fix(model-gateway,server): strict-gateway embedding compat and on-demand chat readiness - #3218
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Certain OpenAI-compatible gateways (LiteLLM routes over TEI-style backends) answer HTTP 400 to optional extras a plain curl never sends — the unconditional encoding_format and, on some backends, the array input shape. The customer's indexing preflight died on exactly this answered 400 while chat and a minimal manual curl succeeded. On an answered 400/422 the scalar transport now retries ONCE in the minimal wire shape (no encoding_format; float is the OpenAI default). The batch transport first retries the array minimally, then degrades to per-item scalar requests, each carrying its own minimal retry. Auth/404/429/5xx keep their existing semantics; a still-rejected minimal request surfaces the original status through the 0.3.9 error taxonomy. Red-proven: all compat pins fail with the rejection detector disabled. Refs #3214 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe PR adds strict-gateway compatibility retries for embeddings and on-demand conversation readiness probes for chat creation, sending, and streaming. It also adds unit and integration coverage for fallback request shapes, readiness behavior, and end-to-end indexing. ChangesStrict-gateway embedding compatibility
On-demand conversation readiness
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to This change adds embedding retries and scalar fallback for strict gateways while probing chat readiness on demand. In its current form, indexing can make long sequential request chains, readiness checks can reuse stale results or repeat after failures, and provider errors can be reported inaccurately. These issues can delay or repeatedly fail indexing and chat requests, so the PR is not safe to merge until the fallback bounds and readiness/error handling are corrected. Possibly related PRs
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oscharko
enabled auto-merge (squash)
August 19, 2026 04:15
A fresh install carries a configured gateway but NO readiness observation, so every chat create/send was rejected as "not ready" until the user manually probed each model in settings (customer field incident). The create, buffered send, and stream entries now run the minimal chat probe on demand when a model has no current-generation observation — the admission stays honest (the probe must pass, an observed not-ready is respected without re-probing, concurrent callers share one in-flight probe). The field-twin test drives the full fresh-install customer journey over the REAL production deps against a strict fake LiteLLM (chat fine, embeddings 400 on any request carrying optional extras): save credentials, open a chat immediately, create a pod, connect an HTML+MD folder, index to vectors. Single-point sabotages reproduce both customer symptoms byte-exact: disabling the compat ladder fails indexing (409 instead of 200), disabling the on-demand probe fails the first chat (400 instead of 201). The former "rejects an unready configured model before provider fetch" pin is relocated and strengthened: outbound probe calls are permitted, but NO fetch body may ever carry the user's content, and the failed probe must be recorded. Refs #3214 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
oscharko
changed the title
… branches Sonar new-code coverage: the non-strict minimal-retry failure keeps the original strict status, the scalar-fallback batch aborts on its first failing item, and the on-demand readiness guards (no gateway, empty id, already ready, observed not-ready at the current generation) return without probing. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Inline comments:
In `@packages/keiko-model-gateway/src/openai-embedding-adapter.compat.test.ts`:
- Around line 45-73: Extend coverage around requestOpenAIEmbeddingBatch with a
scalar-fallback test where the second of three inputs returns 401, asserting
wrong-header, status 401, and no request for the third input. Add a
minimal-array retry test where the first attempt returns 400 and the retry
returns 500, asserting http-error, status 500, and exactly two requests. Update
the batch non-strict-status handling so the retry failure’s status is returned
instead of the initial validation rejection status.
In `@packages/keiko-model-gateway/src/openai-embedding-adapter.ts`:
- Around line 494-512: Update requestMinimalShapeEmbeddingBatch and the
strict-gateway fallback flow to cache negotiated embedding shape per endpoint
and model using a module-level Map with full, minimal-array, and scalar-only
states. On cache hits, begin at the known-good rung instead of rediscovering
rejected shapes; retain the existing ladder for cache misses, update the cache
after successful negotiations, and leave compliant-gateway single-request
behavior unchanged.
- Around line 229-237: Align the minimalShape behavior and comments in both
single-request and batch embedding ladders: either omit dimensions alongside
encoding_format and verify indexing tolerates the resulting vector width, or
narrow the “minimal” wording to describe only encoding_format while preserving
dimensions. Update the corresponding request-body construction and the matching
batch comment consistently.
- Around line 336-340: Update the failure handling in both
requestMinimalShapeEmbedding and requestMinimalShapeEmbeddingBatch so kind and
status are derived from the same response. Use the retry response’s status for
both fields when it fails, while retaining originalStatus only when the retry
repeats a validation-shaped rejection; preserve body disposal and existing
success behavior.
