--- name: actors description: Highest-density practical guide for pi-actors. Read this skill whenever prompt and tools are not enough for spawn, message, inspect, actor runs, tools, recipes, command templates, async lifecycle, mailboxes, artifacts, and local orchestration mechanics. metadata: version: 0.29.3 --- # Actors (pi-actors) `pi-actors` turns trusted local capabilities into addressable actors. This skill is the compact operator/reference layer for the extension itself: tools, nouns, lifecycle, message protocol, recipes, and common edge cases. It is not a multi-agent strategy guide; use a swarm skill for decomposition, quorum design, reviewer lenses, and consensus methodology. Maintain this skill as the extension's agent-facing manual. When implementation changes reveal new durable mechanics, invariants, warnings, or safer operating patterns, update this skill alongside code/docs so future agents learn the current actor model instead of rediscovering it. ## Knowledge Surfaces Context arrives in layers: - **Injected prompt**: always present at extension load. It is a bootstrap/reminder of current verbs, paths, and runtime rules; it should not try to be documentation. - **Skill header**: automatically matched by agents from `name`/`description`. Its job is to signal: if pi-actors use is unclear, read this skill body. - **This skill body**: highest-density practical reference. It should explain extension operation from multiple angles and link to deeper docs without becoming a changelog or swarm-methodology guide. - **README**: human entrypoint. It explains what pi-actors is, why it matters, benefits, rhythm, and representative scenarios; it is not automatically in agent context. - **Docs**: transportable standards by domain: command templates, recipes, async runs, actor messages, registry, recipe library; read on demand. - **AGENTS.md**: project context for agents changing pi-actors: architecture constraints, durable conventions, do/don't rules, validation; read for repo work. ## Core Nouns ```text Trusted local capability -> Command template execution graph -> Recipe saved actor definition -> spawn starts one run instance -> run: addressable actor Trusted local capability -> Command template or recipe -> register_tool persists an agent-callable wrapper -> tool: addressable tool actor ``` - **Command template**: portable execution graph. String leaf, sequence array, or object node with controls. - **Recipe**: saved JSON definition wrapping a template with args, defaults, imports, mailbox, artifacts, metadata, and optional `async: true`. - **Run actor**: one detached execution instance addressable as `run:` with status, logs, messages, mailbox metadata, files, communication snapshot, and artifacts. - **Room actor**: shared timeline + roster endpoint addressable as `room:`; every spawned run gets `room:`. - **Tool actor**: registered persistent capability addressable as `tool:` and callable through the generated tool or `message`. `tool:pi-actors` is reserved for runtime/status inspection. - **Coordinator/session**: the current pi session endpoint that receives bounded actor follow-ups. - **Mailbox**: public interaction contract: message types the actor accepts/emits. - **Artifact**: named durable output path declared by a recipe/run. ## Three Verbs ### `spawn` — create a run actor Use for long work, background services, subagents, fanout, pipelines, and reusable recipes. ```json { "as": "run:repo-health", "file": "pipeline-repo-health", "values": { "path": "/repo" }, "artifacts": { "report": "/tmp/repo-health.md" } } ``` Rules: - Use `file`/`recipe` for saved recipes; bare names resolve under `~/.pi/agent/recipes`. - Use inline `template` for one-off experiments; promote useful repeats to recipes. - When a successful actor follow-up suggests persistence, decide whether the pattern deserves durable tool memory; call `register_tool` yourself only when the evidence is strong, and ask before writing the user recipe root. - Use stable `as` names when you will inspect or message the actor later. - `async: true` on the recipe is the detached run switch. ### `message` — send a typed envelope ```json { "to": "run:repo-health", "type": "control.cancel", "summary": "Cancel stale repo-health run", "body": {} } ``` Envelope fields: - Required: `to`, `type`. - Useful: `summary`, `body`, `from`, `reply_to`, `correlation_id`, `metadata`. - Addresses: `run:`, `branch:/`, `room:`, `tool:`, `coordinator`, `session:`. - Room posts require `from` from the same run (`run:` or `branch:/`). - Runtime termination message: `control.kill` is the only documented actor message that kills a run. `control.stop` and `control.cancel` are actor-local mailbox vocabulary only when a recipe declares and handles them. Terminal retention messages: `control.archive`, `control.prune`. Check `inspect