Files
computer-playbook/roles/web-app-openwebui/meta/mcp.yml
kevinveenbirkenbachandClaude Opus 5 3db5820b6e fix(n8n): serve the MCP trigger over Streamable HTTP on 1.100.1 so Open WebUI can connect
Run 34421944328 n8n#1: Open WebUI 0.11.0 ships only a Streamable HTTP
MCP client. n8n 1.95.3's MCP Server Trigger speaks SSE only and answered
the client's POST to /webhook/infinito-mcp/sse with 404, so "every
registered MCP server answers Open WebUI's client" failed.

n8n moves to 1.100.1 and the managed trigger to typeVersion 2, which
serves Streamable HTTP at /mcp/<path>. meta/mcp.yml declares
transport: streamable_http at /mcp/infinito-mcp (the trigger path stays
infinito-mcp) and points source_url at the 1.100.1 tree. Open WebUI's
supported_transports drops sse, which its client never spoke; no
provider declares sse any more, so no pairing is lost.

n8n#0: the guest spec probed ${APP_BASE_URL}${MCP_ENDPOINT_PATH} and
expected a refusal of >= 300 without an event stream. The trigger is
exposure: internal, so the public vhost must answer 404; the spec now
asserts exactly that through mcpEndpointUrl(..., N8N_BASE_URL), and the
bearer guard itself is proven in-cluster by the CLI MCP contract.

Requirement 035 and the MCP audit table follow the version and
transport.

Upgrade path, read from upstream at both tags: the postgres migrations
are identical (45/45) and the only new common migration is
AddProjectDescriptionColumn, an additive nullable column; BREAKING-
CHANGES.md lists only 1.98.0 in range (route metric format, Form node
tag attributes, Node >= 20), none of which this deployment uses. A fresh
1.100.1 install ran all 89 migrations and passed the MCP bridge, server,
non-member and guest specs locally.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-09-11 12:20:46 +02:00

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YAML

---
classification: native_client
direction: client
source_url: https://docs.openwebui.com/features/extensibility/mcp/
implementation: native
supported_transports:
- streamable_http
supported_auths:
- bearer_token
- app_password
- upstream_session
tools:
read_only_default: true
mutating_tools_enabled: false