- Around line 514-539: The requestScalarFallbackBatch function currently allows
each sequential scalar attempt to use its own timeout, so the full fallback can
exceed the intended batch duration. Introduce one absolute batch deadline for
the complete loop, derive each request’s remaining timeout from it, and
stop/propagate the timeout outcome when the deadline is reached; preserve the
existing request options and add a regression test proving the fallback halts at
the batch deadline.
In `@packages/keiko-server/src/chat-handlers.test.ts`:
- Line 184: Update the test “keeps user content off the provider while probing
an unready model on demand” to assert that fetchSpy recorded the expected
bounded on-demand probe count before inspecting request bodies. Preserve the
existing user-content checks and derive expectations from the fixture rather
than duplicating the production probe payload.
In `@packages/keiko-server/src/gateway-readiness.ts`:
- Around line 1301-1303: Update the readiness probe promise in
runGatewayReadiness so its catch handler records a redacted server-side
diagnostic, including a correlation ID, before resolving to undefined; preserve
the existing user-facing suppression and unready-model result.
- Around line 1296-1308: Update the on-demand probe coordination around
onDemandReadinessProbes and gatewayConfig generation so pending probes are
scoped to both the gateway holder and its generation, preventing callers for a
newer generation from awaiting an obsolete probe. Alternatively, after awaiting
an entry from another generation, re-check readiness and run a new-generation
probe before returning; preserve deduplication for callers sharing the same
generation.
- Around line 1301-1308: Update the failed-probe handling around
runGatewayReadiness and recordReadinessObservation to persist conversationReady:
false for the current generation after stale capability fields are cleared, so
subsequent rejected chat attempts reuse the observed not-ready state instead of
starting another probe. Add a retry test verifying the second rejected request
does not create an additional probe.
In `@packages/keiko-server/src/strict-gateway-field.test.ts`:
- Around line 85-93: Update listen to accept the promise’s reject callback and
use it instead of throwing when server.address() is invalid; also register the
server’s error event to reject the promise on bind failures, ensuring every
failure path settles the promise.
- Around line 44-49: Update the request-body handling in the createServer
callback to collect incoming Buffer chunks without decoding them individually,
then concatenate and decode the complete body once in the end handler before
JSON.parse. Preserve the existing request parsing and test behavior.
- Around line 230-237: Update the assertions in the strict gateway test to
explicitly verify that an array-input embedding request was attempted, alongside
the existing encoding_format and minimal scalar checks. If the indexing path
does not issue array requests, remove the array-rejection claim from the nearby
comment instead and preserve assertions for the actual request sequence.
- Around line 218-228: Update the response assertions around
buildCapsuleResponseBody to use body.indexingJobs directly, removing the jobs
alias and fallback. Assert the newest job with body.indexingJobs.at(0)?.status
equal to succeeded, preserving the existing capsule and health assertions.
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packages/keiko-server/src/strict-gateway-field.test.tspackages/keiko-server/src/chat-handlers.test.tspackages/keiko-server/src/chat-stream-handlers.tspackages/keiko-server/src/gateway-readiness.tspackages/keiko-model-gateway/src/openai-embedding-adapter.tspackages/keiko-model-gateway/src/openai-embedding-adapter.compat.test.tspackages/keiko-server/src/chat-handlers.ts
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🧠 Learnings (5)
📚 Learning: 2026-07-24T19:25:13.892Z
Learnt from: oscharko
Repo: oscharko-dev/Keiko PR: 2697
File: packages/keiko-server/src/editor/inlineCompletionRoutes.ts:616-616
Timestamp: 2026-07-24T19:25:13.892Z
Learning: In `packages/keiko-server`, follow ADR-0141 D5’s AppSession/request-authorization model for workspace root resolution. When reviewing code that performs the `resolveRequestRoot`-style authorization gate, ensure it (1) re-proves persisted workspace identity, (2) derives the request root path, (3) enforces canonical realpath containment within the expected workspace/root to prevent path traversal, (4) verifies workspace presence/validity, and (5) requires a live AppSession (launcher-attested, process-scoped authority per BFF). Do not require a task identity for this gate if AppSession does not model task identity; authorization should be uniform and based on the same-user local threat model rather than per-task/per-workspace session semantics.
