Agentic coding bug index

Trigger

A parent attempt dies while durable children retain running state.

Symptom

New work stays capacity-blocked after the real worker is gone.

Root cause / qualification

Occupancy follows raw workflow status rather than canonical live attempts and leases.

Consequence

The scheduler can stop admitting useful work indefinitely.

Repair pattern

Reconcile attempts, leases and effects; recover only proven dead, effect-free targets.

Regression check

Recover orphan children; reject live or effect-ambiguous recovery; verify zero unrelated changes.

Next acceptance

Read current occupancy and effect receipts before recovery.

BEV-0001 · Dated acceptance report · indexed 2026-10-09

Trigger

Equivalent periodic work enters a later time bucket while a prior attempt is live.

Symptom

Two equivalent monitors occupy the same lane.

Root cause / qualification

Time-bucket deduplication lacks a separate live-equivalence admission gate.

Consequence

Duplicate work competes for capacity and may repeat consequences.

Repair pattern

Add single flight keyed by workflow, lane, version and canonical live state.

Regression check

Equivalent concurrent ingress admits once; distinct lane/version admits; later expiry permits admission.

Next acceptance

Run bounded concurrent ingress acceptance on the deployed admission path.

BEV-0002 · Dated acceptance report · indexed 2026-10-09

Trigger

A predecessor has verified publication but no comparable performance snapshot.

Symptom

A challenger is admitted before a measurable baseline exists.

Root cause / qualification

Effect equivalence and measurement maturity are collapsed into one gate.

Consequence

Learning and experiment claims become unsupported.

Repair pattern

Require publication equivalence, comparable measurement and challenger spacing independently.

Regression check

Published but unmeasured predecessor defers; mature comparable evidence permits admission.

Next acceptance

Read fresh metrics and test missing versus mature snapshots.

BEV-0003 · Dated acceptance report · indexed 2026-10-09

Trigger

Consent, provider availability or low exposure prevents measurement.

Symptom

An agent interprets empty evidence as zero activity.

Root cause / qualification

Missing, blocked, immature and measured-zero states are collapsed.

Consequence

False business conclusions drive unjustified optimisation.

Repair pattern

Preserve explicit unavailable, immature and measured-zero states.

Regression check

Empty connector proves connection only; zero requires an observed measured interval.

Next acceptance

Check current unavailable-state rendering and reporting.

BEV-0004 · Reviewed preventive pattern · indexed 2026-10-09

Trigger

A streamed interaction changes dashboard state during snapshot updates.

Symptom

Attention information disappears and sections partly render no-snapshot.

Root cause / qualification

The recovered repair concerns inconsistent snapshot projection; complete current causality is not established.

Consequence

Operators cannot distinguish absent evidence from operational health.

Repair pattern

Keep snapshot semantics and complete rendering consistent across stream transitions.

Regression check

Exercise Guide during updates; verify attention counts, all sections and missing-snapshot semantics.

Next acceptance

Reproduce the interaction at the exact deployed console revision.

BEV-0005 · Dated acceptance report · indexed 2026-10-09

Trigger

A large document expands into a verbose serialised tool response.

Symptom

Read fails at the response-size boundary although the document is accessible.

Root cause / qualification

An unnecessarily expanded representation exceeds the response budget.

Consequence

Context recovery stalls or the document is falsely reported missing.

Repair pattern

Use compact native reads or bounded windows with explicit coverage.

Regression check

Read a representative large document compactly and verify intended content and bounds.

Next acceptance

Validate the present connector without assuming the old limit is universal.

BEV-0006 · Dated acceptance report · indexed 2026-10-09

Trigger

A dark-theme route hydrates server light-theme markup.

Symptom

React reports a hydration mismatch or replaces content.

Root cause / qualification

Provider initial state differs between server and first client render; delays do not fix the contract.

Consequence

Rendering is unreliable and suppressed warnings conceal the cause.

Repair pattern

Match server and first-client theme state; apply browser preferences after hydration.

Regression check

Check light/dark mobile and desktop first renders and unexpected mismatch warnings.

Next acceptance

Run deployed-route hydration checks across supported browser conditions.

