AGENTS.md API - Pioneer

The AGENTS.md API manages persistent instruction files attached to the thread tree. A file can exist at the workspace root or inside a thread folder. Threads use the nearest active file from their folder ancestry. The methods live under thread/agents_doc/* because AGENTS.md is part of the workspace thread tree, not the artifact store. Payloads use snake_case field names.

Methods

Method	Params	Result	Purpose
`thread/agents_doc/get`	`ThreadAgentsDocGetParams`	`ThreadAgentsDocGetResponse`	Load the explicit file for one root/folder scope and the effective inherited file.
`thread/agents_doc/save`	`ThreadAgentsDocSaveParams`	`ThreadAgentsDocSaveResponse`	Create or update the explicit file for one root/folder scope.
`thread/agents_doc/archive`	`ThreadAgentsDocArchiveParams`	`ThreadAgentsDocArchiveResponse`	Archive the explicit file for one root/folder scope.
`thread/agents_doc/resolve_for_thread`	`ThreadAgentsDocResolveForThreadParams`	`ThreadAgentsDocResolveForThreadResponse`	Resolve the effective file for one concrete thread.

thread/tree also returns an agents_docs array containing ThreadAgentsDocSummary items. Summaries never include full file content.

Status And Save Reason

Type	Values
`ThreadAgentsDocStatus`	`draft`, `active`, `archived`
`ThreadAgentsDocSaveReason`	`autosave`, `manual`

draft means the explicit document exists but is empty. Drafts are visible to clients but are not effective prompt sources. active means non-empty content and participates in inheritance. archived means deleted from the user-facing tree.

Payloads

ThreadAgentsDocPayload includes full content:

{
  "id": "agd_000000000000000001",
  "workspace_id": "ws_000000000000000001",
  "folder_id": "fld_000000000000000001",
  "status": "active",
  "title": "AGENTS.md",
  "content": "# Backend instructions\n\n- Run cargo check.\n",
  "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
  "version": 3,
  "created_at": 1777900000,
  "updated_at": 1777900300
}

For a root file, folder_id is omitted or null. ThreadAgentsDocSummary is the content-free tree shape:

{
  "id": "agd_000000000000000001",
  "workspace_id": "ws_000000000000000001",
  "folder_id": "fld_000000000000000001",
  "status": "active",
  "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
  "version": 3,
  "char_count": 42,
  "updated_at": 1777900300
}

ThreadAgentsDocResolvedPayload describes the effective active file for a requested scope or thread:

{
  "doc": {
    "id": "agd_000000000000000001",
    "workspace_id": "ws_000000000000000001",
    "status": "active",
    "title": "AGENTS.md",
    "content": "# Root instructions\n",
    "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
    "version": 1,
    "created_at": 1777900000,
    "updated_at": 1777900000
  },
  "source_path": [],
  "inherited": true,
  "resolved_for_folder_id": "fld_000000000000000001",
  "resolved_at": 1777900400
}

source_folder_id is omitted for a root source. source_path is an array of folder names from the thread tree root to the source folder.

Reading A Scope

Call thread/agents_doc/get when opening an AGENTS.md editor for root or folder scope.

{
  "jsonrpc": "2.0",
  "id": "aaaaaaaaaaaaaaaaaaaaa",
  "method": "thread/agents_doc/get",
  "params": {
    "workspace_id": "ws_000000000000000001",
    "folder_id": "fld_000000000000000001"
  }
}

Response:

