> ## Documentation Index > Fetch the complete documentation index at: https://docs.trunk.io/llms.txt > Use this file to discover all available pages before exploring further. # Estimate when a queued pull request will merge > Returns a live estimate for this pull request's queue entry: when it is expected to merge, when it starts and finishes testing, and how many pull requests it is waiting behind. An entry in `pendingFailure` instead reports when that failure is expected to resolve (`kind: pendingFailureResolution`) and which pull requests it is waiting on. The estimate is computed on each request by simulating the queue forward, so it changes as the queue moves. Read it when the answer is needed rather than in a tight loop: each call runs a fresh simulation, and like the other pull-request reads it is rate-limited per caller. When no estimate can be given — a queue with too little test history, a pull request that is not ready yet, a paused queue — the response says why (`status: unavailable`, `reason`). Not every queue serves estimates yet: one that does not answers 404 `ESTIMATE_NOT_ENABLED`. ## OpenAPI ````yaml /openapi-v2.json get /v2/pull-requests/{id}/queue-entry-estimate openapi: 3.1.0 info: title: Trunk API version: 2.0.0 description: >- The Trunk public API. Every endpoint is scoped to a single organization and requires a credential. ## Authentication For automation, send an API key as `Authorization: Bearer `. An organization admin creates one in the Trunk app under **Settings → Developer → API Keys**, and chooses the merge-queue permissions it holds. A key with no permissions can read merge queues but change nothing. Those permissions scope merge queue only: every key can use the Flaky Tests and Dynamic CI endpoints, including their writes, whatever permissions it holds. A short-lived first-party token in the `x-trunk-token` header is what the `trunk` CLI sends after `trunk auth login`. A GitHub Actions job can upload impacted targets with no Trunk secret: the `trunk-io/login` action exchanges the run's own GitHub credential (its OIDC token, or on a pull request from a fork its `GITHUB_TOKEN`) for a short-lived first-party token. That token is accepted only by `PUT /v2/impacted-targets`, for the run's own repository — and on a fork pull request, only for that pull request and its head sha. ## Errors Every 4xx and 5xx response is a `ErrorResponse`: `{ "error": { "code", "message" } }`. Switch on `code`, which is stable; `message` is prose and may change at any time. **An authorization denial on a read is reported as `404`, not `403`** — whether a resource exists must not leak across organizations, so a resource in another organization is indistinguishable from one that does not exist. `403 INSUFFICIENT_PERMISSIONS` means the credential is valid but is not permitted the action (or carries no organization). Every response carries an `X-Request-Id` header. Quote it in support requests. ## Rate limiting Requests are limited per organization (currently 100 requests/second). Exceeding it returns `429` with `RATE_LIMIT_EXCEEDED`; retry with backoff. Note that the limit is enforced at the edge, which does not yet wrap its `429` in the `ErrorResponse` envelope described above — treat any `429` as rate limiting regardless of body. ## Compatibility Within v2, Trunk may add: new endpoints, new **optional** response fields, new members to any enum (including new `code` values, new queue-entry states, and new providers), and new optional request parameters. **Clients must tolerate values and fields they do not recognize** rather than failing closed — a client that switches exhaustively over an enum will break when a member is added. Removals and semantic changes require a new major version. ## Provider support Merge queues, verification runs and checks are **GitHub-only** today; `Check.provider` has a single member for that reason. Impacted-target uploads additionally require a `github.com` repository named `owner/repo`. The `Provider` enum lists values the repository index can store, not surfaces that are fully supported. ## Not yet available A pull request's numeric **position** in its queue is not exposed, and list responses are not ordered by queue position. `GET /v2/merge-queues/{id}/order` returns the order the engine will consider pull requests in, but an array index there is not a wait: use a pending entry's `directlyAhead` rather than counting, and `GET /v2/pull-requests/{id}/queue-entry-estimate` for when it is expected to merge (on queues that serve estimates). This API delivers no events of its own — poll it, or subscribe to [Merge Queue's webhooks](https://docs.trunk.io/merge-queue/webhooks). `Idempotency-Key` is not yet honored, so a mutation that times out must be reconciled by reading the resource back rather than blindly retried. contact: name: Trunk Support