---
name: langbot-mcp-ops
description: Operate a LangBot instance through its built-in MCP (Model Context Protocol) server. Use when an AI agent needs to manage LangBot — list/create/update/delete bots, agents, pipelines, models, knowledge bases, MCP servers, and skills — over MCP instead of raw HTTP. Covers the /mcp endpoint, API-key auth (web-UI lbk_ keys and the config.yaml global key), the tool surface, and client configuration. Triggers on "langbot mcp", "manage langbot via mcp", "langbot /mcp", "langbot mcp server".
---

# LangBot MCP Operations

LangBot exposes an **MCP server** so AI agents can manage an instance
programmatically. It mirrors a curated subset of the HTTP service API.

## Endpoint

```
http://<langbot-host>:5300/mcp
```

Transport: **streamable HTTP** (stateless, JSON responses). Same host/port as
the web UI and HTTP API.

## Authentication

Reuses the same API keys as the HTTP API. Send either header:

```
X-API-Key: <api-key>
# or
Authorization: Bearer <api-key>
```

Two kinds of key are accepted:

1. **Web-UI key** — created in the web UI (sidebar → API Keys), prefixed `lbk_`.
   The secret is shown once; only its SHA-256 hash is stored. Each key is bound
   to one Workspace and has explicit scopes, status, optional expiry, and
   last-used metadata. The key determines the Workspace; callers cannot switch
   it with `X-Workspace-Id`.
2. **Global API key** — set in `data/config.yaml` under `api.global_api_key`.
   Requires no login session and no DB record; does not need the `lbk_` prefix.
   It is accepted only by a community instance with exactly one local
   Workspace and is disabled for SaaS multi-Workspace operation. Leave empty to
   disable. See the `langbot-deploy` skill for config details.

Invalid, revoked, or expired keys get `401 Unauthorized`. A valid key whose
scopes do not authorize a tool gets `403 Forbidden`.

To inspect key identity and permissions, call `GET /api/v1/system/context` with the API key.

## Client configuration

```json
{
  "mcpServers": {
    "langbot": {
      "url": "http://<langbot-host>:5300/mcp",
      "headers": { "X-API-Key": "<api-key>" }
    }
  }
}
```

## Tool surface

Slack quick setup: create a disabled `slack-omni` bot draft first, then use
`start_slack_setup` with the user's App Configuration access/refresh tokens.
Choose `socket_mode=true` with a browser-reachable OAuth `redirect_url`, or
provide the public HTTPS `webhook_url` ending in `/bots/<bot_uuid>`.
Poll `get_slack_setup_status` for the Slack installation authorization URL;
the user must authorize installation. On success, apply the returned `config`
using the normal bot update flow. Socket Mode also requires a separately
generated `app_token` (`xapp-`, scope `connections:write`). Never log tokens.
`cancel_slack_setup` removes the temporary session without deleting the Slack
application. Sessions expire after 15 minutes and are bound to the initiating
Workspace, principal, and placement generation. Restarting a failed setup can
create another Slack application; inspect the returned `app_id` first.

The tools wrap the LangBot service layer. Current tools (v1):