Applied to files:
packages/keiko-server/src/strict-gateway-field.test.tspackages/keiko-server/src/chat-handlers.test.tspackages/keiko-server/src/chat-stream-handlers.tspackages/keiko-server/src/gateway-readiness.tspackages/keiko-server/src/chat-handlers.ts
📚 Learning: 2026-07-25T18:42:13.123Z
Learnt from: oscharko
Repo: oscharko-dev/Keiko PR: 2716
File: packages/keiko-tools/src/editor-agent-client.test.ts:692-692
Timestamp: 2026-07-25T18:42:13.123Z
Learning: In Keiko TypeScript test files, do not request explicit return type annotations for callbacks passed to typed Vitest `it(...)` and `it.each(...)`. Specifically, avoid adding `: void` or `: Promise<void>` to those callback functions when the ESLint rule `typescript-eslint/explicit-function-return-type` is configured with `allowTypedFunctionExpressions: true` (i.e., typed function expressions are intentionally exempt). Only ask for explicit return types if the ESLint configuration changes; otherwise preserve the existing surrounding test-file style.
Applied to files:
packages/keiko-server/src/strict-gateway-field.test.tspackages/keiko-server/src/chat-handlers.test.tspackages/keiko-model-gateway/src/openai-embedding-adapter.compat.test.ts
📚 Learning: 2026-07-26T21:23:56.288Z
Learnt from: oscharko
Repo: oscharko-dev/Keiko PR: 2755
File: packages/keiko-server/src/grounded-qa-hybrid.ts:1006-1012
Timestamp: 2026-07-26T21:23:56.288Z
Learning: In Keiko’s internal “stable-ID” hash helper functions (e.g., where stable identifiers are computed for persistence/comparison), preserve the existing UTF-16 code-unit iteration semantics when modernizing. Specifically, if the current implementation iterates with `charCodeAt(i)` (code units) rather than `codePointAt(i)` (Unicode code points), keep `charCodeAt(i)` to avoid changing the resulting stable IDs. If changing from `charCodeAt` to `codePointAt` is ever desired, it must be an explicitly planned compatibility/migration decision (e.g., versioning, backfill, or dual-read/write) rather than a mechanical refactor.
Applied to files:
packages/keiko-server/src/strict-gateway-field.test.tspackages/keiko-server/src/chat-handlers.test.tspackages/keiko-server/src/chat-stream-handlers.tspackages/keiko-server/src/gateway-readiness.tspackages/keiko-server/src/chat-handlers.ts
📚 Learning: 2026-07-27T10:55:30.485Z
Learnt from: oscharko
Repo: oscharko-dev/Keiko PR: 2766
File: packages/keiko-server/src/qualityIntelligence/figmaSnapshotRoutes.test.ts:1738-1738
Timestamp: 2026-07-27T10:55:30.485Z
Learning: When reviewing TypeScript files, do not flag single-quoted string literals as a violation if they match Prettier’s formatter-approved output. Specifically, if Prettier is configured to prefer double quotes but retains a single-quoted literal solely because switching to double quotes would require escaping embedded double quotes, allow the single quotes (i.e., don’t “fix” it beyond what Prettier would produce).
Applied to files:
packages/keiko-server/src/strict-gateway-field.test.tspackages/keiko-server/src/chat-handlers.test.tspackages/keiko-server/src/chat-stream-handlers.tspackages/keiko-server/src/gateway-readiness.tspackages/keiko-model-gateway/src/openai-embedding-adapter.tspackages/keiko-model-gateway/src/openai-embedding-adapter.compat.test.tspackages/keiko-server/src/chat-handlers.ts
📚 Learning: 2026-07-27T18:08:22.461Z
Learnt from: oscharko
Repo: oscharko-dev/Keiko PR: 2780
File: packages/keiko-server/src/store/migrations.test.ts:78-95
Timestamp: 2026-07-27T18:08:22.461Z
Learning: When reviewing TypeScript lint findings (e.g., from typescript-eslint/no-unsafe-assignment), ensure the issue is reproducible using the repository’s configured ESLint setup/TS project settings. Do not treat diagnostics observed under a mismatched TypeScript project/tsconfig as authoritative; only accept them as real if you can reproduce them with the same ESLint configuration the repo uses (e.g., via its full/targeted lint scripts). In related test code, prefer deriving branded identity types from the production function return types to keep RootIdentity/brand fields type-compatible and avoid unsafe assignments.
