test(media): match the overflow placeholder by const, not substring (gadfly #8)

ragnaros/qwen3.6-27b noted TestNormalizeOverCount matched 'omitted' by substring;
the test is in-package, so assert == imageOverflowPlaceholder instead — robust to
wording changes. No behavior change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -79,12 +79,13 @@ alias   := bare token (no slash), expands INLINE, recursively, cycle-checked
 `LLM_<NAME>=scheme://[token@]host[/path]` — e.g.
 `LLM_M5=foreman://token@foreman-m5.example` defines provider `m5`; then
 `m5/qwen3:30b` works in Parse, chains, and aliases. Scheme ∈ {foreman,
-ollama, ollama-cloud, openai, anthropic, google, gemini, llama-swap} ∪
-RegisterScheme. Token = credential; base URL = `https://host` always —
-**except `llama-swap`, which builds `http://host` (local-first; ADR-0015).**
-`New()` scans the process env eagerly; unknown names also resolve lazily at
-Parse time (`my-prov` → `LLM_MY_PROV`). Malformed entries fail on use, not at
-startup.
+ollama, ollama-cloud, openai, anthropic, google, gemini, llama-swap,
+llama-swaps} ∪ RegisterScheme. Token = credential; base URL = `https://host`
+always — **except `llama-swap`, which builds `http://host` (local-first);
+`llama-swaps` is its TLS twin (`https://host`), mirroring redis/rediss
+(ADR-0015).** `New()` scans the process env eagerly; unknown names also resolve
+lazily at Parse time (`my-prov` → `LLM_MY_PROV`). Malformed entries fail on use,
+not at startup.
 
 ## Health & failover (ADR-0006, ADR-0008)
 

README.md

@@ -159,15 +159,17 @@ m, _ := reg.Parse("m5/qwen3:30b,m1/qwen3:30b,thinking")
 ```
 
 DSN format: `scheme://[token@]host[/path]`, scheme ∈ `foreman`, `ollama`,
-`ollama-cloud`, `openai`, `anthropic`, `google`/`gemini`, `llama-swap`, or any
-scheme you add with `RegisterScheme`. The token is the credential (bearer token
-/ API key); the base URL is always `https://host[/path]` — except `llama-swap`,
-which builds `http://host[:port]` since it's local-first. `New()` loads `LLM_*`
-vars eagerly; unknown provider names also resolve lazily at Parse time
-(`my-prov/x` → `LLM_MY_PROV`).
+`ollama-cloud`, `openai`, `anthropic`, `google`/`gemini`, `llama-swap`,
+`llama-swaps`, or any scheme you add with `RegisterScheme`. The token is the
+credential (bearer token / API key); the base URL is always `https://host[/path]`
+— except `llama-swap`, which builds `http://host[:port]` since it's local-first
+(`llama-swaps` is the TLS twin → `https://host`, mirroring redis/rediss). `New()`
+loads `LLM_*` vars eagerly; unknown provider names also resolve lazily at Parse
+time (`my-prov/x` → `LLM_MY_PROV`).
 
 ```
-LLM_LS=llama-swap://token@box.local:8080   # then "ls/qwen3:14b" parses
+LLM_LS=llama-swap://token@box.local:8080    # http  → "ls/qwen3:14b" parses
+LLM_LS=llama-swaps://token@swap.example.com # https → TLS-fronted instance
 ```
 
 [llama-swap](https://github.com/mostlygeek/llama-swap) is a model-swapping proxy

builtin.go

@@ -20,6 +20,12 @@ const (
 	ProviderOllamaCloud = "ollama-cloud"
 	ProviderForeman     = "foreman"
 	ProviderLlamaSwap   = "llama-swap"
+	// ProviderLlamaSwapTLS is the DSN scheme for a TLS-fronted llama-swap
+	// (https base URL). It is a scheme only, not a default built-in provider
+	// name. Why a separate scheme rather than auto-detecting: a DSN carries no
+	// reliable signal for http vs https, so the choice is explicit
+	// (llama-swap = http local-first, llama-swaps = https), mirroring rediss.
+	ProviderLlamaSwapTLS = "llama-swaps"
 )
 
 // registerBuiltins installs the built-in providers and env-DSN scheme
@@ -70,24 +76,28 @@ func registerBuiltins(r *Registry, httpClient *http.Client) {
 
 	// llama-swap: OpenAI-compatible chat + image generation + management
 	// endpoints over a model-swapping proxy. Chat reuses the openai client
-	// (provider/llamaswap delegates); the DSN builds an http:// base URL
-	// because llama-swap is local-first (TLS-fronted instances can use the
-	// openai:// scheme for chat). The no-DSN built-in errors on use with a
-	// clear message, mirroring foreman.
