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Keep persisted conformance runs behind the pinned egress guard (MJ-001) - #5459
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runConformance's protocol suite rebuilt its config from the server's URL, token and headers only, so a fetch attached to the server config never reached it and MCPConformanceTest fell back to the global fetch. The apps and tasks suites of the same run connected through the caller's fetch; this one, raw probes and MCP client alike, followed redirects wherever they led. A hosted caller that guarded the server config had therefore guarded two of the three suites. The protocol suite now adopts server.fetchFn, then server.baseFetch, as its own fetchFn. It is applied after the protocol spread so an explicit fetchFn: undefined cannot unset it, and a real protocol.fetchFn still wins. Callers that attach no fetch (the CLI) are unaffected. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Xjc8uLMHU952pqKaowF2LA
Persisted conformance runs dial a URL somebody else chose: a saved
server, a sandbox running a pull request's code, a benchmarked
connector. The benchmark and GitHub-check workers handed the executor a
bare { url }, so every suite dialled through the global fetch, with no
address classification and redirects followed unchecked. The /v1 start
route did attach the pinned guard, but the protocol suite dropped it
(fixed in the previous commit).
The executor is now the chokepoint for all three callers:
- It defaults the MCP and OAuth transports to the hosted conformance
guard when the caller passes none. A deliberate transport still wins.
Both workers now pass the guard explicitly as well.
- It judges the starting URL with the same check the routes use, and a
refused target is never handed to a suite. Each suite records the
refusal as its could-not-run reason. The up-front check matters for
the protocol suite's localhost host-header checks, which open raw
node:http sockets that no fetch can guard.
- Every transport is wrapped so that a rejected dial reaches the stored
report as the guard's verdict without its cause, or as the doctor's
uniform connection message. Before this, the report serializer copied
the refusal's cause, which carries the address a hostname resolved
to, and socket, TLS and DNS error text.
The GitHub-check health probe also dials the pull request's server
through the hosted MCP transport instead of the global fetch. The
sandbox URL is E2B's public HTTPS edge, and the eval half of the check
already reaches it through the same pinned transport, so it needs no
allowance.
All of this is a no-op outside hosted mode.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Xjc8uLMHU952pqKaowF2LA
The hosted-manager guard only saw `new MCPClientManager`. runConformance, the conformance suites, withEphemeralClient, the probe and the doctor each open their own connection through a fetch seam that is the global fetch unless filled. The persisted conformance path went through exactly that gap while the first rule was green. The script now also scans server/routes/shared, and a hosted file that statically imports one of those entry points from @mcpjam/sdk must be on a second allowlist. Each entry names the guard the file dials through, and that guard must still appear in the file. A new importer fails by existing, a namespace import of the SDK is refused outright, and stale entries fail as they do for the first rule. The header states what a source scan cannot see (dynamic imports, per-call arguments) and points at the runtime tests that cover it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Xjc8uLMHU952pqKaowF2LA
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Included review availability: Your plan provides up to 8 included reviews per hour; 2 remain after this review. WalkthroughThe SDK protocol suite now uses the fetch configured on the server, unless a defined Merge Risk: ⚪ Minimal · up to No actionable merge-blocking issue is established by the supplied evidence. Merge after normal checks. Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Inline comments:
In `@mcpjam-inspector/scripts/check-hosted-manager-base-fetch.mjs`:
- Around line 136-141: Update the guard pattern in the executor rule within the
hosted-manager base-fetch check to match the
`guardPersistedConformanceTransport` call assigned to `guarded`, not the
function definition. Anchor the pattern on the assignment so removing the call
from `executePersistedConformanceRun` causes the check to fail.