| Tool | Purpose |
| --- | --- |
| `get_system_info` | Version, edition, instance id |
| `list_bots` / `get_bot` / `create_bot` / `update_bot` / `delete_bot` | Manage messaging-platform bots (secrets redacted on read) |
| `list_bot_event_route_statuses` | Inspect bot event-route runtime status |
| `list_processors` / `get_processor` / `create_processor` / `update_processor` / `delete_processor` | Manage the peer Agent, Pipeline and Event processor types |
| `get_processor_metadata` | Discover installed event-capable Runner components, schemas and supported event patterns. |
| `list_processor_runs` / `get_processor_run_events` | Read one Agent or plugin processor run history and logs; paginate with `before_id` / `after_sequence`. |
| `debug_agent` | Execute a synthetic Agent event (`processor_uuid`, `payload`); requires `runtime.operate`. Returns final text and up to 1000 execution events (thinking, text, tool arguments/results). Platform tools use Mock; other configured tools execute normally. Optional `payload.mock`: `errors`/`results` keyed by platform tool name, `unsupported_apis` lists unavailable platform APIs. |
| `list_pipelines` / `get_pipeline` / `create_pipeline` / `update_pipeline` / `delete_pipeline` | Manage pipelines |
| `list_llm_models` / `get_llm_model` / `list_embedding_models` / `list_model_providers` | Inspect models & providers |
| `list_knowledge_bases` / `get_knowledge_base` / `retrieve_knowledge_base` | RAG knowledge bases (incl. semantic search) |
| `list_mcp_servers` | External MCP servers LangBot connects to (as a client) |
| `list_skills` / `get_skill` | Installed skills |
| `list_knowledge_engines` / `get_knowledge_engine_schema` / `list_knowledge_parsers` | Discover RAG configuration |
| `get_pipeline_extensions` / `update_pipeline_extensions` | Read or completely replace extension bindings; all lists and switches required |
| `run_pipeline` | One fresh-session turn; requires `runtime.operate`, executes configured models/tools, never auto-retry an unknown outcome |
| `get_monitoring_records` / `get_monitoring_details` | Bounded Workspace records and existing message/session details |
| `get_sandbox_diagnostics` | Read status (`resource.view`), sessions/errors (`audit.view`); managed sandbox admission still applies |

Mutating tools (`create_*`, `update_*`) take a JSON object matching the same
shape as the corresponding HTTP API request body. Discover resources with the
`list_*` / `get_*` tools before mutating; identifiers are UUIDs. Reads require
`resource.view`; mutations require `resource.manage`. All service calls inherit
the immutable Workspace context authenticated at the MCP transport boundary.
Pass `is_default: true` to `create_pipeline` only when the Workspace does not
already have a default pipeline.

## How to use

1. Get an API key (web UI key, or set `api.global_api_key` in config.yaml).
2. Point your MCP client at `http://<host>:5300/mcp` with the key header.
3. Call `get_system_info` to confirm connectivity.
4. Use `list_*` tools to discover, then `get_*` / `create_*` / `update_*` /
   `delete_*` as needed.

## ChatGPT / Codex subscription providers

`list_model_providers` can return the `openai-codex` requester. Its OAuth
credentials are server-only and are not provider API keys. Never ask a user
to paste ChatGPT access tokens, refresh tokens, or a Codex auth cache into an
MCP tool or model configuration.

A human connects or disconnects the subscription through **Models → provider
settings** in the LangBot web UI. The provider-scoped `/codex/*` authentication
routes deliberately require a browser-user session and are not exposed as MCP
tools or authorized by a LangBot API key. Once connected, models are managed
and selected through the normal provider/model workflow. A disconnected
provider must be reauthorized; do not silently replace it with API-key billing.

See [ChatGPT / Codex subscription](../../../docs/CODEX_SUBSCRIPTION.md) for setup,
usage limits, and the personal-account versus shared-service boundary.

## Provider deletion

The curated MCP surface currently lists providers but has no provider-deletion
tool. In the web UI, **Edit Provider → Delete** asks for confirmation before
removing that provider and all its LLM, embedding, and rerank models. This is
irreversible; never interpret a request to edit a provider as authorization to
delete it.

The equivalent HTTP operation is
`DELETE /api/v1/provider/providers/{uuid}?cascade=true`, requiring
`resource.manage` in the authenticated Workspace. Omitting `cascade` preserves
the existing refusal to delete providers that still have models. Cloud-managed
providers remain protected. Cascade deletion removes stored Codex authorization
state as well; it is not the same operation as disconnecting an account.

## Implementation & maintenance (for LangBot developers)

- Server: `src/langbot/pkg/api/mcp/server.py` (FastMCP). Tools call the service
  layer directly, so the MCP surface stays aligned with the API.
- Mount: `src/langbot/pkg/api/mcp/mount.py` — an ASGI dispatcher fronting Quart,
  authenticating `/mcp` requests, running the streamable-HTTP session manager.
- Smoke test: `tests/manual/mcp_smoke.py`.