url: https://docs.trunk.io servers: - url: https://api.trunk.io description: Production security: - apiKey: [] - trunkToken: [] tags: - name: mergeQueues x-group: Merge Queues - name: pullRequests x-group: Pull Requests - name: mergeQueueVerificationRuns x-group: Verification Runs - name: impactedTargets x-group: Impacted Targets - name: repositories x-group: Repositories - name: dynamicCi x-group: Dynamic CI - name: ciJobs x-group: CI Jobs - name: ciWorkflowRuns x-group: CI Workflow Runs - name: ciFailureClusters x-group: CI Failure Clusters - name: testCollections x-group: Test Collections - name: tests x-group: Tests - name: testUploads x-group: Test Uploads paths: /v2/pull-requests/{id}/queue-entry-estimate: get: tags: - pullRequests summary: Estimate when a queued pull request will merge description: >- Returns a live estimate for this pull request's queue entry: when it is expected to merge, when it starts and finishes testing, and how many pull requests it is waiting behind. An entry in `pendingFailure` instead reports when that failure is expected to resolve (`kind: pendingFailureResolution`) and which pull requests it is waiting on. The estimate is computed on each request by simulating the queue forward, so it changes as the queue moves. Read it when the answer is needed rather than in a tight loop: each call runs a fresh simulation, and like the other pull-request reads it is rate-limited per caller. When no estimate can be given — a queue with too little test history, a pull request that is not ready yet, a paused queue — the response says why (`status: unavailable`, `reason`). Not every queue serves estimates yet: one that does not answers 404 `ESTIMATE_NOT_ENABLED`. operationId: pullRequests.queueEntryEstimate parameters: - schema: type: string format: uuid description: The pull request's id. example: 0f8fad5b-d9cb-469f-a165-70867728950e required: true description: The pull request's id. name: id in: path responses: '200': description: The entry's estimate, or why there is none content: application/json: schema: $ref: '#/components/schemas/QueueEntryEstimate' '400': description: '`VALIDATION_FAILED`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: VALIDATION_FAILED: summary: VALIDATION_FAILED value: error: code: VALIDATION_FAILED message: 'Invalid input: expected string, received undefined' '401': description: '`AUTHENTICATION_REQUIRED` | `INVALID_TOKEN`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: AUTHENTICATION_REQUIRED: summary: AUTHENTICATION_REQUIRED value: error: code: AUTHENTICATION_REQUIRED message: No credential was supplied INVALID_TOKEN: summary: INVALID_TOKEN value: error: code: INVALID_TOKEN message: The supplied token failed verification '403': description: '`INSUFFICIENT_PERMISSIONS`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: INSUFFICIENT_PERMISSIONS: summary: INSUFFICIENT_PERMISSIONS value: error: code: INSUFFICIENT_PERMISSIONS message: >- The supplied credential is missing the required permission '404': description: '`PR_NOT_FOUND` | `ESTIMATE_NOT_ENABLED`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: PR_NOT_FOUND: summary: PR_NOT_FOUND value: error: code: PR_NOT_FOUND message: Pull request not found ESTIMATE_NOT_ENABLED: summary: ESTIMATE_NOT_ENABLED value: error: code: ESTIMATE_NOT_ENABLED message: >- Estimates are not enabled for this pull request's merge queue '409': description: '`PR_NOT_IN_ACTIVE_STATE`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: PR_NOT_IN_ACTIVE_STATE: summary: PR_NOT_IN_ACTIVE_STATE value: error: code: PR_NOT_IN_ACTIVE_STATE message: This pull request is not in an active queue state '429': description: '`RATE_LIMIT_EXCEEDED`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: RATE_LIMIT_EXCEEDED: summary: RATE_LIMIT_EXCEEDED value: error: code: RATE_LIMIT_EXCEEDED message: Rate limit exceeded; retry after the Retry-After delay '500': description: '`INTERNAL_ERROR`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: INTERNAL_ERROR: summary: INTERNAL_ERROR value: error: code: INTERNAL_ERROR message: An unexpected error occurred '502': description: '`UPSTREAM_ERROR`' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: UPSTREAM_ERROR: summary: UPSTREAM_ERROR value: error: code: UPSTREAM_ERROR message: An upstream service did not respond components: schemas: QueueEntryEstimate: oneOf: - $ref: '#/components/schemas/AvailableQueueEntryEstimate' - $ref: '#/components/schemas/UnavailableQueueEntryEstimate' discriminator: propertyName: status mapping: available: '#/components/schemas/AvailableQueueEntryEstimate' unavailable: '#/components/schemas/UnavailableQueueEntryEstimate' description: >- A live estimate for a queued pull request, computed by simulating the queue forward from its current state over the queue's recent test history, or why there is none. A point-in-time prediction: