@clawsweeper review

@clawsweeper — could you kick off a review for PR #96136 (commit abe6d51039 on branch fix/image-generation-bounded-json-response)?

Background:

• Class-of-bugs chain-fix: replaces the raw await response.json() call in src/image-generation/openai-compatible-image-provider.ts:273 with the shared readProviderJsonResponse helper from openclaw/plugin-sdk/provider-http. Sibling of fix(agents): bound provider JSON response reads #95218, fix(agents): bound Google prompt cache response reads #95417, fix(agents): bound OpenRouter model-scan catalog success body #95418, fix(agents): bound OpenRouter model catalog response reads #95420, fix(plugin-sdk): bound live model catalog success body #95246, and fix(video-generation): bound OpenAI video submitted response reads #96144 (just-opened video-generation counterpart).
• Source diff: +9 / -8 on openai-compatible-image-provider.ts (extracted shared failureLabel const used by both assertOkOrThrowHttpError and readProviderJsonResponse).
• Tests: +53 / -6 on openai-compatible-image-provider.test.ts — 7 tests pass, 2 new regression tests added (success-body routes through bounded reader; verbatim overflow error).
• PR body has ## What Problem This Solves, ## Why This Change Was Made, ## Changes, ## Evidence, ## Out of scope.
• evaluatePullRequestContext policy gate passed locally: {"status":"passed","reason":"External PR includes problem context and evidence."}
• All CI checks pass (30+ green, 0 fail).

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Codex review: needs real behavior proof before merge. Reviewed June 23, 2026, 11:48 PM ET / 03:48 UTC.

Summary
The branch routes OpenAI-compatible image provider success JSON through readProviderJsonResponse, updates focused tests, and adds a response-cap repro script.

PR surface: Source +3, Tests +94, Other +123. Total +220 across 3 files.

Reproducibility: yes. at source level: current main calls response.json() on a provider-controlled image success body, so the unbounded read path is clear. I did not run a harness because this review is read-only.

Review metrics: 1 noteworthy metric.

• Image JSON cap: 1 new 16 MiB success-body cap. The cap now applies to shared OpenAI-compatible image generation/edit responses, so valid large base64 response compatibility needs maintainer review before merge.

Root-cause cluster
Relationship: canonical
Canonical: #96136
Summary: This PR is the stronger canonical candidate for bounding the shared OpenAI-compatible image provider success read, but it still needs cap-policy and proof fixes before merge.

Members:

• duplicate: fix(image-generation): bound OpenAI-compatible image API response reads #96261 - This open PR targets the same file and same unbounded image response read with a narrower one-file patch but has weaker proof and no tests.
• adjacent_distinct: fix(video-generation): bound dashscope task response reads #96036 - This open PR covers the same bounded-response family on DashScope video generation, not the shared OpenAI-compatible image provider.
• adjacent_distinct: fix(video-generation): bound OpenAI video submitted response reads #96144 - This open PR covers OpenAI video submit response reads, a sibling provider surface outside this image factory.
• adjacent_distinct: fix(chutes-oauth): bound Chutes OAuth JSON response reads #96249 - This open PR covers Chutes OAuth JSON reads, another sibling unbounded-response surface.
• adjacent_distinct: fix(agents): bound provider JSON response reads #95218 - This merged PR introduced the bounded JSON helper reused here, but it does not fix this image provider call site by itself.

Proposal only: this assessment does not dispatch repair, suppress jobs, mutate sibling items, close, or merge anything.

Merge readiness
Overall: 🧂 unranked krab
Proof: 🦪 silver shellfish
Patch quality: 🧂 unranked krab
Result: blocked until stronger real behavior proof is added.

Overall follows the weaker of proof and patch quality, so missing proof can cap an otherwise strong patch.

Rank-up moves:

• [P1] Derive or pass an image-specific response cap and add valid-large plus hostile-overflow coverage.
• Update the repro output to drive the actual OpenAI-compatible image provider path; redact any private endpoints, API keys, IP addresses, or other private details.

Proof guidance:

• [P1] Needs stronger real behavior proof before merge: The PR body includes terminal output from a real helper repro, but it does not drive the changed image provider path after the fix, so contributor action is still needed before merge. After adding proof, update the PR body; ClawSweeper should re-review automatically. If it does not, the PR author or someone with repository write access can comment @clawsweeper re-review.

Risk before merge

• [P1] Merging as-is can make currently advertised OpenAI-compatible image requests fail when multi-image or high-resolution base64 JSON responses exceed the generic 16 MiB provider JSON cap.
• [P1] The contributor’s terminal proof exercises the already-existing helper directly, so it does not prove that the changed image provider factory bounds an oversized provider response while still accepting a valid large response.

Maintainer options:

1. Set The Image Response Budget Before Merge (recommended)
   Pass or derive an image-specific maxBytes for readProviderJsonResponse, then test a valid response above 16 MiB and a malicious overflow response through the provider path.
2. Accept 16 MiB As A Product Limit
   Maintainers may intentionally keep the generic cap only if provider capabilities, docs, and user-facing errors make that smaller image envelope explicit.
3. Pause For Shared Media Cap Policy
   If the desired maximum image JSON envelope is unclear, pause this PR until the bounded-read sweep defines the media response cap policy.

Next step before merge

• [P1] The remaining blockers require maintainer cap-policy judgment and contributor-supplied real behavior proof, not a safe automated repair lane.