Applied to files:
packages/keiko-server/src/strict-gateway-field.test.tspackages/keiko-server/src/chat-handlers.test.tspackages/keiko-server/src/chat-stream-handlers.tspackages/keiko-server/src/gateway-readiness.tspackages/keiko-model-gateway/src/openai-embedding-adapter.tspackages/keiko-model-gateway/src/openai-embedding-adapter.compat.test.tspackages/keiko-server/src/chat-handlers.ts
🔇 Additional comments (8)
packages/keiko-server/src/gateway-readiness.ts (1)
25-25: LGTM!packages/keiko-server/src/chat-handlers.ts (1)
67-67: LGTM!Also applies to: 241-245, 2019-2021, 2266-2269
packages/keiko-server/src/chat-stream-handlers.ts (1)
23-23: LGTM!Also applies to: 650-655
packages/keiko-model-gateway/src/openai-embedding-adapter.ts (1)
345-361: LGTM!Also applies to: 469-489
packages/keiko-model-gateway/src/openai-embedding-adapter.compat.test.ts (3)
10-22: LGTM!
25-43: LGTM!Also applies to: 75-100
102-136: LGTM!packages/keiko-server/src/strict-gateway-field.test.ts (1)
103-139: LGTM!
…be per review - kind and status of a failed minimal retry now come from the SAME response; a synthetic retry-kind/original-status pair surfaced contradictory operator diagnostics. - The ladder remembers strict endpoints (encoding_format and array rejection) so indexing stops re-discovering strictness per call — the doomed extras round trip is skipped once learned, cutting the strict-gateway request amplification. - One absolute deadline (the batch timeoutMs) bounds the COMPLETE ladder including the scalar fallback; per-item requests get the remaining budget and the fallback stops with a timeout instead of walking 96 inputs for up to 30s each. - On-demand readiness: the in-flight key carries the config generation, a rejected probe run lands as a redacted operator diagnostic instead of a silent swallow, and a failed probe persists an explicit current-generation not-ready observation so retries hit the guard instead of the provider. - Field twin: byte-safe body decoding, promise-safe listen, indexingJobs.at(0), and an explicit assertion that the array rung was attempted and rejected. - Relocated probe pin now requires bounded probe evidence (1-4 calls) plus the strengthened user-content exclusion; dimensions deliberately stays in the minimal shape (capsule-pinned vector-space identity) with the comment fixed. Refs #3214 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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oscharko
dismissed
coderabbitai[bot]’s stale review
August 19, 2026 11:06
Dismissing per owner's standing instruction for stalled CodeRabbit reviews: all 13 findings of this review are fixed in 76e4dfd (three correctness repairs: same-response kind/status pair, generation-scoped in-flight probe, persisted not-ready observation; plus memo, deadline, diagnostics, and test hardenings), every thread carries its fix reference and is resolved, and Sonar passes with 86.5% new-code coverage.
Contributor
Author
|
Release directive (owner, 2026-08-19 working session): ship both repairs immediately as v0.3.11 — the customer's LiteLLM deployment needs indexing and first-run chat working. Approved-for-publish: @oscharko-dev/keiko@0.3.11 |
oscharko
added a commit
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Aug 19, 2026
Bump every workspace package, the exported KEIKO_*_VERSION constants, and the lockfile to 0.3.11; add the release-impact catalog entry for the strict-gateway embedding compat ladder and the on-demand conversation readiness (#3218). Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This was referenced Aug 19, 2026
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Summary
Fixes the customer's Knowledge Pod indexing failure that survived 0.3.10 — finally diagnosable after the process restart let the 0.3.9 error taxonomy surface the real cause: their LiteLLM answers Keiko's embedding requests with HTTP 400 while chat and a minimal manual curl succeed.
The difference is the wire shape: Keiko unconditionally sends
encoding_format: "float"and uses arrayinputfor batches/probes; strict OpenAI-compatible backends (certain LiteLLM routes over TEI-style engines) reject both with a validation 400.Fix — a bounded compat ladder in the embedding transport (owning layer):
encoding_format; float is the OpenAI default anyway).Both the verification probe and chunk embedding run over these transports, so preflight and indexing inherit the ladder.
Reuse / No-Duplication
The ladder lives inside the two existing transport functions; no new adapter or parallel path.
Verification
openai-embedding-adapter.compat.test.ts: scalar retry dropsencoding_format(asserted on the second request body); array-rejecting gateway degrades to scalars with correct per-item vectors and exact call count; encoding_format-only rejection keeps the batch shape; hard 400 still fails withhttp-error+ status after exactly one retry; 401 never compat-retries.format:check,gates:sonargreen locally.Update-Impact
Behavioral fix in the embedding transport only. Ships as patch release 0.3.11.
Refs #3214
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