view=mailbox` before domain-specific messages. ### `inspect` — observe intentionally ```json { "target": "run:repo-health", "view": "status" } { "target": "run:repo-health", "view": "tail", "lines": "80" } { "target": "run:repo-health", "view": "messages" } { "target": "run:repo-health", "view": "communication" } { "target": "run:repo-health", "view": "artifacts" } { "target": "room:repo-health", "view": "status" } { "target": "room:repo-health", "view": "roster" } { "target": "room:repo-health", "view": "contacts" } { "target": "room:repo-health", "view": "previews" } { "target": "tool:pi-actors", "view": "status" } { "target": "tool:music_player", "view": "status" } { "target": "recipes", "view": "status" } { "target": "coordinator", "view": "status" } ``` Views: - `status`: lifecycle, pid, values, progress, result, compact summary. - `tail`: recent stdout/stderr/log tail. - `messages`: actor messages emitted by the run, or room timeline entries for `room:*`. - `communication`: run/branch communication snapshot with self/root/default-room/member/contact hints. - `roster`: room member list with address, role, parent, caps, claim, status, and last seen. - `contacts`: roster-derived direct-message targets without full roster metadata. - `previews`: TUI-ready bounded room message previews with timestamp/from/to/type/summary/body_preview. - `mailbox`: declared accepts/emits contract for runs; queued direct branch inbox messages for `branch:/` with `id`, status, route/type, and queue/handling timestamps. - `files`: run state directory file list. - `artifacts`: declared artifact paths/status. - `recipes` target: registry summary for active, shadowed, invalid, disabled, and diagnostic recipe entries. Actor inspector commands: - `/actors-inspector-toggle [rows]`: open/close the compact table or set row count; default is 12 log rows when no size is supplied. - `/actors-inspector-filter all|room|direct|broadcast|unread|branch |current-branch |mention `: narrow table previews without changing room/run state. - `/actors-inspect `: open one visible row as a full-message view. The table is compact and optimistic by default: bounded body previews, capped noisy room rows, branch-local inbox previews, stable event ids in selected-message details, and an inline roster summary in the form `name/role` that wraps only when needed. Use `unread` for queued branch inbox work and `branch ` / `current-branch ` for one branch's room/direct/inbox traffic. Rows with `metadata.requires_response=true` show a `!` attention marker. `/actors-inspect ` marks that row read for the current session filter. Active roster members use the target color; members that sent `actor.leave` stay visible as inactive/muted participants from the current run. Actor display names come from `actor.join` bodies (`display`) or branch addresses, keeping debugger output plain and name-driven. Let terminal notifications arrive; avoid sleep-poll loops except during diagnosis. ## Runtime Communication Rules - Keep one public communication model: `spawn` creates actors, `message` sends typed envelopes, and `inspect` observes. Avoid adding public side channels or storage nouns when a normal actor address/view can express the operation. - Keep route and semantic type separate. Direct, room, coordinator, and session messages may share `type`; delivery behavior comes from `to`. - Treat inspector-visible communication logs as recipe evidence. Use `inspect room: view=messages|previews`, `inspect run: view=communication`, and the actor inspector table/full-message views to improve mailbox/artifact conventions after real runs. - Any UI, summary, or aggregate view that scans run directories must apply coordinator/session ownership filters before exposing summaries or body previews. - Treat `communication.json` as visible actor context, not a global mutable truth table. Run-level snapshots should identify the run actor; branch-local snapshots should identify the branch actor. - Prefer same-run provenance checks on lateral actor routes. If `from` is accepted for room or branch routes, validate that it belongs to the addressed run. ## Command Template Standard Forms: ```json "npm test -- {file}" ["npm run typecheck", "npm test"] { "parallel": true, "template": ["job-a", "job-b"] } ``` Controls: - `args`, `defaults`: public placeholder declarations and defaults. - `parallel: true`: fanout child nodes. - `when`: conditional execution. - `timeout`, `delay`, `retry`: timing and retry controls; string placeholders are allowed where supported. - `failure`: `continue`, `branch`, or `root` propagation. - `recover`: cleanup between retry attempts. - `repeat`: repeated node expansion. - `output`: output behavior selection. Placeholders: - `{name}` required value. - `{name=default}` inline default. - `{name:type=default}` typed inline arg. - `{value??fallback}` nullish fallback. - `{flag?yes:no}` ternary fallback. Templates are synchronous and portable. Recipes give them identity and lifecycle. ## Recipe Standard Minimal actor recipe: ```json { "async": true, "args": ["path:path", "model:string"], "defaults": {}, "mailbox": { "accepts": ["control.kill"], "emits": ["command.done", "run.done", "run.failed"] }, "artifacts": { "report": "{path}/report.md" }, "template": "some-command {path} --model {model}" } ``` Rules: 1. Every recipe owns `template` directly. 