a new submission, a priority change or a failure ahead changes it, so read it again when it is needed rather than counting down from one answer. ErrorResponse: type: object properties: error: type: object properties: code: $ref: '#/components/schemas/ErrorCode' message: type: string description: >- Human-readable description of what went wrong. Not stable — do not parse. example: An unexpected error occurred required: - code - message required: - error description: >- The uniform error envelope. Every 4xx and 5xx response in this API has this shape. AvailableQueueEntryEstimate: type: object properties: status: type: string enum: - available example: available computedAt: type: string format: date-time description: >- When the public API received the estimate from the merge service; every other instant is relative to it, so each carries that call's latency. example: '2026-10-07T15:04:05.000Z' kind: $ref: '#/components/schemas/QueueEntryEstimateKind' estimatedAt: type: string format: date-time description: >- For `kind: merge`, the median estimate of when the pull request merges: half of comparable entries finish sooner, half later. For `kind: pendingFailureResolution`, when the failure is expected to resolve — an upper bound, since it waits for every run the failure depends on, while a restart or a passing run behind it can resolve it sooner. example: '2026-10-07T15:24:05.000Z' estimatedAtState: $ref: '#/components/schemas/QueueEntryEstimateTimeState' confidence: $ref: '#/components/schemas/QueueEntryEstimateConfidence' pullRequestsAhead: type: integer description: >- How many pull requests this one depends on and so must merge behind: a count of blockers, not a queue position. In a `graph` queue, pull requests in independent lanes are not counted. Past the graph's soft cap, before the pull request is admitted, it counts every pull request in the queue — an upper bound on its blockers. example: 3 startsTestingAt: type: string format: date-time description: Present while the entry waits for a test slot. example: '2026-10-07T15:09:05.000Z' startsTestingAtState: allOf: - $ref: '#/components/schemas/QueueEntryEstimateTimeState' - description: 'Present exactly when `startsTestingAt` is: how far to trust it.' testsFinishAt: type: string format: date-time description: >- Present while the entry waits or tests: when its verification run is expected to finish passing, including expected restarts. example: '2026-10-07T15:23:05.000Z' testsFinishAtState: allOf: - $ref: '#/components/schemas/QueueEntryEstimateTimeState' - description: 'Present exactly when `testsFinishAt` is: how far to trust it.' typicalTestDurationSeconds: type: integer description: >- The queue's median duration over its recent passing verification runs, in whole seconds rounded down. Absent when the queue has none to report. example: 900 waitingForPullRequestNumbers: type: array items: type: integer maxItems: 10000 description: >- For `pendingFailureResolution`, the pull requests whose runs the failure is waiting on right now; empty otherwise. example: - 4901 sampleSize: type: integer description: >- Passing tested pull requests in the queue's last 14 days the estimate draws on — one per pull request per verification run, so a passing batch of four counts four. example: 120 required: - status - computedAt - kind - estimatedAt - estimatedAtState - confidence - pullRequestsAhead - waitingForPullRequestNumbers - sampleSize description: An estimate the merge service could compute. UnavailableQueueEntryEstimate: type: object properties: status: type: string enum: - unavailable example: unavailable computedAt: type: string format: date-time description: >- When the public API received the estimate from the merge service; every other instant is relative to it, so each carries that call's latency. example: '2026-10-07T15:04:05.000Z' reason: $ref: '#/components/schemas/QueueEntryEstimateUnavailableReason' sampleSize: type: integer description: >- Present for `insufficientHistory` and `unsupportedQueueState`. Passing tested pull requests in the queue's last 14 days the estimate draws on — one per pull request per verification run, so a passing batch of four counts four. example: 3 samplesRequired: type: integer description: >- Present for `insufficientHistory`: the `sampleSize` an estimate needs. example: 8 startsTestingAt: type: string format: date-time description: >- Present for `inBisection` while the entry waits for a test slot in its bisection. example: '2026-10-07T15:09:05.000Z' startsTestingAtState: allOf: - $ref: '#/components/schemas/QueueEntryEstimateTimeState' - description: 'Present exactly when `startsTestingAt` is: how far to trust it.' testsFinishAt: type: string format: date-time description: >- Present for `inBisection` while the entry waits or tests: when its bisection run is expected to finish passing. Passing