+	// (provider/llamaswap delegates). Two schemes: "llama-swap" builds an
+	// http:// base URL (local-first default), "llama-swaps" builds https://
+	// for a TLS-fronted instance (mirrors redis/rediss). The no-DSN built-in
+	// errors on use with a clear message, mirroring foreman.
 	llamaSwapOpts := func(extra ...llamaswap.Option) []llamaswap.Option {
 		if httpClient != nil {
 			extra = append(extra, llamaswap.WithHTTPClient(httpClient))
 		}
 		return extra
 	}
-	r.providers[ProviderLlamaSwap] = llamaswap.New(llamaSwapOpts(llamaswap.WithName(ProviderLlamaSwap))...)
-	r.schemes[ProviderLlamaSwap] = func(name string, dsn DSN) (llm.Provider, error) {
-		return llamaswap.New(llamaSwapOpts(
-			llamaswap.WithName(name),
-			llamaswap.WithBaseURL("http://"+dsn.Host),
-			llamaswap.WithToken(dsn.Token),
-		)...), nil
+	llamaSwapScheme := func(urlScheme string) SchemeFactory {
+		return func(name string, dsn DSN) (llm.Provider, error) {
+			return llamaswap.New(llamaSwapOpts(
+				llamaswap.WithName(name),
+				llamaswap.WithBaseURL(urlScheme+"://"+dsn.Host),
+				llamaswap.WithToken(dsn.Token),
+			)...), nil
+		}
 	}
+	r.providers[ProviderLlamaSwap] = llamaswap.New(llamaSwapOpts(llamaswap.WithName(ProviderLlamaSwap))...)
+	r.schemes[ProviderLlamaSwap] = llamaSwapScheme("http")
+	r.schemes[ProviderLlamaSwapTLS] = llamaSwapScheme("https")
 
 	// Anthropic and Anthropic-compatible endpoints.
 	anthropicOpts := func(extra ...anthropic.Option) []anthropic.Option {

builtin_llamaswap_test.go

@@ -51,6 +51,28 @@ func TestLlamaSwapScheme(t *testing.T) {
 	}
 }
 
+// TestLlamaSwapsScheme: the "llama-swaps" scheme builds an https base URL for a
+// TLS-fronted instance (vs "llama-swap" which is http local-first).
+func TestLlamaSwapsScheme(t *testing.T) {
+	r := newTestRegistry(t)
+	if err := r.LoadEnv(map[string]string{
+		"LLM_LST": "llama-swaps://tok@swap.example.com",
+	}); err != nil {
+		t.Fatalf("LoadEnv: %v", err)
+	}
+	p, ok := r.Provider("lst")
+	if !ok {
+		t.Fatal("provider \"lst\" not registered")
+	}
+	lp, ok := p.(*llamaswap.Provider)
+	if !ok {
+		t.Fatalf("provider is %T, want *llamaswap.Provider", p)
+	}
+	if want := "https://swap.example.com"; lp.BaseURL() != want {
+		t.Errorf("baseURL = %q, want %q", lp.BaseURL(), want)
+	}
+}
+
 // TestLlamaSwapBuiltinNoURL: the no-DSN built-in resolves but errors clearly on
 // use (mirrors foreman), rather than silently hitting a wrong host.
 func TestLlamaSwapBuiltinNoURL(t *testing.T) {

docs/adr/0015-llama-swap-provider.md

@@ -38,11 +38,13 @@ features leak into the canonical API).
   `Unload` (POST `/api/models/unload[/:model]`). A small `doJSON` helper shares
   bearer auth + error mapping; non-2xx → `*llm.APIError` (so `llm.Classify`
   applies), transport errors wrapped raw.
-- DSN: the `llama-swap` scheme builds an **http://** base URL from the host
-  (llama-swap is local-first), deliberately *not* the DSN's https-always
-  `BaseURL()`. A TLS-fronted instance can use the `openai://` scheme for chat.
-  A no-DSN built-in `llama-swap` provider registers but errors on use (mirrors
-  foreman).