2. `async: true` makes spawned work a detached actor run. 3. Public knobs belong in `args`/`defaults`; hidden launch mechanics stay inside `template`. 4. Use `imports` to compose recipes; imported recipes are definitions, not nested async runs. 5. Declare `mailbox` for actors that accept or emit meaningful messages. 6. Declare `artifacts` for durable outputs the coordinator should inspect. 7. File-backed recipe identity comes from the filename basename; legacy top-level `name` fields are ignored by loaders. 8. File-backed async recipes pass child `pi -p` actors a bounded JSONL recipe context bundle by default: raw entry/import recipe records, derived `name`, import path/alias, and `"you_are_here": true` on the launching recipe node. Set `"actor_context": false` or `"off"` to suppress it for minimal prompts. 9. Keep packaged recipes generic: no machine-local paths, no private companion identities, no project-specific defaults unless the recipe is explicitly project-specific. 10. Do not ship concrete model-version defaults in packaged recipes; expose `model`, `models`, and stage-specific model args so the caller must choose current policy at launch. Priority for same-id recipes: 1. No recipe: no capability. 2. Packaged pi-actors recipe: standard-library declarative actor component. 3. Explicit ad hoc user recipe file outside `~/.pi/agent/recipes`. 4. User recipe in `~/.pi/agent/recipes/*.json` or `*.md`: highest-priority operator tool surface. Only matching filename ids compete. Higher priority shadows lower priority; within one priority layer, same-id JSON shadows Markdown. An invalid or `disabled: true` higher-priority recipe blocks fallback so the agent does not silently run standard-library behavior when a user override is broken or intentionally disabled. Muscle-memory lens: pi-actors has two durable executable-memory layers. 1. `~/.pi/agent/recipes/*.json` and `*.md` are the agent's active capability memory. Every recipe in that directory becomes an easy-to-call tool automatically and survives into later sessions. Descriptions matter here because they become the tool's operator-facing title/context. 2. `~/.pi/agent/recipes/candidates/*.json` is candidate memory captured from successful inline `spawn template=...` runs. Candidates are not registered tools and do not enter the injected tool surface. They remain reusable by explicit path, e.g. `spawn file="~/.pi/agent/recipes/candidates/.json"`, and can be promoted by moving or copying one level up into `~/.pi/agent/recipes`. Agents grow active memory by calling `register_tool` or by deliberate recipe-file edits. They grow candidate memory by trying ad hoc actors successfully. Treat both as executable habits: candidates are the workbench/proving ground; root recipes are promoted muscle memory. Usage lens: user recipes may carry extension-maintained launch metadata such as `usage.calls` and `usage.last_called`. The extension increments the counter when it starts that concrete recipe; agents should not hand-edit counters as part of normal recipe maintenance. Treat usage as evidence for usefulness analysis: heavily used recipes are good candidates for promotion, documentation, or stronger tests; unused recipes are cleanup candidates. Do not use failure counts as a primary usefulness signal because failures may reflect bad caller judgment rather than bad recipes. Do not delete or demote solely from counters without operator approval. Promotion lens: successful transient/ad hoc actor runs are evidence, not commands. Inline spawns leave candidate recipes as replayable evidence, not active tools. If a candidate is repeatable, parameterized, safe enough, and likely useful later, the agent may promote it by moving/copying it into `~/.pi/agent/recipes` or by calling `register_tool` with a concise name, typed args/defaults, and a reviewed template or recipe path. Do not auto-register every success; do not promote temp paths, secrets, one-off prompts, or project-private assumptions without normalization and approval. Cleanup rule: periodically inspect `~/.pi/agent/recipes` as the live muscle-memory set. For each stale, duplicate, too-specific, or low-value recipe, choose one explicit action: keep as a tool, move it out of the agent recipe root to retain recipe-only memory, merge into a better recipe, or delete/archive