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exercise-wire: a wire-parity check that fails on #1355, #1515 and #1546 today #1555
Description
Mission #1552's exercise is green today while three of its bugs are live, so it can't tell the mission's progress.
Baseline @ 6d743af3: make testconf-stateless 30/0, make testconf-agents 28/28 and 4/4. Neither drives what the bugs need:
- stateless: five handlers still skip the middleware chain (C7 divergence) #1355: no middleware gate on the stateless wire, so the five unrouted handlers pass.
- stateless: tools/list leaks x-mcp-file to clients that did not declare fileInputs #1515: no stateless client without
fileInputs, so thex-mcp-fileleak is never seen. - ttlMs is omitted by default where the 2026-07-28 draft makes it required #1546: the agents fixture sets
ttlMs, so its absence by default is never seen. Base list methods aren't graded for it at all.
Work
- A wire-parity check that sends the same request over both wires, with a scope-gating middleware and a client that declares no
fileInputs, and compares what each wire does.TestStatelessWireParityinexperimental/ext/agentsis the precedent for the comparison. - A check that every
CacheableResultcarriesttlMson a server configured with no TTL. - A
make exercise-wiretarget running those checks plustestconf testconf-stateless testconf-agents, logged on Mission: a 2026-07-28 client gets spec-correct results from mcpkit on both wires #1552.
Done when
make exercise-wire exists and fails today on #1355, #1515 and #1546, each row naming its ticket.
Activity
panyam commentedon Oct 18, 2026
Adding a row to this from #1562 (which closes with the icons work):
exercise-wireshould check thatinstructionssits at the top level of the initialize result and of theserver/discoverresult, and never insideserverInfoor the_metaserverInfo. That was #1560, and it lived through every suite because nothing graded it. Once the row exists, the same check is worth proposing upstream inmodelcontextprotocol/conformance, since their harness readsgetInstructions()without asserting on it.