+- DSN: two schemes share one factory. `llama-swap` builds an **http://** base
+  URL from the host (llama-swap is local-first), deliberately *not* the DSN's
+  https-always `BaseURL()`; `llama-swaps` builds **https://** for a TLS-fronted
+  instance (mirrors redis/rediss). Why a second scheme rather than auto-detect:
+  a DSN carries no reliable http-vs-https signal, so the choice stays explicit.
+  Only `llama-swap` registers a no-DSN built-in provider (errors on use, mirrors
+  foreman); `llama-swaps` is a scheme only.
 - Image generation is implemented here too, against the new `imagegen`
   interface (see ADR-0016).
 

media/media.go

@@ -5,10 +5,16 @@
 // already satisfies the target's llm.Capabilities. Images that do not fit
 // are decoded, downscaled (never upscaled), and re-encoded into an allowed
 // format and byte budget. Anything that cannot honestly be made to fit —
-// undecodable formats, impossible byte budgets, too many images, images for
-// a text-only target — fails with an error wrapping llm.ErrUnsupported so a
-// failover chain can advance to a more capable target without a health
-// penalty.
+// undecodable formats, impossible byte budgets, images for a text-only
+// target — fails with an error wrapping llm.ErrUnsupported so a failover
+// chain can advance to a more capable target without a health penalty.
+//
+// Over-count is the exception: a request carrying more images than
+// MaxImagesPerReq does NOT fail — the oldest images are replaced with a short
+// text placeholder and the most-recent MaxImagesPerReq are kept, because a hard
+// refuse exhausts a chain whose targets share the same cap (e.g. an agent loop
+// accumulating a preview image per iteration). MaxImagesPerReq remains the
+// per-model knob (0 = no image support).
 //
 // Why a separate package: every provider would otherwise duplicate the same
 // decode/scale/encode pipeline. Providers keep only a cheap capability
@@ -52,15 +58,21 @@ func Normalize(req llm.Request, caps llm.Capabilities) (llm.Request, error) {
 	if !caps.SupportsImages() {
 		return llm.Request{}, fmt.Errorf("media: %w: target does not accept image input (request carries %d image(s))", llm.ErrUnsupported, total)
 	}
-	// Why error instead of dropping the overflow: silently removing an image
-	// changes the question the caller asked; the honest move is to refuse and
-	// let a chain try a roomier target.
+	// Over-cap images are elided in the same copy-on-write pass below: the
+	// OLDEST excess are replaced with a placeholder and the most-recent
+	// MaxImagesPerReq kept (see the package doc for why we elide rather than
+	// refuse). toElide is how many of the first images, front-to-back, to drop.
+	toElide := 0
 	if total > caps.MaxImagesPerReq {
-		return llm.Request{}, fmt.Errorf("media: %w: request carries %d images, target allows at most %d per request", llm.ErrUnsupported, total, caps.MaxImagesPerReq)
+		toElide = total - caps.MaxImagesPerReq
 	}
 
+	// Single copy-on-write pass: for each image, the first toElide become a text
+	// placeholder; the rest are size-normalized against caps. The Messages slice
+	// and an affected message's Parts slice are copied at most once.
 	out := req
 	copiedMessages := false
+	seen := 0
 	for mi := range req.Messages {
 		copiedParts := false
 		for pi, part := range req.Messages[mi].Parts {
@@ -68,13 +80,22 @@ func Normalize(req llm.Request, caps llm.Capabilities) (llm.Request, error) {
 			if !ok {
 				continue
 			}
-			norm, changed, err := normalizeImage(ip, caps)
-			if err != nil {
-				return llm.Request{}, fmt.Errorf("media: message %d, part %d: %w", mi, pi, err)
-			}
-			if !changed {
-				continue
+			seen++
+
+			var replacement llm.Part
+			if seen <= toElide {
+				replacement = llm.Text(imageOverflowPlaceholder)
+			} else {
+				norm, changed, err := normalizeImage(ip, caps)
+				if err != nil {
+					return llm.Request{}, fmt.Errorf("media: message %d, part %d: %w", mi, pi, err)
+				}
+				if !changed {
+					continue
+				}
+				replacement = norm
 			}
+
 			if !copiedMessages {
 				out.Messages = make([]llm.Message, len(req.Messages))
 				copy(out.Messages, req.Messages)
@@ -86,12 +107,17 @@ func Normalize(req llm.Request, caps llm.Capabilities) (llm.Request, error) {
 				out.Messages[mi].Parts = parts
 				copiedParts = true
 			}
-			out.Messages[mi].Parts[pi] = norm
+			out.Messages[mi].Parts[pi] = replacement
 		}
 	}
 	return out, nil
 }
 
+// imageOverflowPlaceholder replaces an image elided to fit a target's
+// per-request image cap. It keeps the message turn intact and tells the model
+// an earlier image was omitted rather than silently changing the conversation.
