLogger.Debugf("<%s> setting param: %s", modelID, key)
+			bodyBytes, err = sjson.SetBytes(bodyBytes, key, setParams[key])
+			if err != nil {
+				pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error setting parameter %s in request", key))
+				return
+			}
+		}
+
 		pm.proxyLogger.Debugf("ProxyManager using local Process for model: %s", requestedModel)
 		nextHandler = processGroup.ProxyRequest
 	} else if pm.peerProxy != nil && pm.peerProxy.HasPeerModel(requestedModel) {
 		pm.proxyLogger.Debugf("ProxyManager using ProxyPeer for model: %s", requestedModel)
 		modelID = requestedModel
-		nextHandler = pm.peerProxy.ProxyRequest
 
+		// issue #453 apply filters for peer requests
+		peerFilters := pm.peerProxy.GetPeerFilters(requestedModel)
+
+		// Apply stripParams - remove specified parameters from request
+		stripParams := peerFilters.SanitizedStripParams()
+		for _, param := range stripParams {
+			pm.proxyLogger.Debugf("<%s> stripping param: %s", requestedModel, param)
+			bodyBytes, err = sjson.DeleteBytes(bodyBytes, param)
+			if err != nil {
+				pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error stripping parameter %s from request", param))
+				return
+			}
+		}
+
+		// Apply setParams - set/override specified parameters in request
+		setParams, setParamKeys := peerFilters.SanitizedSetParams()
+		for _, key := range setParamKeys {
+			pm.proxyLogger.Debugf("<%s> setting param: %s", requestedModel, key)
+			bodyBytes, err = sjson.SetBytes(bodyBytes, key, setParams[key])
+			if err != nil {
+				pm.sendErrorResponse(c, http.StatusInternalServerError, fmt.Sprintf("error setting parameter %s in request", key))
+				return
+			}
+		}
+
+		nextHandler = pm.peerProxy.ProxyRequest
 	}
 
 	if nextHandler == nil {
@@ -894,6 +932,11 @@ func (pm *ProxyManager) listRunningProcessesHandler(context *gin.Context) {
 				runningProcesses = append(runningProcesses, gin.H{
 					"model":       process.ID,
 					"state":       process.state,
+					"cmd":         process.config.Cmd,
+					"proxy":       process.config.Proxy,
+					"ttl":         process.config.UnloadAfter,
+					"name":        process.config.Name,
+					"description": process.config.Description,
 				})
 			}
 		}

proxy/proxymanager_test.go

@@ -674,6 +674,11 @@ func TestProxyManager_RunningEndpoint(t *testing.T) {
 		Running []struct {
 			Model       string `json:"model"`
 			State       string `json:"state"`
+			Cmd         string `json:"cmd"`
+			Proxy       string `json:"proxy"`
+			TTL         int    `json:"ttl"`
+			Name        string `json:"name"`
+			Description string `json:"description"`
 		} `json:"running"`
 	}
 
@@ -721,6 +726,11 @@ func TestProxyManager_RunningEndpoint(t *testing.T) {
 
 		// Is the model loaded?
 		assert.Equal(t, "ready", response.Running[0].State)
+
+		// Verify extended fields are present
+		assert.NotEmpty(t, response.Running[0].Cmd, "cmd should be populated")
+		assert.NotEmpty(t, response.Running[0].Proxy, "proxy should be populated")
+		assert.Equal(t, 0, response.Running[0].TTL, "ttl should default to 0")
 	})
 }
 
@@ -966,7 +976,9 @@ func TestProxyManager_ChatContentLength(t *testing.T) {
 func TestProxyManager_FiltersStripParams(t *testing.T) {
 	modelConfig := getTestSimpleResponderConfig("model1")
 	modelConfig.Filters = config.ModelFilters{
+		Filters: config.Filters{
 			StripParams: "temperature, model, stream",
+		},
 	}
 
 	config := config.AddDefaultGroupToConfig(config.Config{

ui/package-lock.json

@@ -75,6 +75,7 @@
       "integrity": "sha512-bXYxrXFubeYdvB0NhD/NBB3Qi6aZeV20GOWVI47t2dkecCEoneR4NPVcb7abpXDEvejgrUfFtG6vG/zxAKmg+g==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@ampproject/remapping": "^2.2.0",
         "@babel/code-frame": "^7.27.1",
@@ -1593,6 +1594,66 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/@tailwindcss/oxide-wasm32-wasi/node_modules/@emnapi/core": {
+      "version": "1.4.3",
+      "dev": true,
+      "inBundle": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@emnapi/wasi-threads": "1.0.2",
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-wasm32-wasi/node_modules/@emnapi/runtime": {
+      "version": "1.4.3",
+      "dev": true,
+      "inBundle": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-wasm32-wasi/node_modules/@emnapi/wasi-threads": {
+      "version": "1.0.2",
+      "dev": true,
+      "inBundle": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
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