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[PR #3995] [CLOSED] fix(mcp): advertise a screenshot example with a valid PNG checksum #5984
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opened 2026-10-31 01:10:56 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/3995
Author: @jackie-cqz
Created: 10/15/2026
Status: ❌ Closed
Base:
main← Head:fix/3938-advertised-screenshot-png-checksum📝 Commits (1)
066a48afix(mcp): advertise a screenshot example with a valid PNG checksum📊 Changes
2 files changed (+62 additions, -2 deletions)
View changed files
📝
src/contracts/browserToolContracts.ts(+5 -2)➕
tests/conformance/contracts/advertisedScreenshotExamples.test.ts(+57 -0)📄 Description
Summary
Fixes #3938.
Prepared with AI assistance. A human owner reviews the final diff and owns this
PR, per the Author readiness declarations below.
The advertised
compare_web_screenshotsexample embedded a one-pixel PNG whoseIDAT chunk checksum was stale. The artifact schema validated the bytes, so the
example passed input-schema checks and shipped in the default full catalog, but
the comparison parser rejects an invalid chunk checksum. A caller following the
advertised example therefore received an
invalid_input/invalid_formatfailure instead of comparison Evidence.
Problem and expected behavior
Smallest trigger: submit the advertised
compare_web_screenshotsexample toeither production entry point.
rea compare-web-screenshots "<advertised artifact>" "<same>" --jsonexited 1 with
details.issues[0].message: "Invalid PNG chunk checksum".tools/callwith the example read from the same server'stools/list.Byte inspection of the advertised artifact: the IHDR and IEND checksums match,
the IDAT chunk stores
3f35af59, and CRC-32 of its type and data is3dc848ef.Violated invariant:
docs/mcp-contracts.mdstates "Every advertised example isa distinct valid canonical input." The example was schema-valid but not a valid
canonical input for its own tool.
Expected: the advertised example compares successfully, reporting
status: identical,compared_pixels: 1,changed_pixels: 0. Deliberatelymalformed PNGs must still be rejected.
Change and scope
sha256inexampleScreenshot().tests/conformance/contracts/advertisedScreenshotExamples.test.ts, whichadmits every advertised PNG artifact through the same comparison parser a
caller reaches, so a stale hand-written encoding cannot return unnoticed.
Why this fits REA's architecture: the schema validates artifact identity
(base64, byte count, digest) but only the parser owns PNG structure, so no
schema-level test could catch this. The new test asserts at the parser boundary
and deliberately fails if it examines no artifacts, so it cannot pass vacuously.
The artifact stays a literal in the contract rather than being generated at
import, because contracts are a pure layer and must not pull
node:zlibin.Intentionally not included: no change to PNG validation strictness, no change to
the artifact schema, and no authored change to generated catalogs (they are
ignored build outputs).
Contract and boundary impact
advertised example value; request parsing/validation stage.
ordinary fix inside existing boundaries.
compare_web_screenshotsinputSchema.examples[0]value changes. No schema, field, or tool changes.or platform behavior changes.
corrected artifact remains a 70-byte, 1x1,
image/pngartifact whose digestmatches its bytes.
applicable): not applicable; no process, target, or browser is involved.
.cache/mcp-tool-catalog.jsonregenerates with the new value; it is an ignored, test-only output.
Expected effects (check known effects; use documentation-only on its own).
Unchecked items do not establish absence; leave uncertainties visible.
Evidence and regression coverage
tests/conformance/contracts/advertisedScreenshotExamples.test.ts(new, 2 tests).with
TypeError: Invalid PNG chunk checksumatsrc/browser/PngVisualDiff.ts:129,the same rejection the CLI and MCP reported. With the corrected bytes it passes.
examined at least the comparison example so it cannot pass vacuously, but PNG
structure is still validated only by the parser, not by the artifact schema.
For evidence-bearing changes:
Validation performed
npm run test:local -- tests/conformance/contracts/advertisedScreenshotExamples.test.ts src/contracts/advertisedInputExamples.test.ts src/browser/PngVisualDiff.test.ts— 3 files, 24 tests passed.Invalid PNG chunk checksumatsrc/browser/PngVisualDiff.ts:129; passes after the fix.npm run check:fast— typecheck and lint (includingverify:module-boundaries) succeeded, 2/2 tasks.npm run test:focused -- tests/boundary/mcp/toolSchemaValidity.test.ts tests/boundary/mcp/contractPresentation.test.ts— 2 files, 15 tests passed with the regenerated catalog.HOME=$(mktemp -d) node scripts/rea.mjs compare-web-screenshots "<example>" "<example>" --json— exit 1,reason: invalid_format,message: "Invalid PNG chunk checksum".normalized_result.status: identical,compared_pixels: 1,changed_pixels: 0.tools/listfromnode scripts/rea.mjs mcp, thentools/callwith the advertised example unchanged —isErrorunset,status: identical,compared_pixels: 1,changed_pixels: 0.npm run check:pr(the complete local gate), and no real browser was involved.Compatibility, safety, and release
corrected; no caller-visible contract, schema, or behavior is removed.
behavior is exercised by this change; the comparison parser is exercised
directly and through both production adapters.
constant example value and a test.
Author readiness
Human owner:
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.