+const imageOverflowPlaceholder = "[earlier image omitted to fit this model's per-request image limit]"
+
 // Info reports an image part's sniffed format ("jpeg", "png", "gif", or
 // "webp") and pixel dimensions. It is a cheap metadata read — the pixels are
 // never decoded. webp is recognized by signature but not decodable with the

media/media_test.go

@@ -149,18 +149,48 @@ func TestNormalizeImagesUnsupported(t *testing.T) {
 	}
 }
 
-func TestNormalizeTooManyImages(t *testing.T) {
-	img := llm.Image("image/png", encPNG(t, gradient(4, 4)))
+func TestNormalizeOverCount(t *testing.T) {
+	// 3 distinguishable images across 2 messages; cap = 2. Over-count no longer
+	// errors — the OLDEST image is replaced with a placeholder and the most-recent
+	// two (the relevant ones in an iterative run) are kept, in order.
+	a := llm.Image("image/png", encPNG(t, gradient(2, 2))).(llm.ImagePart)
+	b := llm.Image("image/png", encPNG(t, gradient(4, 4))).(llm.ImagePart)
+	c := llm.Image("image/png", encPNG(t, gradient(8, 8))).(llm.ImagePart)
 	req := llm.Request{Messages: []llm.Message{
-		llm.UserParts(img, img),
-		llm.UserParts(img),
+		llm.UserParts(a, b),
+		llm.UserParts(c),
 	}}
-	_, err := Normalize(req, llm.Capabilities{MaxImagesPerReq: 2})
-	if !errors.Is(err, llm.ErrUnsupported) {
-		t.Fatalf("err = %v, want ErrUnsupported", err)
+	caps := llm.Capabilities{MaxImagesPerReq: 2, MaxImageDimension: 64, MaxImageBytes: 1 << 20, AllowedImageMIME: []string{"image/png"}}
+	out, err := Normalize(req, caps)
+	if err != nil {
+		t.Fatalf("over-count should not error: %v", err)
 	}
-	if !strings.Contains(err.Error(), "3 images") || !strings.Contains(err.Error(), "at most 2") {
-		t.Errorf("err message %q lacks the counts", err)
+	var imgs []llm.ImagePart
+	placeholders := 0
+	for _, m := range out.Messages {
+		for _, p := range m.Parts {
+			switch v := p.(type) {
+			case llm.ImagePart:
+				imgs = append(imgs, v)
+			case llm.TextPart:
+				if v.Text == imageOverflowPlaceholder {
+					placeholders++
+				}
+			}
+		}
+	}
+	// The exact survivors are the most-recent two, in order: b then c (a elided).
+	if len(imgs) != 2 || !bytes.Equal(imgs[0].Data, b.Data) || !bytes.Equal(imgs[1].Data, c.Data) {
+		t.Fatalf("kept %d images; want exactly [b, c] (the most-recent two)", len(imgs))
+	}
+	if placeholders != 1 {
+		t.Errorf("placeholders = %d, want 1 for the elided oldest image", placeholders)
+	}
+	// Input request untouched (copy-on-write): the first part is still image a,
+	// not a placeholder — a len check alone wouldn't catch in-place substitution.
+	first, ok := req.Messages[0].Parts[0].(llm.ImagePart)
+	if !ok || !bytes.Equal(first.Data, a.Data) {
+		t.Errorf("input request was mutated; first part = %+v", req.Messages[0].Parts[0])
 	}
 }
 

progress.md

@@ -1,5 +1,12 @@
 # progress
 
+## 2026-06-27 — llama-swaps (TLS) DSN scheme
+
+Follow-up to the llama-swap provider: added the `llama-swaps` DSN scheme (https
+base URL) alongside `llama-swap` (http, local-first), mirroring redis/rediss, so
+a TLS-fronted instance is first-class instead of being pushed to the `openai://`
+scheme. Scheme-only (no default built-in); shares one factory in builtin.go.
+
 ## 2026-06-27 — llama-swap provider + canonical image-gen interface
 
 **Landed (ADR-0015, ADR-0016).** New `provider/llamaswap`: chat **delegates to