clients: name the unknown config field instead of a 500 that names nothing - #4646
clients: name the unknown config field instead of a 500 that names nothing#4646nachocossio wants to merge 2 commits into
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…thing A caller-supplied client config carrying an unknown top-level key reached Convex verbatim. `hosts:createHost` validates `input` with a strict `v.object`, so the key was rejected at the call boundary before the handler ran, and production Convex redacts that ArgumentValidationError to a bare "Server Error" — leaving `translateConvexWriteError` nothing to report but a generic 500. The caller was told the write failed and never which field failed it. CONVEX-1ZM is what that costs: one caller posted a config with a top-level `initialize` (a real field, but one that only exists at `mcpProfile.initialize`) and retried the identical body five times in three minutes, because nothing in the response said what to change. The write also paged #mcpjam-alerts as a new backend issue for what was caller input. The v1 client write paths now check the caller's config against the key set the write accepts and return a 400 naming the offending keys, plus the real home of a misplaced nested field. Values are never echoed — a config carries `connectionDefaults.headers`. The template branch stays unchecked: a metadata leak there is ours, and a 400 would blame the caller for it. `HOST_CONFIG_INPUT_V2_WIRE_KEYS` lives beside `HARNESS_IDS` in the SDK, with a compile-time guard that fails the build when `HostConfigInputV2` gains a field that is neither on the wire list nor named as a known gap. `oauthProfile` is that gap today: the type declares it and the canonicalizer handles it, but no backend validator or column accepts it. The cost is a deploy-order coupling the old forward-everything behavior did not have — a field the backend validator gains is refused here until the SDK list learns it, so the two have to move together. Fixes CONVEX-1ZM
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. WalkthroughThe SDK now exports the writable host-config key list and verifies alignment with Merge Risk: ⚪ Minimal · up to Client configuration writes now reject unsupported top-level fields with safe, actionable 400 responses before backend writes. No current merge-blocking risk remains. 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/server/routes/v1/clients.ts`:
- Line 490: Remove the ["mrtrModes", "mcpProfile.mrtrModes"] mapping from the
relevant nesting-hints configuration, since HostConfigMcpProfileV1 does not
support that nested field; leave other mappings unchanged.
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mcpjam-inspector/server/routes/v1/__tests__/clients.test.tsmcpjam-inspector/server/routes/v1/clients.tssdk/src/host-config/internal.tssdk/src/host-config/types.ts
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All reported issues were addressed across 4 files
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Re-trigger cubic
Review caught two entries in this branch that a hand-kept list had gotten wrong, so both lists are now checked against their type at compile time rather than by reading. The drift guard only compared the wire list against `HostConfigInputV2` in two directions, so it said nothing about its own known-gap list. A gap whose field was deleted, or one moved onto the wire and left declared, both kept compiling — and closing the `oauthProfile` gap is precisely a move of one key between those two lists. It now also asserts each gap names a real field and is absent from the wire list, which makes a half-done move a build failure. `mrtrModes` was not a field the suggestion map could point at. It exists on the backend's hand-mirrored copy of `HostConfigMcpProfileV1`, which I read, but not on the SDK's, which is the one the canonicalizer enforces. Because `mcpProfile` reaches Convex as `v.any()`, a caller who followed that hint would have had the field silently dropped rather than refused — worse than the error it was meant to explain. The map's keys are now typed `keyof HostConfigMcpProfileV1`, so naming a field the profile does not have stops compiling. `extensions` stays out of the map deliberately, with a note: it is a real profile field, but `clientCapabilities.extensions` is real too and is what the CONVEX-1ZM payload carried, so there is no single home worth suggesting. Verified each guard fails on the case it exists for: adding `oauthProfile` to the wire list while it stays a declared gap, renaming the gap to a field that does not exist, and re-adding the `mrtrModes` entry each break the build, the first and third naming the offending key.
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1 issue found across 2 files (changes from recent commits).
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<file name="mcpjam-inspector/server/routes/v1/clients.ts">
<violation number="1" location="mcpjam-inspector/server/routes/v1/clients.ts:489">
P3: The new comment sentence is grammatically broken: "an entry naming a field `mcpProfile` does not have stops compiling" doesn't parse, and it names `mcpProfile` (a real field) where it means a non-existent field. Reword it so a reader can follow the rationale for the `satisfies` constraint.</violation>
</file>
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Re-trigger cubic
| // interpolate a function into the message. | ||
| // | ||
| // Keys are checked against the SDK's profile type, so an entry naming a field | ||
| // `mcpProfile` does not have stops compiling. `mrtrModes` was exactly that — it |
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P3: The new comment sentence is grammatically broken: "an entry naming a field mcpProfile does not have stops compiling" doesn't parse, and it names mcpProfile (a real field) where it means a non-existent field. Reword it so a reader can follow the rationale for the satisfies constraint.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At mcpjam-inspector/server/routes/v1/clients.ts, line 489:
<comment>The new comment sentence is grammatically broken: "an entry naming a field `mcpProfile` does not have stops compiling" doesn't parse, and it names `mcpProfile` (a real field) where it means a non-existent field. Reword it so a reader can follow the rationale for the `satisfies` constraint.</comment>
<file context>
@@ -483,18 +484,28 @@ const WRITABLE_CONFIG_KEYS: ReadonlySet<string> = new Set(
// interpolate a function into the message.
