Stateful session manager strands Claude Code after a container redeploy:
it reconnects with a now-unknown Mcp-Session-Id, the server 404s, and the
client won't re-initialize on a 404 (claude-code #60949). Stateless makes
each request self-contained (bearer-auth only) so post-deploy reconnect
works without a manual /mcp retry.
FastMCP defaults to an allow-list of localhost variants for the Host
header (DNS-rebinding protection). Any deployment behind a reverse
proxy hitting a non-localhost hostname (e.g. devassistant.traefik.internal)
gets 421 Misdirected Request with:
WARNING mcp.server.transport_security: Invalid Host header: <name>
The protection exists to stop a malicious browser page from rebinding
DNS to attack a localhost MCP server. Our deployment is HTTP transport
behind a reverse proxy with bearer-token auth, which already gates
every request — so the rebinding threat doesn't apply. Disabling
the check lets any Host through; auth still rejects unauthorized
requests at 401.
This also makes the integration test pass without test-only host
hackery — every realistic Host header (Traefik internal hostname,
CDN domain, custom DNS) now reaches FastMCP cleanly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
After fixing the /mcp path forwarding in 1fd303a, requests now reach
FastMCP — but its StreamableHTTPSessionManager raises:
RuntimeError: Task group is not initialized. Make sure to use run().
The session manager owns a task group that must be running before it
can handle requests. In a stand-alone Starlette app this happens via
the `lifespan` parameter (lifespan = session_manager.run). Hosted
inside Quart, my dispatch wrapper only forwards HTTP events, not
lifespan, so the manager never got its startup signal.
Fix: hook session_manager.run() (an async context manager) into
Quart's @app.before_serving and @app.after_serving so the task group
is alive across the serving window.
The CI integration test was hitting the same crash because it drives
app.asgi_app raw without going through Quart's serving lifecycle —
@before_serving never fires. Updated the test to manually enter
session_manager.run() around the request.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The dispatch wrapper was rewriting scope['path'] from '/mcp' to '/'
before handing off to FastMCP. But FastMCP's streamable_http_app
mounts the JSON-RPC handler at '/mcp' (its default), so the rewritten
'/' had no matching route and FastMCP returned 404. Auth middleware
was correctly firing first (a no-auth request still gets 401), the
bug was only on the post-auth path.
Symptom: `claude mcp add ...` succeeds, registration shows in
`claude mcp list`, but connection fails because the initialize
handshake returns 404 instead of an MCP capabilities response.
Fix: pass the scope through unmodified. FastMCP's own routing matches
the '/mcp' path.
Also tightened the integration test that should have caught this —
it was asserting `status != 401`, which a 404 trivially passes. Now
asserts `== 200`, the actual expected response for initialize.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
MCP clients see tools namespaced by the server's local name already
(mcp__<server>__<tool>), so the fable_ prefix on every tool name was
redundant and ate tokens in the model's tool list.
Tools renamed (34 total):
fable_search → search
fable_list_notes / get_note / create_note / update_note / delete_note → list_notes / ...
fable_list_tasks / get_task / create_task / update_task / add_task_log → list_tasks / ...
fable_list_projects / get_project / create_project / update_project → list_projects / ...
fable_list_milestones / create_milestone / update_milestone → list_milestones / ...
fable_list_events / create_event / get_event / update_event / delete_event → list_events / ...
fable_list_tags → list_tags
fable_get_recent → get_recent
fable_list_persons / create_person / update_person → list_persons / ...
fable_list_places / create_place / update_place → list_places / ...
fable_list_lists / create_list / update_list → list_lists / ...
Also rebranded in MCP scope:
FastMCP("fable", ...) → FastMCP("scribe", ...)
auth realm "fable-mcp" → "scribe-mcp"
ASGI scope key fable_user_id → scribe_user_id
ContextVar label fable_mcp_user_id → scribe_mcp_user_id
Tool docstrings "in Fable" / "Fable task" → "in Scribe" / "Scribe task"
Server _INSTRUCTIONS prose
Deliberately kept:
- The internal Python package name `fabledassistant` (per project naming
convention — internal stays).
- "Fabled Scribe" as the official product/brand name (page footer,
smtp_from_name default).
- References to the legacy `fable-mcp/` standalone package in docstrings
explaining what we ported from — accurate until that directory is
deleted in Phase 10.
Client impact: existing MCP registrations need
claude mcp remove <name> && claude mcp add ...
once with a freshly-copied snippet from Settings → MCP Access. Claude
Code then re-discovers tools on connect — old conversations that
referenced fable_* tool names will see "tool not found" on those calls
until updated.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Establishes the tool pattern: each tool module exposes register(mcp),
register_all() aggregates them, build_mcp_server() calls register_all.
fable_search mirrors the existing fable-mcp contract (q/content_type/limit
in; {results, total} out) but calls services.embeddings.semantic_search_notes
directly instead of going over HTTP. User comes from mcp.current_user_id().
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds mcp._context.current_user_id() backed by a ContextVar. The ASGI
auth middleware sets it before dispatching to FastMCP and resets it
on the way out, so tool handlers can read the acting user without
re-parsing the request scope.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Wires FastMCP's streamable-HTTP ASGI sub-app into the Quart app via
asgi_app replacement. Requests under /mcp are stripped, auth-checked
against api_keys, and forwarded to FastMCP with fable_user_id set on
the ASGI scope. All other paths pass through to the original Quart
dispatch unchanged.
Tests cover the three auth paths (no header, invalid token, valid
token) plus a regression check that non-/mcp paths bypass the MCP
dispatch.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Empty FastMCP instance with the post-pivot instructions block. Tools
get registered in phases 2 and 3; ASGI mounting + bearer-auth comes
in task 1.4.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen