---
title: "Agent: invoke a tool on an MCP server"
method: POST
path: "/api/v1/mcp/internal/tools/call"
tags: ["MCP"]
---

# Agent: invoke a tool on an MCP server

`POST /api/v1/mcp/internal/tools/call`

Agent: invoke a tool on an MCP server.

Auth: Required (bearer token).
Scope: Organization-scoped in authenticated context.
Side effects: May mutate server state.

## Headers

- `Accept` string

## Response `200`

OK

- Response — Response schema
  - `data` unknown
  - `message` string
  - `status` string

## Other responses

- `400` — Bad Request _(validation or deserialization error)_
- `500` — Internal Server Error _(panics)_
- `default`

## Changes

- **2026-04-26** `09f18af670c4` — 2 breaking, 4 info
  - the request property `server_id` became required
  - the request property `tool_name` became required
  - api tag `MCP` added
  - api tag `api/v1/mcp` removed
  - …2 more
- **2026-04-06** `6d5e3b7979d1` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/nixopus/apis/openapi/changes/api/v1/mcp/internal/tools/call/post.md)

---

[API](https://skmtc.dev/nixopus/apis/openapi.md) · [All operations](https://skmtc.dev/nixopus/apis/openapi/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/nixopus/openapi/revisions/c5bacaea7239/schema)