enabled and shared were hand-maintained in 24 roles and wrong in both
directions. Both now resolve from the mcp_consumer edges already declared
in meta/services.yml: a server takes the consumers it admits, a client
takes the servers that admit it, and the pair renders as "'peer' in
group_names or ...", or False when no peer is admitted at all. setdefault
keeps meta/mcp.yml and meta/variants.yml as the override channel, so
pinning either key still wins.
The resolved block replaces the mapping instead of being written into it.
_build_role_base_config parks the YAML cache's own object under mcp, so an
in-place setdefault injected the derived keys into every later raw read and
made test_mcp_schema pass alone but fail in a directory run.
The derivation keys on peer presence, never on a peer's own value: a
re-entrant read under _RENDER_GUARD returns the unrendered dict.
Four lints now ask the resolver instead of reading meta/mcp.yml, which they
could not do while the key was hand-written. That is what exposed the eleven
missing hostile-path specs the previous commit closed.
Carries one change that belongs to the WordPress probe but shares a file
with this one: the tool allowlist moves to the hyphenated names the adapter
actually serves.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
f5272fa85f derived the 404 from mcp.endpoint.path, which for an
adapter-fronted provider names the sidecar. Mattermost declares /mcp
there and answers on /plugins/mattermost-ai/mcp-server/mcp, so the proxy
blocked a path the application never served while the native surface
stayed reachable. Baserow passed only because its two paths coincide -
one role agreeing proved nothing about the other four.
That surface is what the adapter exists to narrow: it serves four tools
out of fourteen, and the native path reaches all fourteen.
adapter.upstream_path joins upstream_network and upstream_transport in
meta, and the four roles whose upstream lives on their own vhost declare
it there. Gitea does not: its upstream is a separate sidecar on its own
network, so it has nothing to hide on the application's vhost, and the
absence says that.
The roles read the value back through lookup('config', ...) rather than
keeping a second copy, so the path is stated once.
The template now separates the two roles the old variable conflated:
endpoint.path is what gets served, and only where the surface is public
and enabled; every declared path that differs from it gets a 404. Three
tests pin the distinction rather than the outcome - mattermost's two
paths must differ, gitea must declare none, and a passthrough provider
must say where its upstream lives.
Baserow's image mounts the MCP app on the ASGI root unconditionally, so
mcp.enabled only decides whether an endpoint record exists. The
application's own vhost kept routing /mcp/*: switched off it answered
401 Endpoint not found., and a refused credential is still a surface.
Switched on it is worse - the adapter narrows fourteen upstream tools to
four, and the publicly routed native path reaches all fourteen for
anyone holding the endpoint key. web-app-homeassistant had the same
shape, an exposure: internal surface reachable publicly. Both now 404
there and stay reachable on the container network.
The public surfaces get the edge limits the contract already declared.
Zones are written per role by the role that owns them, in the shape
web-app-prometheus uses, because one round-scoped file would drop another
application's zones on the next deploy. The rate is concurrent_requests
per second rather than an eighth limit key: a client allowed N in flight,
each bounded by timeout_seconds, cannot sustain more unless every call
returns instantly. A refusal is 429, not nginx's 503, because a client
that should back off must not read it as an outage. stream_seconds
finally binds something - the adapter holds no stream, the proxy does.
The shared location snippet's three timeouts become parameters defaulting
to the 900s they hard-coded, so no existing vhost changes.
Found by the disabled-state assertion 7d8e7e87ff added, which had never
run: its helper was never staged, so the two defects hid each other.
kevinveenbirkenbachandClaude Opus 5