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.changeset/persisted-conformance-egress-guard.mdmcpjam-inspector/scripts/check-hosted-manager-base-fetch.mjsmcpjam-inspector/server/services/__tests__/conformance-run-executor-egress.test.tsmcpjam-inspector/server/services/__tests__/conformance-worker-egress.test.tsmcpjam-inspector/server/services/bench-worker.tsmcpjam-inspector/server/services/conformance-run-executor.tsmcpjam-inspector/server/services/github-checks-worker.tsmcpjam-inspector/server/services/github-checks/__tests__/sandbox-health-egress.test.tsmcpjam-inspector/server/services/github-checks/sandbox.tsmcpjam-inspector/server/utils/__tests__/hosted-transport-failure-redaction.test.tsmcpjam-inspector/server/utils/hosted-doctor-redaction.tsmcpjam-inspector/server/utils/hosted-transport-failure-redaction.tssdk/src/conformance-run.tssdk/tests/conformance-run.test.ts
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Inspector Tests 4/6 failed in one test: I don't think this PR caused it:
There's no existing fix to port. I'm re-running the failed job once; if it fails again, I'll treat it as real and investigate. Generated by Claude Code |
The rule for `conformance-run-executor.ts` matched a bare `guardPersistedConformanceTransport(`, and that file also DEFINES the guard. The definition satisfied the pattern on its own, so deleting the call site at `:470` and passing `args.server` straight to `runConformance` left CI green — the exact MJ-001 regression this rule exists to catch. Anchoring on the assignment makes the pattern satisfiable only by a call. Verified both ways: the script passes as-is, and removing the call site now fails it with the rule's own message.
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Why
MJ-001 is about the hosted server dialling user-chosen URLs without the egress guard. #4783 and #4884 closed it for the doctor, validate, tools and every
MCPClientManagerfactory, but persisted conformance runs still had the same hole:runConformancea bare{ url }. Every suite dialled through the globalfetch, with no address classification and redirects followed unchecked./v1start route did attach the pinned guard, but the SDK's protocol suite dropped it.node:httpsockets whenever the target is a loopback name, so no fetch can guard them.cause, which holds the address a hostname resolved to.What changes
SDK (
sdk/src/conformance-run.ts)fetchFnfrom the server config (fetchFn, thenbaseFetch), as the apps and tasks suites already did. Its raw probes and its MCP client both use that fetch.protocol.fetchFnstill wins, and an explicitfetchFn: undefinedcannot unset the server's fetch.fetchFn. The one exception is the localhost host-header checks, which use rawnode:http(s); the executor handles them (see below).Inspector executor (
services/conformance-run-executor.ts) — the one path every persisted run goes throughguardPersistedConformanceTransportsets the MCP and OAuth transports tocreateConformanceFetchwhen the caller passes none. A deliberate caller transport still wins, the same rule ascreateAuthorizedManager.persistedConformanceTargetRefusalchecks the starting URL with the same check the routes use (assertAllowedHostedTargetUrl). A refused target is never handed to a suite. Each suite is stored as could-not-run with the refusal's own message as the reason. This is the only thing that stops the raw-socket localhost checks.utils/hosted-transport-failure-redaction.ts, which only changes rejected fetches:cause.hosted-doctor-redaction.tswith a one-word change. I did not touchisEgressRefusalDetail(Close the two disclosed MJ-001 residuals #5447).Workers
baseFetch: createConformanceFetch("MCP server")explicitly, and each gets a test-only export.buildAndStartnow defaults tohostedMcpBaseFetch()instead of the globalfetch. The PR's code answers that probe and can redirect.GitHub-checks sandbox target: no allowance needed.
https://<port>-<id>.e2b.app/..., E2B's public HTTPS edge.*.e2b.appresolves to a public address, and the repo has noE2B_DOMAINoverride.createAuthorizedManager) since Put every hosted MCP connection behind the pinned egress guard (MJ-001) #4783.CI guard (
scripts/check-hosted-manager-base-fetch.mjs)server/routes/shared.@mcpjam/sdkentry point (runConformance, the four conformance suites,withEphemeralClient,probeMcpServer,runServerDoctor,discoverOAuthServerInfo, the readiness gatherers). Such a file must be on an allowlist that names the guard it dials through, and that guard must still appear in the file.Before / after (hosted mode)
/v1persisted run, protocol suitefetch: redirects followed uncheckedfetchcause(resolved address)fetchRollout