+//
+// Keys are checked against the SDK's profile type, so an entry naming a field
+// `mcpProfile` does not have stops compiling. `mrtrModes` was exactly that — it
+// exists on the BACKEND's hand-mirrored copy of the type but not on the SDK's,
+// and since `mcpProfile` reaches Convex as `v.any()`, a caller who followed that
</file context>
2 participants
What broke
A caller-supplied client config carrying an unknown top-level key reached Convex verbatim.
hosts:createHostvalidatesinputwith a strictv.object, so the key is rejected at the call boundary before the handler runs — and production Convex redacts thatArgumentValidationErrorto a bare"Server Error", leavingtranslateConvexWriteErrornothing to report but a generic 500.The caller was told the write failed and never which field failed it. In CONVEX-1ZM one caller posted a config with a top-level
initialize— a real field, but one that only exists atmcpProfile.initialize— and retried the identical body five times in three minutes, because nothing in the response said what to change. It also paged #mcpjam-alerts as a new backend issue for what was caller input.The backend validator is correct;
initializeis amcpProfilefield in both repos. Nothing in this repo produces a top-level one — the payload was hand-assembled (nobuiltInToolIds, which every template emits unconditionally and the catalog zod requires).The change
create, the whole-configPATCH, and the deprecated/hostsalias) check the caller's config against the key set the write accepts and return a 400 naming the offending keys, plus the real home of a misplaced nested field.connectionDefaults.headers. A test asserts a header value cannot appear in the response.HOST_CONFIG_INPUT_V2_WIRE_KEYSlives besideHARNESS_IDSin the SDK, with a compile-time guard that fails the build whenHostConfigInputV2gains a field that is neither on the wire list nor named as a known gap. Verified by adding a probe field: the build fails and the error names the offending key.Because the write no longer reaches Convex, the Sentry error stops too — the inspector's own capture is gated on
status >= 500, so the 400 is not reported.Tradeoff worth reviewing
This adds a deploy-order coupling the old forward-everything behavior did not have: a field the backend validator gains is refused here until the SDK list learns it. The two have to move together. It is documented on the assertion.
oauthProfileis a live gapThe SDK type declares it and the canonicalizer handles it, but
grep -rn oauthProfile convex/in mcpjam-backend returns nothing — no validator, no column. Any caller sending it fails today; now it fails with a clear 400. Named explicitly in the guard so closing the gap means moving the key into the wire list.Not in scope
useClients.ts), bypassing this route, so an invalid config there still gets the opaque error. Low risk — it always seeds from templates.hostConfigInputV2Validator's keys are exactlyHOST_CONFIG_INPUT_V2_WIRE_KEYS, the way the repo already does forHARNESS_IDS.Verification
server/routes/v1/__tests__/clients.test.ts+client-write-freeze.test.ts: 91 passedsdkhost-config parity / canonicalize / seed-template: 167 passednpm run typecheck -w @mcpjam/sdk: exit 0tsc -p server/tsconfig.json: 226 errors, identical to the pre-existing baseline measured with the branch stashed; zero in the touched filesOne existing test asserted the old behavior ("leaves an unrecognized key alone"). Its point was that unknown keys must never be silently dropped, which still holds — it now asserts they are refused rather than forwarded.
Summary by cubic
Returns a 400 naming the offending config field instead of forwarding unknown keys to Convex, where production redacts the validation error to a generic "Server Error" (fixes CONVEX-1ZM).
/hostsalias) validate config keys againstHOST_CONFIG_INPUT_V2_WIRE_KEYSfrom the SDK before writing.initialize→mcpProfile.initialize), and never echoes config values.HostConfigInputV2and the suggestion map againstHostConfigMcpProfileV1, so a stale or invented entry fails the build (mrtrModeswas dropped for exactly that).oauthProfileis rejected because no backend validator or column accepts it; the guard treats it as a declared gap, so closing the gap means moving one key.Written for commit 8fbd951. Summary will update on new commits.