Fix every MCP tool call failing: drop fastmcp 3.x include= kwarg

[garyslamb]

Problem

Every tool call to the deployed AgentMCP server returns a generic {"error": "internal error", "correlation_id": ...}. CloudWatch (/ecs/AgentMCP) shows the real cause:

TypeError: get_http_headers() got an unexpected keyword argument 'include'
  File "/app/server_remote.py", line 189, in utils
    headers = get_http_headers(include={"authorization"})
RuntimeError: Error initializing mcp_utils

utils() throws on its first line in the OAuth branch — before any tenant/user resolution — so every tool call fails identically.

Root cause

get_http_headers() strips the authorization header by default. The include= kwarg used to recover it only exists in fastmcp 3.x, but pyproject.toml pins fastmcp==2.12.4, which is what CI (buildspec.yml regenerates the lock from pyproject on each build) installs and deploys. Local dev drifted to fastmcp 3.2.4 where include= exists, so the bug never reproduced locally — only in the container.

Fix

Read the bearer token directly from get_http_request().headers, which works on 2.12.4 and 3.x alike. The non-authorization x-inmydata-* headers are not stripped by get_http_headers(), so the no-arg call still serves them. Version-agnostic, minimal, keeps the proven pinned runtime.

Validation

• python -m py_compile server_remote.py passes.
• No tests assert on get_http_headers / include=.
• CI runs the pytest gate in buildspec.yml pre-build before the image is built.

Deployment path

Merge into Development, then merge Development → Production to trigger the ECS build/deploy.

🤖 Generated with Claude Code