the file. Prefer moving over deletion when the recipe may still be useful as a component. Never silently remove tools during unrelated work. ## Registered Tools `register_tool` persists trusted local capabilities as recipe files in `~/.pi/agent/recipes/*.json`; hand-authored Markdown recipes in the same directory are also discovered as tools. Use it when a command/template/recipe should become durable agent muscle memory. Prefer typed args or placeholder-derived args; use `update=true` for replacement and `template=null` or `template=""` for deletion. `register_tool` should create/update/delete recipe files in the user recipe root; direct file editing is allowed but is the lower-level path. Tool-registration lenses are open-ended prompts for deciding what deserves durable tool status: 1. **Reliability lens**: register wrappers for operations where agents commonly omit checks, run steps out of order, pass ambiguous inputs, or recover poorly from partial failure. 2. **Safety lens**: prefer read-only diagnostics, dry-runs, preflights, confirmations, or bounded adapters around high-impact operations before registering direct action tools. 3. **Context-affordance lens**: register tools whose mere presence in the injected capability list should steer agents toward the right operational habit. 4. **Existing-recipe lens**: scan already-authored recipes before inventing a new tool. Packaged recipes, ad hoc project recipes, and recipes co-located under skill directories are often the first candidates to copy/register into the user recipe root when they match a recurring local workflow. 5. **Composition lens**: register small semantic entrypoints over reusable recipe components instead of baking one large scenario-specific shell command into a tool. 6. **Portability lens**: keep recipe files transportable; make tool exposure a consequence of placement in `~/.pi/agent/recipes`, not recipe-owned markers or machine-local assumptions. Default bias: register diagnostic/preflight tools before action tools, and promote existing recipes before writing new orchestration. A good persistent tool shrinks the chance of a subtle operational mistake, not just the number of keystrokes. Tool templates may be: - A foreground command template. - A file-backed recipe name/path. - A complete recipe body, optionally `async: true`. The user recipe root is the default tool set by location. It accepts canonical JSON recipes and literate Markdown recipes with frontmatter plus fenced `template`/`json recipe` blocks; same-id JSON shadows Markdown in the same priority layer. Packaged recipes are lower-priority standard-library components and are not tools unless copied or registered into the agent recipe root. Ideal runtime behavior is reactive: create/edit/delete recipe files, validate them, then connect valid tools or surface diagnostics without requiring agents to hand-maintain a separate registry. ## Top Recipes Use packaged recipes by name with `spawn file=` for async actors, or register/call them as tools when repeated use deserves a stable shortcut. - [`pipeline-room-swarm`](../../recipes/pipeline-room-swarm.json): room-visible swarm coordination with roles, rounds, optional locker, artifact synthesis, and `subagent_ttl_ms` for hard participant budgets. - [`pipeline-repo-health`](../../recipes/pipeline-repo-health.json): git/doc/validation evidence → normalized repository health report. - [`pipeline-release-readiness`](../../recipes/pipeline-release-readiness.json): changelog/package/skill/validation evidence → release review → artifact report. - [`actor-worker`](../../recipes/actor-worker.json): canonical mailbox-backed branch worker reference for claim/handle/status/artifact patterns. - [`coordinator-locker`](../../recipes/coordinator-locker.json): queue + lease locks + journaled coordinator messages for multi-actor ownership. ## Deep References - `docs/actors-deep-reference.md` — recipe navigator, operating patterns, lifecycle discipline, pitfalls. - `docs/command-templates.md` — execution graph semantics. - `docs/template-recipes.md` — recipe storage, imports, defaults, references. - `docs/async-runs.md` — detached lifecycle, state, cancellation, observability. - `docs/actor-messages.md` — addressed envelope protocol and mailbox model. - `docs/tool-registry.md` — persistent tool registry and generated tools. - `docs/recipe-library.md` — packaged recipes. - `docs/task-first-recipes.md` — deriving reusable pipelines from operator tasks. - `docs/component-recipes.md` — reusable coordinator/subagent building blocks. ## One-Sentence Contract Use pi-actors to wrap local capabilities as addressable actors: define launch with templates, preserve semantics in recipes/tools, start with `spawn`, communicate with `message`, observe with `inspect`, and hand off durable results through messages and artifacts.