version: "1.0.1" name: agent-definitions description: Manage Pi Herdsman Agent definitions and reserved role profiles. Use when inspecting, creating, customizing, enabling, disabling, or changing Agent-definition models, thinking, tools, skills, extensions, delegation, permissions, or instructions.

Pi Herdsman Agent definitions

Manage Agent definitions through Herdsman's existing Markdown configuration. The runtime definition engine and canonical documentation remain authoritative; this skill does not define a second schema or management API.

Workflow

1. Inspect the Markdown definition layers before changing configuration.

• Identify a definition by its frontmatter name, never by its filename.

Inspect bundled, trusted project, and global layers in precedence order (bundled < project < global), including which files contribute to the effective definition. Project definitions apply only when Pi trusts the project.

• Resolve matching overlays and effective field values before choosing the

requested project or global edit scope. list_agents is useful after an edit to invoke Herdsman's existing discovery and validation, but its enabled-definition capability summary does not expose source paths or complete configuration. It cannot establish effective configuration by itself.

• Disabled definitions, definitions with unavailable required children,

and reserved role profiles are not included in the runtime definition capability list; inspect their Markdown layers directly. Reserved role definitions have special restrictions. Chief is global-only; project-local Chief definitions are rejected.

• Read the canonical contract when exact field behavior matters:
• ../../docs/reference/agent-definition-schema.md
• ../../docs/guides/agent-definitions.md
• ../../docs/guides/customizing-agents.md

1. Choose the configuration layer from the requested scope.

• Project policy: <cwd>/.pi/agents/.
• Global user policy: $PI_CODING_AGENT_DIR/agents/ when that variable is

set, otherwise ~/.pi/agent/agents/.

• If scope is genuinely ambiguous and materially changes the result, ask.
• Never edit bundled definitions under dist/agent-definitions/.

1. Make the smallest correct Markdown change.

• Prefer a partial overlay over copying a complete lower-precedence

definition.

• Preserve unrelated frontmatter, body content, and existing source files.
• The frontmatter name is the definition identity; the filename is not.
• Array fields replace the whole lower-precedence array. Before adding or

removing one array value, inspect the effective array and write the desired complete replacement.

• For additive prompt instructions, prefer an overlay body with

bodyMode: append; replace the body only when replacement is intended.

• Express capability restrictions structurally through definition fields

rather than relying on prompt prose.

• Herdsman preserves permission: for compatible extensions but does not

enforce its contents itself.

• Before editing a reserved role definition, read the canonical schema for

its restrictions and authority boundaries.

• Lead, Manager, and Chief runtime profiles are not launch definitions. They

support only name, description, body, bodyMode on overlays, tools, and excludeTools. Do not configure model, thinking, prompt launch mode, enabled/permission/agent policy, tools-default switches, skills, extensions, or context inheritance on these profiles. Their tool policy affects registered ordinary tools; Herdsman-owned tools cannot be activated through a profile and mandatory required coordination tools remain available. Manager defaults to no ordinary tools (tools: []); explicit overlays can select registered ordinary tools. The saved ordinary Lead tool baseline is restored when Manager mode ends. Chief also defaults to no ordinary tools and accepts global overrides only. Inspect effective definition layers, validate edits, and repeat /manager to refresh a running Manager.

1. Validate through Herdsman's existing definition engine where available.

• After an edit in a Lead session, call list_agents again. Treat any

discovery or validation failure as a failed edit and repair or restore the target file. Its returned summary can confirm discoverability and validation, not the complete effective configuration.

• If list_agents is unavailable, do not claim that the effective Herdsman

definition set was runtime-validated. The next normal definition discovery will validate it.

1. Inspect the effective result using the definition layers and available

runtime evidence. Report the changed scope and file, effective change, and validation evidence; distinguish configuration inspection from runtime validation. Agent-definition changes affect future Agent assignments; they do not mutate an active Agent. Lead execution profiles resolve at session start, resume, or /lead. Manager and Chief profiles resolve at role activation or restoration; repeating /manager or /chief refreshes the active profile. managed-lead is launch policy: changes do not hot-reconfigure an assigned Lead, and taking effect requires a later managed Lead process start.