HOSTED_MODE, so local, desktop and CLI behaviour is unchanged. The CLI attaches no fetch, so the SDK change doesn't affect it.@mcpjam/sdkand@mcpjam/inspectoras patch releases. No flags or migrations./v1route already refused it) now finalizes with could-not-run suites instead of dialling.server_unhealthyrate and GitHub-check conformance outcomes (both now use the pinned transport).BENCHMARK_RUNS_ENABLED.Tests and validation
npx vitest run tests/conformance-run.test.tsinsdk/: 13/13. The new cases cover the client path, the raw-probe path,fetchFnoverbaseFetch, an explicit override, and an explicitundefined.npx vitest run --project server --maxWorkers=2over 14 files: 388/388 passed. The files were: conformance-run-executor (existing), conformance-run-executor-egress (new), conformance-worker-egress (new), v1 conformance-runs, bench-worker, bench-worker-pillar-children, github-checks-worker, github-checks sandbox, sandbox-health-egress (new), resolve-and-start, hosted-doctor-redaction, hosted-transport-failure-redaction (new), hosted-mcp-base-fetch, hosted-manager-base-fetch.{ url }run never touches the globalfetch.fetchcalls.fetchcalls.npm run test:checks(repo root, ripgrep present): exit 0. I also checked by hand that the new rule flags plain, aliased and namespace imports, ignorestype-only imports, and flags an allowlisted file that loses its guard.npm run typecheck -w @mcpjam/sdk: exit 0.tsc --noEmit -p mcpjam-inspector/server/tsconfig.json: no errors in any file this PR adds or any line it changes. The project is not clean onmain(347 errors in unrelated code, including three pre-existing lines ingithub-checks-worker.ts).prettier --checkonmain: the SDK source uses trailing commas its config doesn't want, and the inspector files omit trailing commas their config wants. I left them alone; my hunks follow each file's existing style.main, none new. The inspector eslint config only coversserver/routes/web/**; the.mjslints clean.Not covered / follow-ups
/api/web/conformance/*routes: they return suite results straight to the caller without this wrapper. They check the start URL first, but a redirect-hop refusal's serializedcausecould still carry the resolved address. Worth either strippingcausewhere the pinned fetch classifies errors, or wrappingcreateConformanceFetchitself.isEgressRefusalDetailand the bench scorecard'sdiscoveryError; this PR doesn't touch either.captureTaskRequestHeaderstemporarily replacesglobalThis.fetchfor the whole process. In a multi-tenant hosted process that is a cross-request hazard. I noticed it during the audit and did not change it./v1route's own start-URL check now overlaps the executor's. I kept it because it answers 400/503 before a run row exists.🤖 Generated with Claude Code
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Note
High Risk
Touches hosted egress, redirect validation, and persisted conformance/GitHub-check paths; behavior changes for refused targets and stored error text, though scoped to HOSTED_MODE with broad tests.
Overview
Closes the remaining MJ-001 gap: hosted persisted conformance runs no longer dial user-chosen URLs through unguarded
globalThis.fetch.In
@mcpjam/sdk,runConformance's protocol suite now inherits the server config transport (fetchFn, thenbaseFetch) for both MCP client and raw probes, matching apps/tasks; explicitprotocol.fetchFnstill overrides.In the inspector,
executePersistedConformanceRunis the chokepoint:guardPersistedConformanceTransportdefaults MCP/OAuth tocreateConformanceFetchwhen callers pass none (callers' transports still win),persistedConformanceTargetRefusalblocks disallowed targets before any suite runs (including raw-socket localhost host-header checks), andredactHostedTransportFailuressanitizes failed dials in stored reports. Benchmark and GitHub-checks workers now pass guardedbaseFetchexplicitly; the GitHub sandbox health probe defaults tohostedMcpBaseFetch().CI extends
check-hosted-manager-base-fetch.mjswith a second rule: hosted imports of self-dialing SDK entry points must be allowlisted with a named guard;server/routes/sharedis in scope. All of this is no-op outside hosted mode.Reviewed by Cursor Bugbot for commit 4bc1718. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by cubic
Closes MJ-001's remaining egress hole: persisted conformance runs now dial through the pinned host guard whoever started them, and targets the guard refuses are never dialled at all.
/v1route, benchmark worker, and GitHub-checks worker) dials MCP and OAuth traffic through the hosted conformance guard; a caller's own transport still wins.fetchFn/baseFetchinstead of the globalfetch, covering its raw probes and MCP client, unless an explicitprotocol.fetchFnoverrides it.fetch.@mcpjam/sdkentry points without a named guard, and its rule for the executor is anchored on the guard's call site so removing the call fails CI.Everything is a no-op outside hosted mode, so local, desktop, and CLI behavior is unchanged.
Written for commit 4bc1718. Summary will update on new commits.