Files
windmill/backend/generate_mcp_endpoints_tools
Ruben Fiszel 7d2c5ceb0f fix(flows): make updateFlow body path optional so AI can update flows (#10176)
* fix(mcp): default a body field to its same-named path param so updateFlow works

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* docs: trim mcp path-param fallback helper comment

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* refactor(mcp): keep path params un-mangled so update tools take plain `path`

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(flows): default update_flow body path from URL via EditFlow

Harmonizes updateFlow with the EditVariable/EditResource/EditApp convention: the
flow to update is identified by the URL, so the body path is optional and only
needed to rename. Fixes the 422 at the API layer for every client (MCP, the
in-app AI chat, raw HTTP), not just the MCP tool schema.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* refactor(mcp): drop redundant body-path fallback now that the server defaults it

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* docs: fix stale generator comment after removing mcp body-path fallback

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(flows): mark updateFlow body path optional in the openapi contract

Adds an `EditFlow` schema (path optional) for the update route so the public
contract matches the server; createFlow keeps `OpenFlowWPath` (path required).
Also trims two test comments to record constraints rather than history.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-17 19:22:31 +02:00
..

MCP Tools Generator

The generate_mcp_tools.py script parses the OpenAPI specification and generates Rust code for MCP (Model Context Protocol) tools.

Setup

cd backend/generate_mcp_endpoints_tools
pip install -r requirements.txt

Usage

python3 generate_mcp_tools.py

The script will:

  1. Parse backend/windmill-api/openapi.yaml
  2. Find all endpoints marked with x-mcp-tool: true
  3. Generate backend/windmill-api/src/mcp_tools.rs with a const array of tools

Adding MCP Tools

To mark an endpoint as an MCP tool, add x-mcp-tool: true to the operation in the OpenAPI spec. You can also add x-mcp-instructions to complete the description of the tool with instructions on how to correctly use the endpoint:

/w/{workspace}/scripts/list:
  get:
    x-mcp-tool: true
    x-mcp-instructions: you should call that with this or that arg
    summary: list scripts in workspace
    operationId: listScripts
    # ... rest of endpoint definition