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run: critic parity — fuller RecordStep + cause-carrying Kill (distinct status)
Completes the run-critic seam so a host adapter (mort's agentcritic) has full
fidelity, closing the two limitations gadfly surfaced on mort #1334.

- RecordStep(iter int, resp *llm.Response): the completed step's model response
  is now passed to the critic (was index-only), so a host that records a trace
  (mort's ProgressRecorder) can show what the agent actually produced, not just
  an iteration count. The executor forwards s.Response; the battery ignores it
  (its Progress is count-based).
- CriticHandle.KillCause() error + ErrCriticKill: the executor now distinguishes
  an explicit critic KILL from a natural backstop expiry. runCtx uses a
  cause-carrying cancel (WithCancelCause + a MaxRuntime timer cancelling with
  DeadlineExceeded); the deadline-watch cancels with ErrCriticKill when
  KillCause()!=nil, else DeadlineExceeded. statusFor reads context.Cause →
  killed / timeout / cancelled are now distinct (were all "cancelled"). The
  battery sets killCause from Decision.KillReason on a Kill.

Tests: statusFor "killed" case (cause=ErrCriticKill, err=Canceled); fake handle
+ battery RecordStep/KillCause signatures. Core stays battery-free.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-27 16:35:13 -04:00

executus

⚠️ This project is vibe-coded. executus is written almost entirely by an AI coding agent (Claude), with a human steering at the design and review level rather than typing the code. That's a deliberate choice, stated up front — the same way gadfly is. Read the code before you depend on it, pin a version, and file issues if something looks off. It is offered as-is.

A batteries-included base for building LLM agent harnesses in Go. Import it, do a little wiring, and you have agentic capabilities: a bounded run loop, a tool registry with a suite of common tools, context compaction, config-driven model tiering and failover, structured output, and parallel fan-out — with sensible defaults so a brand-new project is agentic with almost no setup, and pluggable seams so a serious host can swap in its own storage, config, delivery, and tools.

executus sits strictly above majordomo — the lean LLM substrate (agent loop, canonical llm types, providers, media normalization, model parsing / failover / tiering). majordomo stays the substrate; executus is the opinionated, batteries-included layer on top. executus requires no changes to majordomo.

Status

Early. Being extracted, phase by phase, from the agent layer of mort (a Discord bot) — mort and gadfly are the first two consumers (heavy and light). See CLAUDE.md for the architecture and the extraction roadmap (P0P6).

Available today:

  • run/executus is runnable. run.Executor ties model resolution, the tool registry, majordomo's agent loop, context compaction, run-bounding, and step/audit instrumentation into one Run(ctx, RunnableAgent, inv) Result, with every host concern behind a nil-safe run.Ports (Audit/Budget/Critic/ Checkpointer/PaletteSource/Delivery). See examples/minimal.
  • model/ — config-driven tier resolution + failover over majordomo, with pluggable UsageSink/TraceSink and GenerateWith[T] structured output.
  • tool/ — the tool registry + 3-stage permission model + SSRF guard.
  • compact/ — the per-run context compactor.
  • lane/ — bounded worker pool with fair-share queueing (run- and provider-concurrency).
  • fanout/ — programmatic N×M swarm with bounded global + per-key concurrency.
  • config/, deliver/, identity/ — host seams (config / output / identity), each with a shipped default.
  • dispatchguard/, pendingattach/ — run-safety primitives.
  • examples/reviewer — a gadfly-shaped PR reviewer on the core only (env-config model fleet → fanout N×M swarm → model.GenerateWith[T] structured findings → consolidation), the light-tier canary; CI asserts it pulls in no battery.

Design

Two tiers in one module (go.mod = majordomo + stdlib only):

  • Core — everything a light host needs to be agentic: run loop, tool registry + common tools, model resolution, compaction, lanes, fan-out, structured output. No persistence, no scheduling.
  • Batteries (opt-in sibling packages) — persona/agent nouns, saved skills, audit, run-critic, scheduling, budgets, checkpointing. Each is nil-safe and ships a default, so you add only what you use.

Persistence that needs a real database lives in a separate nested module (contrib/store, pure-Go SQLite) so the core never drags in a DB driver — a static-binary host (gadfly) stays static.

License

TBD.

S
Description
Batteries-included base for building LLM agent harnesses in Go (above majordomo). Vibe-coded.
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