{
  "explicit": {
    "id": "agd_000000000000000002",
    "workspace_id": "ws_000000000000000001",
    "folder_id": "fld_000000000000000001",
    "status": "draft",
    "title": "AGENTS.md",
    "content": "",
    "content_sha256": "e3b0c44298fc1c149afbf4c8996fb924...",
    "version": 1,
    "created_at": 1777900000,
    "updated_at": 1777900000
  },
  "effective": {
    "doc": {
      "id": "agd_000000000000000001",
      "workspace_id": "ws_000000000000000001",
      "status": "active",
      "title": "AGENTS.md",
      "content": "# Root instructions\n",
      "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
      "version": 1,
      "created_at": 1777900000,
      "updated_at": 1777900000
    },
    "source_path": [],
    "inherited": true,
    "resolved_for_folder_id": "fld_000000000000000001",
    "resolved_at": 1777900400
  }
}

explicit can be absent when the requested scope has no local file. effective can be absent when no active file exists in the scope ancestry. For the root scope, omit folder_id:

{
  "jsonrpc": "2.0",
  "id": "bbbbbbbbbbbbbbbbbbbbb",
  "method": "thread/agents_doc/get",
  "params": {
    "workspace_id": "ws_000000000000000001"
  }
}

Saving

Clients save the explicit file for one scope. The gateway normalizes line endings and computes content_sha256.

{
  "jsonrpc": "2.0",
  "id": "ccccccccccccccccccccc",
  "method": "thread/agents_doc/save",
  "params": {
    "workspace_id": "ws_000000000000000001",
    "folder_id": "fld_000000000000000001",
    "content": "# Backend instructions\n\n- Run cargo check.\n",
    "expected_version": 2,
    "save_reason": "autosave"
  }
}

Response:

{
  "doc": {
    "id": "agd_000000000000000001",
    "workspace_id": "ws_000000000000000001",
    "folder_id": "fld_000000000000000001",
    "status": "active",
    "title": "AGENTS.md",
    "content": "# Backend instructions\n\n- Run cargo check.\n",
    "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
    "version": 3,
    "created_at": 1777900000,
    "updated_at": 1777900300
  }
}

If content is empty or whitespace-only after normalization, the saved document status is draft. Drafts are not injected into prompts. expected_version is optional but recommended for any editor with autosave. If the current server version differs, the gateway returns a JSON-RPC error with code -32600 and a message containing the expected and actual versions. content is limited to 65536 characters.

Archiving

Archive removes the explicit file from the visible tree and allows inherited parent files to become effective again.

{
  "jsonrpc": "2.0",
  "id": "ddddddddddddddddddddd",
  "method": "thread/agents_doc/archive",
  "params": {
    "workspace_id": "ws_000000000000000001",
    "folder_id": "fld_000000000000000001",
    "expected_version": 3
  }
}

Response:

{
  "archived": true,
  "effective": {
    "doc": {
      "id": "agd_000000000000000010",
      "workspace_id": "ws_000000000000000001",
      "status": "active",
      "title": "AGENTS.md",
      "content": "# Root instructions\n",
      "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
      "version": 1,
      "created_at": 1777900000,
      "updated_at": 1777900000
    },
    "source_path": [],
    "inherited": true,
    "resolved_for_folder_id": "fld_000000000000000001",
    "resolved_at": 1777900500
  }
}

If there was no explicit file for the scope, archived is false.

Resolving For A Thread

Use this method when a client needs to inspect the effective file for a specific thread.

{
  "jsonrpc": "2.0",
  "id": "eeeeeeeeeeeeeeeeeeeee",
  "method": "thread/agents_doc/resolve_for_thread",
  "params": {
    "workspace_id": "ws_000000000000000001",
    "thread_id": "thr_000000000000000001"
  }
}

Response:

{
  "effective": {
    "doc": {
      "id": "agd_000000000000000001",
      "workspace_id": "ws_000000000000000001",
      "folder_id": "fld_000000000000000001",
      "status": "active",
      "title": "AGENTS.md",
      "content": "# Backend instructions\n",
      "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
      "version": 3,
      "created_at": 1777900000,
      "updated_at": 1777900300
    },
    "source_folder_id": "fld_000000000000000001",
    "source_path": ["Backend"],
    "inherited": false,
    "resolved_for_folder_id": "fld_000000000000000001",
    "resolved_at": 1777900600
  }
}

If the thread has no placement, the gateway resolves against the root scope.

