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[GH-ISSUE #7603] [Bug] Divergent unknown-history import recommends re-importing an unchanged valid bundle #4531
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opened 2026-10-31 00:50:32 +00:00 by bsakaguchi
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Delete branch "%!s()"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Originally created by @coygeek on GitHub (Oct 27, 2026).
Original GitHub issue: https://github.com/morluto/rea/issues/7603
Before submitting
Area
MCP or agent integration
Observed behavior
After importing one exported investigation branch, this MCP request refuses a second, independently valid branch whose revision 2 of the same residual unknown has a different status:
The refusal reports
evidence_integrity_mismatch, says the Evidence is invalid or changed, and recommends recreating or re-importing it. Repeating the same import gives the same refusal. Its only detail isreason: "Conflicting unknown revision"; it does not identify which unknown or revision conflicts. Both exported branches import successfully in fresh sessions, pass standalone CLI validation, and re-export byte-for-byte. The retained session bundle remains unchanged after each refusal.Atomic rejection of divergent immutable histories is expected. The defect is the canonical message and recovery instruction treating this retained/incoming history collision as something re-importing the valid bundle can repair.
Reproduction
dist/build and Node.js 24.22.1 on PATH. Python 3 is used only to build fixtures and launch the commands. No analysis engine is needed.REA_VERIFY_SCRATCHoptionally selects the parent of its disposable directory.unchanged: true. The controls then print:The original replay and two executions of the reduced reproduction each produced the same four refusals: twelve matching attempts across both import orders. These executions include repeats of each unchanged import rather than independent random fixtures.
Expected behavior
Keep rejecting divergent unknown histories atomically, while reporting that the incoming history conflicts with history retained by this session. Recovery should explain that re-importing unchanged content into the unchanged session cannot resolve it. It should direct callers to inspect or select the relevant histories, or explicitly state that combining them requires reconciliation outside the available import operation. An unknown ID and revision would make the refusal easier to act on, but no particular new code or details layout is required by this report.
The repository's Architecture and Cleanup invariant requires meaningful failure reasons and preserved identity across boundaries. The import contract promises authenticated, atomic merging, and the existing ledger regression expressly requires rejection of divergent heads. The proposed correction preserves that rejection; it does not request automatic conflict resolution. Source locators are in Evidence below.
Impact and scope
P2: the canonical remediation gives ineffective recovery advice for a bounded investigation-handoff conflict. The observed retry never succeeds, and the error omits the identity needed to locate the conflicting history. Both branches remain valid and usable independently in fresh sessions, which is a demonstrated way to inspect either history. A supported lossless way to combine both conflicting histories was not established.
The complete session bundle stayed unchanged after every refused import. No corruption, data loss, automatic retry loop, discarded investigation, or production occurrence rate was observed. Only the two-revision, one-unknown fixture and the stated runtime were tested. Longer histories, inter-unknown relationships, and repairing a conflict through later updates were not executed.
REA version
Exact
node scripts/rea.mjs --versionoutput:Source baseline:
65f1c447344a423fa2785847dbcea1e9a9e2454a.Runtime and platform
Node.js v24.22.1; macOS 27.0.1; arm64. Used the prepared source-checkout build; no runtime rebuild or dependency installation was performed during verification.
Target and artifact context
A synthetic ZIP with two short text entries supplies authentic supporting Evidence through
inspect-artifact. Two separate MCP sessions record the same question and update revision 2 toinvestigatingversusblocked, then export their own canonical bundles. No binary is opened, no target code executes, and no Hopper, Ghidra or GUI application is required.Interface
MCP
Earliest failure stage
Artifact or evidence registration
Relevant output or evidence
The second import in each order returns
isError: trueand the following decoded MCP text content. Repeating the identical request returns the same fields:There is no
recoveryfield. The first import succeeds withimported: 4,unknowns_added: 2,total: 4. Standalone CLI imports return those same counts with exit 0. Both CLI exports succeed, and direct byte comparison confirms each exported branch is already canonical. The reproduction asserts equality of the complete retained bundle before and after each rejected merge.Source at the baseline:
AGENTS.md, Architecture and Cleanup: preserve identity and meaningful failure reasons across boundaries.src/contracts/sessionToolContracts.ts:92-95: supported authenticated atomic import operation.src/application/investigation/EvidenceLedger.residualUnknown.test.ts:391-443: divergent heads must be rejected atomically.src/application/investigation/EvidenceLedger.ts:140-149: finds an existing equal unknown-ID/revision key with a different revision digest and returns the conflict reason before committing.src/server/registerSessionRecordTools.ts:110-137: authenticates the selected file, attempts the session merge and projects the refusal through MCP.src/domain/analysisErrorPresentation.ts:320-321supplies the invalid-or-changed/re-import wording;src/domain/analysisErrorProjection.ts:383emits the reason string without the conflicting identity.Typed outcome or recovery expected
A nonretryable refusal describing the retained/incoming unknown-history conflict and an honest recovery limitation or achievable next action. Preserve authentication checks, divergent-history rejection and complete session atomicity. The exact code, new fields and replacement wording remain implementation choices.
Analysis or suspected cause
Source-derived: the merge conflict uses the general Evidence integrity error without a specific user message, so the shared presentation supplies generic re-import guidance. The ledger knows the existing and incoming revisions when rejecting, but that context is not carried in the error. This explains the observed projection; no implementation fix was made or tested.
Additional context
The open/closed issue and PR search found no matching report whose closure would fix this recovery instruction for valid divergent histories.
update_unknownfailing, while branch updates succeed here. Closed #6300 and merged PR #6321 concern malformed residual graphs, while both generated branches here authenticate.No last-known-good version or regression of those closed fixes is claimed. Documentation does not establish a mandatory import-conflict code or digest-field schema. The narrower failure-reason and recovery correction is sufficient.
Triage assessment