MCP Adapter 0.7.0 for WordPress refuses a request that follows
initialize without the MCP-Protocol-Version header: 'Invalid Request:
MCP-Protocol-Version header is required for a 2025-06-18 session'. The
contract probe never sent it, so the CLI test of web-app-wordpress
failed at tools/list.
The probe now keeps the version the server answers initialize with and
sends it on every later request of the streamable HTTP transport, which
the specification asks of a client since 2025-06-18.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Of the 76 open code scanning alerts, 39 point at code that can change.
svc-ai-mcp-adapter:
- A path argument that is empty or made only of dots is refused.
Percent-encoding keeps a separator inside its segment, but "." and ".."
need none, so an upstream that resolves dot segments could answer from a
path the contract does not name.
- parse_duration splits on the units. The pattern it used before rescanned
a long run of digits from every start position.
Tests and the README generators:
- Every Jinja environment built with autoescape=False and a "noqa: S701"
uses select_autoescape now, as six test modules and
utils/templating/jinja.py already did. It escapes templates named
*.html, *.htm and *.xml, which none of these call sites loads.
- Dead code goes: a doubled "rel" block in the email lint, an unread
_SKIP_DIRS, and a module that _resolve returned to no caller.
- Two "except ...: pass" blocks become contextlib.suppress and
assertRaises.
- Nine test modules import unittest.mock one way instead of two, and one
lookup test imports its module once.
Closes#807
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A client reaches the MCP endpoint by the provider's service name on the
container network, so the hop is plain HTTP. WordPress hands out an application
password only over SSL and, on an onion deployment, home_url() is
http://<onion>, so the gate stays shut: core never even attempts to validate the
credential and answers rest_not_logged_in. The client learns nothing about why.
Measured on a live deployment, same credential, same endpoint, the only
difference being the declaration of the scheme: 401 without it, 200 with it.
Deliberately wrong passwords produced the same rest_not_logged_in as correct
ones, which is what "never validated" looks like from outside.
The accommodation belongs on the provider's side, as 5e810c4a5a already settled
for Moodle: a probe that spoofs Host and X-Forwarded-Proto asserts the endpoint
works when spoofed and says nothing about how a real client reaches it. That is
exactly what happened here - the contract test sent the header and passed while
hermes and openclaw, which send only their Authorization, were refused in run
34699757369 on both compose and swarm.
WORDPRESS_INTERNAL_HOST is rendered from the same mcp.endpoint.service_key the
clients build their URL from, so both sides name one thing once. The filter
opens the gate for a request whose HTTP_HOST matches it, splits on ':' so a port
cannot defeat the match, and changes nothing when the variable is unset. Its
existing branches are untouched.
contract.py loses the X-Forwarded-Proto it used to send. The test now takes the
route a client takes, and can no longer be green while every client fails.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Over streamable_http the contract probe judged initialize, tools/list and the
read call by HTTP status alone. A server that answers 200 with a JSON-RPC
`error` object therefore passed initialize and the read call, and failed
tools/list only as "server serves []", which names the wrong cause. The SSE
path checked initialize and the read call, but not tools/list. mcp-adapter,
which fronts WordPress, maps invalid params to 200, and Moodle's
webservice_mcp answers a failing tool call with 200 and code -32603, so a read
that returned nothing could turn the check green.
rpc_error() extracts the error object of a JSON-RPC body, refused() is built
on it, and reject_error() fails initialize, tools/list and the read call on
both transports with the server's own message. A 200 whose body is not JSON
still carries no error object, so a provider that has not started keeps the
caller retrying as before.
The streamable_http initialize, and the one in the negative probes, sent no
clientInfo, which the MCP SDK requires. Home Assistant (mcp 1.26.0, stateless)
answers such an initialize with 200 and -32602 and serves the rest anyway, so
only the old status check let it pass. All three initialize calls now share one
INITIALIZE with clientInfo, as the SSE path already sent. Against a Home
Assistant-shaped endpoint on mcp 1.26.0 the SDK logs "InitializeRequest.params.
clientInfo Field required" for the old probe, and the fixed one prints OK.
Against HEAD, an error-on-200 at initialize and at the read call printed OK;
now all three steps print REJECTED naming the error. The MCP adapter in front
of sixteen of the nineteen streamable_http providers answers 200 only with a
result (svc-ai-mcp-adapter/files/python/server.py), so none of them changes
outcome.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The contract check ran as an Ansible task in the middle of every provider deploy, and the two client checks ran the same way. A test that is part of the deploy cannot be run without deploying, cannot be re-run on its own, and reports its verdict as a deploy failure. Twenty-seven task files lose 491 lines to this.
It is now what it always was. Each provider ships files/test/test.sh, templates/test.env.j2 and meta/tests.yml, and test-e2e-cli stages one shared harness beside it: run.sh drives contract.sh in a throwaway container on the provider's own network, then isolation.sh for adapter-fronted providers. The read probe each provider offers moved from the calling task into meta/mcp.yml next to the allowlist it must satisfy, and the schema now rejects a read probe naming a tool outside that allowlist.
The bearer the test presents is the one a client resolves through mcp.credential, via the new mcp_client_bearer lookup over resolve_credential, which moved to utils.roles.applications.mcp so it is the same function mcp_servers renders every client connection with. The probe presented whatever the calling role passed, which for the fifteen adapter-fronted providers is a different secret than any client holds.
Sidecar isolation is read from the engine rather than measured inside the container, so it no longer needs a delegation to the node holding the task: attachment is compared by network name, which drops the gwbridge special case, and a swarm worker says it cannot measure instead of skipping silently.
Retrying is bounded by wall clock against MCP_DEADLINE_SECONDS, which scales through the same lookup('timeout') as the harness budget it has to stay under. A flag that is neither true nor false aborts rather than reading as off.
mcp-provider-probe becomes mcp-provider-cli-test: an enabled provider must ship the test rather than include the task. mcp-probe-bearer becomes mcp-adapter-bearer, tying ADAPTER_BEARER to the declared credential key now that no probe include carries it. A new integration test renders the shared env template for every provider through Ansible's own templar, so a later change to it breaks visibly instead of poisoning twenty deploys quietly.
Hermes and OpenClaw keep their client-side proof as CLI tests of their own.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
kevinveenbirkenbach