Thread Tree Summaries

thread/tree includes AGENTS.md summaries:

{
  "workspace_id": "ws_000000000000000001",
  "threads": [],
  "folders": [],
  "placements": [],
  "agents_docs": [
    {
      "id": "agd_000000000000000001",
      "workspace_id": "ws_000000000000000001",
      "folder_id": "fld_000000000000000001",
      "status": "active",
      "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
      "version": 3,
      "char_count": 42,
      "updated_at": 1777900300
    }
  ]
}

Clients should use these summaries to render sidebar file rows and call thread/agents_doc/get only when opening the editor.

Notifications

The gateway sends thread/agents_doc/changed after save or archive:

{
  "jsonrpc": "2.0",
  "method": "thread/agents_doc/changed",
  "params": {
    "workspace_id": "ws_000000000000000001",
    "folder_id": "fld_000000000000000001",
    "doc": {
      "id": "agd_000000000000000001",
      "workspace_id": "ws_000000000000000001",
      "folder_id": "fld_000000000000000001",
      "status": "active",
      "title": "AGENTS.md",
      "content": "# Backend instructions\n",
      "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
      "version": 3,
      "created_at": 1777900000,
      "updated_at": 1777900300
    },
    "effective": {
      "doc": {
        "id": "agd_000000000000000001",
        "workspace_id": "ws_000000000000000001",
        "folder_id": "fld_000000000000000001",
        "status": "active",
        "title": "AGENTS.md",
        "content": "# Backend instructions\n",
        "content_sha256": "9f86d081884c7d659a2feaa0c55ad015...",
        "version": 3,
        "created_at": 1777900000,
        "updated_at": 1777900300
      },
      "source_folder_id": "fld_000000000000000001",
      "source_path": ["Backend"],
      "inherited": false,
      "resolved_for_folder_id": "fld_000000000000000001",
      "resolved_at": 1777900600
    },
    "effective_changed": true
  }
}

The gateway also sends thread/tree/changed so tree-based clients can refresh summaries. Treat notifications as invalidation hints; reload the affected scope or tree before rendering stale state as authoritative.

Errors

Common validation errors use standard JSON-RPC codes:

Condition	Code
Unknown workspace	`-32602`
Empty `folder_id`	`-32602`
Folder does not exist in the workspace	`-32602`
Content over 65536 characters	`-32602`
Version conflict	`-32600`
Database or internal processing failure	`-32600`

Schemas

Generated schemas include:

/schemas/thread_agents_doc_status.json
/schemas/thread_agents_doc_save_reason.json
/schemas/thread_agents_doc_payload.json
/schemas/thread_agents_doc_summary.json
/schemas/thread_agents_doc_resolved_payload.json
/schemas/thread_agents_doc_get_params.json
/schemas/thread_agents_doc_get_response.json
/schemas/thread_agents_doc_save_params.json
/schemas/thread_agents_doc_save_response.json
/schemas/thread_agents_doc_archive_params.json
/schemas/thread_agents_doc_archive_response.json
/schemas/thread_agents_doc_resolve_for_thread_params.json
/schemas/thread_agents_doc_resolve_for_thread_response.json
/schemas/thread_agents_doc_changed_notification.json

AGENTS.md User Guide explains the desktop workflow.
AGENTS.md Architecture explains persistence, inheritance, and prompt hook injection.
Threads API documents thread tree and folder APIs.

​Methods

​Status And Save Reason

​Payloads

​Reading A Scope

​Saving

​Archiving

​Resolving For A Thread

​Thread Tree Summaries

​Notifications

​Errors

​Schemas

​Related Pages

Methods

Status And Save Reason

Payloads

Reading A Scope

Saving

Archiving

Resolving For A Thread

Thread Tree Summaries

Notifications

Errors

Schemas

Related Pages