executus — developer & agent guide

⚠️ This project is vibe-coded (AI-authored, human-steered). See README.md.

executus is a batteries-included base for LLM agent harnesses, layered strictly above majordomo. majordomo is the lean substrate (agent loop, llm types, providers, media, parse/failover/tiering). executus is the opinionated layer majordomo deliberately omits. executus requires no majordomo changes — it decorates llm.Model and wraps majordomo/agent.Agent.

North star

A brand-new project imports executus, does a little setup, and is most of the way to agentic capabilities. The mechanism is one shipped default per seam: executus.New() (once the runtime lands) is agentic with zero host wiring; the same builder lets a serious host swap each default for its own implementation and register its own tools.

Two consumers define the envelope:

mort (heavy) — Discord, mortbux, media, MySQL/GORM, DB-backed convar config, saved skills, audit, scheduling, run-critic.
gadfly (light) — a CI PR-reviewer Docker image, env-var configured, running an N-models × M-lenses structured-output swarm. Needs model fleet, lanes, bounded runs, structured output, fan-out, a few read tools — and none of the batteries.

That spread is why executus is tiered: a light host imports core only; a heavy host opts into batteries.

Module & layering

One module gitea.stevedudenhoeffer.com/steve/executus, go.mod = majordomo + stdlib only (no gorm/redis/discordgo/cgo). A second nested module contrib/store carries the SQLite dependency so the core never inherits it.

CORE (majordomo + stdlib):
  config/   ConfigSource seam (+ env default)            [P0 ✓]
  lane/     bounded fair-share worker pool               [P0 ✓]
  fanout/   programmatic N×M swarm                       [P0 ✓]
  deliver/  output egress seam (+ Discard/Stdout)        [P0 ✓]
  identity/ caller identity seams                        [P0 ✓]
  run/      run-loop mechanics + RunnableAgent DTO +     [P2 wip]
            nil-safe run.Ports (Audit/Budget/Critic/
            Checkpointer/PaletteSource) defined; the
            agentexec+skillexec -> run.Executor MERGE
            (consuming Ports) is the remaining P2 work    [P2]
  dispatchguard/  loop/depth/fan-out caps                [P0 ✓]
  pendingattach/  attachment dedupe                      [P0 ✓]
  tool/     registry + 3-stage permissions + ssrf        [P1 ✓]
  model/    config-driven tier resolution over majordomo [P1 ✓]
            (convar->config.Source; UsageSink/TraceSink seams; GenerateWith[T]
             structured output — no separate structured/ pkg)
  llmmeta/  shared meta-LLM helper over model/            [P1 ✓]
  compact/  context compactor (WithCompactor hook)       [P2]
  tools/{web,net,store,compose,meta,comms}  generic tools [P3]

BATTERIES (opt-in siblings, each nil-safe + a default):
  persona/   Agent noun + AgentStore seam + yml loader   [P4]
  skill/     rich Skill + SkillStore seam + toml loader  [P4]
  audit/     run-trace Sink (+ Noop/Slog)                [P4]
  critic/    two-tier timeout state machine + Escalator  [P4]
  schedule/  cron runner cores                           [P4]
  checkpoint/ durable resume seam                        [P4]
  budget/    rolling-window tracker (+ NoOp)             [P4]

contrib/store/   SECOND module (+ modernc.org/sqlite):   [P4]
  in-memory + pure-Go SQLite impls of every *Store seam

The one architectural move

The kernel must import no battery. In mort today, agentexec imports agents, agentcritic, and skillaudit directly — those three up-pointing edges get inverted into nil-safe run.Ports interfaces (PaletteSource, Critic, Audit) plus a RunnableAgent DTO. Everything else is wide-but-shallow repackaging.

Invariants (enforced in CI)

The core module builds with majordomo + stdlib only. go.sum must not contain gorm/redis/discordgo/sqlite/gin.
No core/* package imports a battery/* package.
Standard Go gates: go build, go vet, go test -race, go mod tidy clean.

Extraction roadmap

P0 module + zero-coupling moves + core seams (this) → P1 tool registry + model → P2 run kernel + Ports inversion → P3 generic tools + defaults → P4 persona/skill redesign + batteries + SQLite store → P5 gadfly on core (light-tier canary) → P6 rewire mort + tag v0.1.0. The mort-side rewrite reuses mort's existing mort_*_adapters.go wall as the host adapter layer.

Conventions

Keep README.md, this CLAUDE.md, and examples/ in sync with every change, in the SAME commit. No aspirational docs: when you add/rename a package, change a seam or a default, or alter the public API, update the docs and the relevant example so they always reflect reality (mirrors majordomo's house rule). The status markers in the tier map above must track what's actually landed.
Mirror majordomo's house style: gofmt; check errors immediately and wrap with fmt.Errorf("...: %w", err); // Why: comments where rationale isn't obvious; hermetic tests (majordomo's fake provider; no network in the default suite).
Every seam is an interface with a nil-safe accessor and a shipped default.
Keep the core seam surface small and stable — push churn into tools and host adapters, not core interfaces.

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