> When you add, remove, or change an HTTP API endpoint that should be
> agent-accessible, update the corresponding MCP tool **and** this skill. The
> MCP tool surface and the API must stay aligned (see `AGENTS.md`).

## Pitfalls

- `/mcp` is the **server** LangBot exposes. The `/api/v1/mcp` routes are the
  **client** side (managing external MCP servers LangBot connects to). Don't
  confuse them.
- A `401` means the key is wrong, missing, revoked, expired, or (for the global
  key) `api.global_api_key` is empty or the instance is not an OSS singleton.
- A `403` means the key is valid but lacks the permission required by the tool.
- The global key is plaintext in config.yaml — only enable it on trusted/internal
  deployments and serve over HTTPS.

## Event processors

Create a processor with `kind: "event_processor"` and basic information. Without
a component it supports no events. Discover installed components with
`get_processor_metadata`, then use `update_processor` with `component_ref` and
optional `parameters`. API callers may also supply these when creating an instance.
Bind an instance by updating the bot's `plugin_processors` array with
`{"processor_uuid": "<instance UUID>", "enabled": true}`. This replaces the full
subscription list; preserve bindings you want to keep. Do not add plugin processors
to `event_bindings`, which remains exclusive Agent/Pipeline routing.
Each enabled subscription independently receives the installed Runner's declared
events. Slow or failed subscribers do not prevent other subscribers or the primary
route from executing. Installation alone never activates a handler. Reusing an
instance shares its configuration and runtime state. Use a separate instance for
independent settings. Optional plugin behavior belongs in the Runner config schema.
`debug_agent` accepts the complete typed event in `payload.data` for this kind.
Legacy EventListener plugins remain in the Pipeline lifecycle.

`list_processor_runs` includes `created_at_ms`, `started_at_ms`, and
`finished_at_ms`: Host lifecycle times in epoch milliseconds. Use the start and finish times for elapsed processing time; select a run and call `get_processor_run_events` for its
logs and action results. These times are not internal plugin profiling data.

## Unified execution monitoring

Use `get_inflight_executions` for a bounded current-workspace snapshot of active
and recently started executions, including `progress_event`. Progress is a
reported stage, not an estimated completion percentage. The UI uses the shared
`GET /api/v1/monitoring/in-flight/stream` SSE feed instead of polling per viewer.

Use `get_monitoring_executions` for the execution list and
its legacy `pipeline_ids` parameter to filter any processor kind (Agent,
Pipeline or event processor); the summary uses the same processor scope. Use
`get_monitoring_execution_detail` with `source=auto` to resolve a run,
message or event identifier outside the current list page. The detail exposes
`inputs`, `outputs` (generated content), `deliveries` (recorded platform sends),
`events`, `llm_calls`, `tool_calls`, `errors`, `related`, and `conversation` in
`pages`. Follow each section's `has_more` and `next_offset` independently.
Conversation history supplies context; historical messages without explicit
links must not be asserted to belong to the selected execution. Events without
a processor run use `source=event`. All lookups remain Workspace-scoped.

Monitoring record filters accept `mode` (`all`, `real`, `debug`) and
`execution_statuses` (normalized execution statuses). These select the owning
execution, not the individual model/tool call outcome. Calls without a recorded
execution link are excluded when an execution filter is active.

### Workspace default LLM model

`get_starred_model` reads the Workspace-wide favorite. `set_starred_model`
requires `provider_secret.manage` and replaces the single starred model; pass
`null` to clear it. The model must belong to the current Workspace.
`get_default_model` resolves the favorite first, then the Space wizard chat
recommendation only when LangBot Models is enabled and the Workspace owner is
bound to a LangBot Account. It returns a nullable `uuid`.
New processor LLM selector defaults use this preference; existing configurations
are not rewritten. Embedding and rerank models are not eligible.

### Reset a bot session context

Use `reset_session_context(bot_id, session_id)` only when a user asks to start a session afresh. It requires `resource.manage`, preserves monitoring records, and refuses sessions with active tasks. It clears conversation runner state and excludes earlier transcript entries from subsequent model context. Files and long-term memory are not removed.