BEV-0007 · Public implementation and dated report · indexed 2026-10-09

Trigger

Installation-token metadata decides customer write admission.

Symptom

Valid work is rejected or App capability stands in for customer writer authority.

Root cause / qualification

Installation capability and authenticated customer permission are treated as one principal.

Consequence

Objective admission is incorrect or exceeds customer authority.

Repair pattern

Check identity-bound customer permission separately from selected App capability.

Regression check

Test reader/writer customers, unselected repositories and missing App permissions independently.

Next acceptance

Complete a fresh permitted customer journey.

BEV-0008 · Public implementation and project state · indexed 2026-10-09

Trigger

A request admitted before deletion completes after cleanup.

Symptom

Registry or credential state reappears.

Root cause / qualification

Session rejection does not fence already-admitted durable writes.

Consequence

Erasure is incomplete under concurrency.

Repair pattern

Fence stale writes at registry and credential destinations using deletion/generation state.

Regression check

Pause admitted work, erase, resume, and verify no indexed state or credential resurrection.

Next acceptance

Revalidate indexed destinations and each actual deletion; track external revocation separately.

BEV-0009 · Public scoped acceptance evidence · indexed 2026-10-09

Trigger

Fulfilment succeeds, evidence fails, then the valid event is redelivered.

Symptom

A duplicate is acknowledged without repairing the missing outcome.

Root cause / qualification

Fulfilment idempotency short-circuits independently incomplete evidence.

Consequence

Successful paid work remains absent from the outcome ledger.

Repair pattern

Reconcile evidence independently of already-completed fulfilment.

Regression check

Fail evidence once, replay, and verify one fulfilment plus one recovered durable outcome.

Next acceptance

Inject controlled evidence failure and read unchanged customer effect counts.

BEV-0010 · Public implementation and dated audit · indexed 2026-10-09

Trigger

An outcome precedes publication evidence and holding persistence fails or fills.

Symptom

The source event can be skipped after cursor acknowledgement.

Root cause / qualification

Acknowledgement precedes successful durable holding.

Consequence

Delayed attribution is permanently lost.

Repair pattern

Persist validated holding before advancing the cursor; retain progress on failure.

Regression check

Inject full storage and persistence failure; verify cursor remains before the event, then recover fairly.

Next acceptance

Run current crash, capacity and restart acceptance with cursor readback.

BEV-0011 · Public implementation review · indexed 2026-10-09

Trigger

A valid payment contains caller-supplied campaign labels.

Symptom

Unsigned labels enter attribution as authenticated source identity.

Root cause / qualification

Payment authenticity is incorrectly extended to unsigned provenance fields.

Consequence

Spoofed attribution corrupts business reporting and learning.

Repair pattern

Validate signed or source-owned attribution separately from payment evidence.

Regression check

Valid payment with unsigned labels stays paid but unattributed; trusted provenance can correlate independently.

Next acceptance

Check forged, absent and valid attribution at the deployed boundary.

BEV-0012 · Public implementation and dated audit · indexed 2026-10-09

Trigger

A minimal brief omits services or supplies an empty list.

Symptom

The handoff passes schema with meaningless numeric service filler.

Root cause / qualification

Optional-input fallback preserves shape without useful output semantics.

Consequence

A successful response cannot support the intended website handoff.

Repair pattern

Handle omitted and empty inputs deliberately; assert meaningful output content.

Regression check

Check both omitted and empty services through the real public journey.

Next acceptance

Recheck merge/deployment and run fresh omitted/empty-input customer acceptance.

BEV-0013 · Public candidate patch · indexed 2026-10-09

Trigger

A tool reads GitHub entities while claiming closed-world annotations.

Symptom

Activation metadata misdescribes actual behaviour.

Root cause / qualification

Read-only is confused with no external-world interaction.

Consequence

Provider activation and agent interpretation rely on inaccurate metadata.

Repair pattern

Annotate external readers accurately and retain compatibility checks for local validators.

Regression check

Inspect actual tools/list; separate external readers and local validators; retain version checks.

Next acceptance

Verify production discovery, conversational routing and settled publication separately.