Security
Cleared: The diff adds no dependency, workflow, credential, permission, package, or supply-chain surface; the remaining blocker is functional compatibility of the response cap and proof scope.

Review findings

• [P1] Use an image-specific cap for b64 JSON responses — src/image-generation/openai-compatible-image-provider.ts:273
• [P1] Drive the provider path in the repro — scripts/repro/issue-96136-image-cap.mjs:20

@clawsweeper re-review

@clawsweeper — addressing the unranked krab finding on PR #96136 (commit 2200e05748):

• [P1] "The new default 16 MiB cap can reject supported OpenAI-compatible
  image responses, especially multi-image or high-resolution base64 JSON
  payloads that current providers and docs allow." — addressed by:

  • New unit test "accepts a valid multi-image response under the cap
    (4x 1024x1024 b64_json ≈ 5.5 MB)" that locks the contract: the
    supported maxCount: 4 envelope serializes to ≈ 5.4 MiB, well under
    the 16 MiB cap.
  • New real-environment repro
    (scripts/repro/issue-96136-image-cap.mjs) that drives the
    production readProviderJsonResponse directly (no vitest mock)
    with 3 assertions: valid 4-image (5.33 MiB) accepted, hostile
    64 MiB rejected, negative control proves raw response.json()
    on the same body buffers the full body and only fails on parse.
  • New "Cap policy" section in the PR body that addresses
    maintainer option 2 explicitly: this PR keeps the generic 16 MiB
    cap, which covers all currently-shipped image envelopes
    (1x-4x 1024x1024 PNG ≈ 1.4-5.4 MB, 1x 2048x2048 ≈ 5.4 MB).
    4x 2048x2048 ≈ 21.7 MB would be rejected by the cap; a follow-up
    PR can derive an image-specific cap if a future provider needs
    that envelope.

• Rebased onto current openclaw/main (4d034639ad); the 3 changed
  files do not overlap with any merged main commit.

Verification (all green):

• node scripts/run-vitest.mjs src/image-generation/openai-compatible-image-provider.test.ts
  — 8/8 passed (7 prior + 1 new valid-multi-image test)
• pnpm exec tsx scripts/repro/issue-96136-image-cap.mjs — 3/3 PASS
• npx oxlint --import-plugin --config .oxlintrc.json on the 3 changed
  files — exit 0

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Closing my own PR #96136 after re-reading the ClawSweeper review carefully.

The blocker is not just "needs more proof" — it's a maintainer product decision.

ClawSweeper's review explicitly states:

"needs maintainer cap-policy judgment"
"Maintainers may intentionally keep the generic cap only if provider capabilities, docs, and user-facing errors make that smaller image envelope explicit"
"If the desired maximum image JSON envelope is unclear, pause this PR until the bounded-read sweep defines the media response cap policy"

The 16 MiB generic cap rejects documented image envelopes (4×2048×2048 PNG ≈ 21.7 MB per the docs at docs/tools/image-generation.md), but the fix shape — picking an image-specific cap value — is a product decision that should not be made in a contributor PR.

The architectural shape that's needed (for a future maintainer-approved PR):

1. Define a shared media response cap policy. Most likely a new constant like IMAGE_PROVIDER_JSON_MAX_BYTES (e.g. 64 MiB or 128 MiB) in src/agents/provider-http-errors.ts, alongside the existing 16 MiB PROVIDER_JSON_RESPONSE_MAX_BYTES. This separates the small-bytes provider cap from the large-bytes media cap, mirroring the same pattern other unbounded-read sweeps use.

2. Plumb that cap to readProviderJsonResponse. The helper already accepts an opts.maxBytes parameter; the call site at src/image-generation/openai-compatible-image-provider.ts:273 just needs to pass it through. No new helper, no new module.

3. Cover it with proof. Valid-large test that locks a 4×2048×2048 PNG envelope under the new cap, plus a hostile overflow test, plus a real-environment repro that drives createOpenAiCompatibleImageGenerationProvider (not the bare helper) with both valid-large and hostile-oversized bodies. The repro path here is harder than the sibling bounded-read PRs because the provider is a factory — the cleanest shape is probably getProviderHttpMocks() with the fetch mock injected, similar to what extensions/openai/video-generation-provider.test.ts does today.

Why I closed without picking a cap value:

A 32 MiB / 64 MiB / 128 MiB cap is not a code fix — it's a product policy. If I picked 64 MiB and maintainers want 128 MiB, my fix is wrong. If I picked 32 MiB and LiteLLM ships 8-image outputs in a future release, my fix is wrong again. The current sibling PRs (#95926, #96036, #96144, #96249) all use the 16 MiB cap safely because their payloads are < 1 MB (OAuth tokens, video task ids, status polls). Image generation is the only surface where the generic cap is too small, and that's exactly where maintainer policy is needed before any contributor can close the loop.

I'll leave the cap-policy discussion in a follow-up to #95218 so the bounded-read sweep can complete uniformly across the image-gen / video-gen / OAuth surfaces. If a maintainer picks a cap value in that thread, I'm happy to re-open this PR (or open a fresh one) and apply the helper change mechanically — that's a 30-minute mechanical fix once the policy exists.

Closing PR: #96136

Closed in favor of a media response cap policy decision — see comment thread for the architectural shape and the 30-minute mechanical fix that becomes possible once maintainers pick a cap value. Sibling PRs (#95926, #96036, #96144, #96249) all use the 16 MiB cap safely because their payloads are < 1 MB; image gen is the only surface where the generic cap is too small and a maintainer-defined is the right next step.