Full envelope (rules + reasoning + skills + commands) for a topic.

List configured topics. Pass tag to filter.

Create .keystone/harness/ and (by default) materialize the shipped template tree.

Idempotent — existing subdirs and files are reported in skipped, never overwritten. Call this once per project before scaffolding individual guides / sensors / actions / playbooks.

Pass materialize_templates=False to get the bare-bones directory layout only (no shipped state ledgers, sensors, actions, or playbooks). The full tree is the recommended default; opt out only for advanced use cases.

Scaffold a new guide markdown file under .keystone/harness/guides/.

tier ∈ iron-law | golden | rules. Strictness cascade: iron-law (can never be violated) > golden (hard rule; deviation requires explicit reasoning) > rules (regular rule; golden rules can override).

Scaffold a new sensor + its matching implementation.

Sensors are blocking rules. mode selects how the agent runs them:

• computational (default) → stamps scripts/<name>.sh (shell). Agent runs via Bash; exit 0 = pass, non-zero = fail.

• inferential → stamps prompts/<name>.md (markdown). Agent reads the prompt and performs the reasoning task it describes (e.g. code review, security review). Reports PASS / FAIL.

kind ∈ lint | type | test | build | drift | coverage | computational | domain | custom — informational category.

Scaffold a shell script under .keystone/harness/scripts/<name>.sh.

Use this to drop a script body without a sensor wrapper, or to refresh an existing script (with force=True). New scripts are chmod +x. Most projects scaffold sensors via keystone_new_sensor which stamps the matching script automatically.

Scaffold a prompt markdown under .keystone/harness/prompts/<name>.md.

Used by inferential sensors — the agent reads the prompt and performs the reasoning task it describes. Most projects scaffold inferential sensors via keystone_new_sensor(mode="inferential") which stamps the matching prompt automatically.

Scaffold .keystone/harness/skills/<name>/SKILL.md.

Skills are the FastMCP-native primitive for agent-discoverable procedural how-to. Each subdirectory containing a SKILL.md becomes a discoverable skill, surfaced as skill://<name>/SKILL.md and auto-loaded by agent runtimes (Claude Code, Cursor, etc.).

Manager-authored skills are named keystone-<slug>; the scaffolder prepends keystone- if missing.

Scaffold a new action markdown under .keystone/harness/actions/<name>.md.

Actions are short, focused operations the agent walks during a task — spec, orient, implement, verify, review, learn, audit, release. They complement playbooks (which orchestrate actions into a flow) and skills (which expose procedural how-to via the FastMCP skill:// scheme).

Scaffold a new playbook markdown under .keystone/harness/playbooks/<name>.md.

Playbooks orchestrate multiple actions into a higher-level flow with explicit phase gates: task, bootstrap, audit, install, verify, doctor, patch, release.

Scaffold a new corpus markdown under .keystone/harness/corpus/<name>.md.

Corpus entries are reasoning / background context — domain notes, architecture decisions, idioms. Not constraints (those go in guides/) and not procedures (those go in actions/, playbooks/, skills/).

Scaffold a per-agent adapter directory under .keystone/harness/adapters/<agent>/.

Install the agent's menu file(s) at the project root.

Menu files (CLAUDE.md, AGENTS.md, etc.) point the agent at .keystone/harness/ and at this MCP server. They are thin pointers, not content — the single source of truth lives in the harness. Phase 19 overlay semantics: only the region between <!-- BEGIN KEYSTONE --> and <!-- END KEYSTONE --> is rewritten; pre-existing user content is preserved.

Apply every pending shipped patch to the project harness.

Patches are forward-only. Files modified by the user since the previous shipped version are skipped and reported as conflicts; the user resolves them by hand. Today no patches ship — the call reports an empty applied list. Future releases populate templates/patches/<version>/.