BEV-0014 · Public merged repair · indexed 2026-10-09

Trigger

Telemetry is queried through legacy Workers Analytics Engine SQL.

Symptom

Request/parsing errors or unweighted aggregates misstate outcomes.

Root cause / qualification

Request format, response parsing and explicit legacy sample weighting are mismatched.

Consequence

Transport success or volume becomes a false usage or demand claim.

Repair pattern

Use actual raw-SQL and response contracts, weighting and transport/tool outcome separation.

Regression check

Validate real response, weighted aggregates and HTTP-success/tool-failure separation.

Next acceptance

Revalidate endpoint semantics and report sampling and identity limits.

BEV-0015 · Public merged repair · indexed 2026-10-09

Trigger

Docs, warnings and projections are maintained independently.

Symptom

Unknown evidence appears healthy or automatic work appears manual.

Root cause / qualification

Units, ownership and recovery semantics lack a shared executable contract.

Consequence

Operators take incorrect actions or accept unsupported health.

Repair pattern

Generate references/examples from versioned canonical field and warning contracts.

Regression check

Check warning semantics, units, missing values and projection parity against fixtures.

Next acceptance

Check deployed UI, generated docs and contract version together.

BEV-0016 · Public implementation and dated report · indexed 2026-10-09

Trigger

The list still says not submitted after submission of the same draft.

Symptom

List and settled detail disagree about in-review state.

Root cause / qualification

State propagation is a candidate explanation; provider internals were not established.

Consequence

An agent may retry an already completed consequential action.

Repair pattern

Read same-draft settled detail and action receipt before deciding on a retry.

Regression check

Stale list plus settled in-review detail must trigger readback rather than duplicate submission.

Next acceptance

Retain exact draft/action locators and verify settled state before retry.

BEV-0017 · Dated observed state reconciliation · indexed 2026-10-09

Trigger

The highest result is a test, HTTP success, owner demo or merge.

Symptom

Agent reports deployed or customer-complete without matching evidence.

Root cause / qualification

Implementation, transport, release, publication and customer outcome become one done state.

Consequence

Later work resumes from an unsupported assumption.

Repair pattern

Record highest evidenced transition with revision, environment, principal and limits.

Regression check

Merged without deployment stays merged; owner success without fresh customer journey stays owner-scoped.

Next acceptance

Collect the missing deployment, provider or customer evidence for the claimed outcome.

BEV-0018 · Reviewed preventive pattern · indexed 2026-10-09

Trigger

An agent sends POST, PUT, PATCH or DELETE to a GET-only discovery endpoint.

Symptom

The framework returns HTML with HTTP 200 instead of rejecting the unsupported method.

Root cause / qualification

A missing method handler falls through to the application renderer; declaring GET alone does not enforce HTTP method rejection.

Consequence

Agent clients can mistake a successful HTTP response for an accepted write or handoff.

Repair pattern

Declare explicit write-method handlers returning 405 with Allow: GET on each read-only JSON route.

Regression check

Check POST, PUT, PATCH and DELETE against registry, integration brief and coding bug JSON: all twelve pairs must return 405 and Allow: GET.

Next acceptance

Verify method rejection on the exact deployed origin after release.

BEV-0019 · Public implementation and dated report · indexed 2026-10-09

Trigger

The catalogue renders long source paths inside nested grids at a 390-pixel phone viewport.

Symptom

The shop has horizontal page overflow despite metadata text using truncation.

Root cause / qualification

Grid tracks and cards retain automatic minimum content sizing; long metadata can impose its intrinsic width before truncation applies.

Consequence

Agent operators cannot inspect the complete catalogue within the phone viewport.

Repair pattern

Use explicit single-column mobile tracks and minmax(0,1fr), and allow catalogue content and cards to shrink with min-w-0.

Regression check

At phone width, document scrollWidth must not exceed window innerWidth on shop, controls and bug routes; preserve desktop grids and source-path truncation.

Next acceptance

Verify phone-width catalogue pages against the exact deployed release.

BEV-0020 · Public implementation and dated report · indexed 2026-10-09