returns the entry to the queue rather than merging it. example: '2026-10-07T15:23:05.000Z' testsFinishAtState: allOf: - $ref: '#/components/schemas/QueueEntryEstimateTimeState' - description: 'Present exactly when `testsFinishAt` is: how far to trust it.' typicalTestDurationSeconds: type: integer description: >- The queue's median duration over its recent passing verification runs, in whole seconds rounded down. Absent when the queue has none to report. example: 900 required: - status - computedAt - reason description: Why no estimate could be computed. ErrorCode: type: string enum: - AUTHENTICATION_REQUIRED - INVALID_TOKEN - INSUFFICIENT_PERMISSIONS - INTERNAL_ERROR - VALIDATION_FAILED - NOT_FOUND - INVALID_CURSOR - MERGE_QUEUE_NOT_FOUND - PR_ALREADY_ENQUEUED - PR_NOT_ENQUEUEABLE - UPSTREAM_ERROR - VERIFICATION_RUN_NOT_FOUND - PR_NOT_FOUND - REPOSITORY_NOT_FOUND - IMPACTED_TARGETS_UNSUPPORTED - QUEUE_ALREADY_EXISTS - QUEUE_HAS_ACTIVE_ENTRIES - MODE_CHANGE_IN_PROGRESS - PR_NOT_IN_ACTIVE_STATE - MERGE_QUEUE_NOT_CREATABLE - PR_TESTS_NOT_RESTARTABLE - ALLOWED_BOT_SUBMITTERS_FROZEN - ESTIMATE_NOT_ENABLED - PROVIDER_URL_NOT_FOUND - CI_HOST_UNSUPPORTED - CI_SCOPE_NOT_FOUND - CI_JOB_NOT_FOUND - CI_FAILURE_CLUSTER_NOT_FOUND - TEST_COLLECTION_NOT_FOUND - TEST_NOT_FOUND - TEST_UPLOAD_NOT_FOUND - TICKETING_NOT_CONFIGURED - TICKETING_CREDENTIALS_INVALID - TICKETING_SITE_REFUSED - TICKET_NOT_FOUND - TICKET_LINK_CONFLICT - TEST_ALREADY_LINKED - TICKET_FIELDS_REJECTED - TICKET_CONTENT_UNAVAILABLE - TICKETING_CREATE_REFUSED - RATE_LIMIT_EXCEEDED description: >- Stable machine-readable error identifier. Switch on this, never on `message`. A shipped code's meaning never changes, but **new codes may be added within v2** — treat an unrecognized code as a generic failure of its HTTP status rather than failing closed. example: INTERNAL_ERROR QueueEntryEstimateKind: type: string enum: - merge - pendingFailureResolution description: >- `merge`: `estimatedAt` is when the pull request is expected to merge. `pendingFailureResolution`: the entry is in `pendingFailure`, and `estimatedAt` is when the failure is expected to resolve — by a restart, a bisection, a pass, or a failure — not a merge time. example: merge QueueEntryEstimateTimeState: type: string enum: - onTrack - holding - pastTypical - pastP95 description: >- How far to trust the instant it accompanies. `onTrack`: a forecast that moves closer as time passes. `holding`: not counting down, because the queue is waiting on a step it treats as instant (such as a verification run that can start now) or the instant is under a 30-second floor; it does not mean the instant is near. `pastTypical`: held by a run, this entry's or one ahead of it, that is past its typical time, so the instant is likely an underestimate; on `testsFinishAtState` the run is this entry's own, so compare against `typicalTestDurationSeconds`. `pastP95`: only on `testsFinishAtState`, this entry's verification run is taking longer than 95% of the queue's recent passing runs. example: onTrack QueueEntryEstimateConfidence: type: string enum: - low - medium - high description: >- From how much history the queue has, lowered while the entry waits, sits deep in the queue, is held behind a failure, is bisecting, or has a pending failure ahead of it. example: medium QueueEntryEstimateUnavailableReason: type: string enum: - insufficientHistory - notInQueue - queueNotRunning - unsupportedQueueState - estimateFailed - inBisection description: >- `insufficientHistory`: too few passing tested pull requests in the last 14 days — see `sampleSize` and `samplesRequired`. `notInQueue`: the entry is not ready yet, so it holds no position. `queueNotRunning`: the queue is paused, draining or switching modes. `unsupportedQueueState`: the queue's current shape cannot be estimated, for example a dependency cycle or an entry far past the graph's soft cap. `estimateFailed`: the estimate could not be computed; retry later. `inBisection`: the entry is in a bisection, where passing returns it to the queue rather than merging it, and when depends on the rest of the bisection. example: insufficientHistory securitySchemes: apiKey: type: http scheme: bearer description: >- An API key, sent as `Authorization: Bearer `. An organization admin creates one in the Trunk app under **Settings → Developer → API Keys** and chooses the merge-queue permissions it holds; a key with none can read merge queues but change nothing. Those permissions scope merge queue only: every key can use the Flaky Tests and Dynamic CI endpoints, including their writes, whatever permissions it holds. trunkToken: type: apiKey in: header name: x-trunk-token description: >- A short-lived first-party token, sent in the `x-trunk-token` header. The `trunk` CLI sends one after `trunk auth login`, and the `trunk-io/login` action obtains one for a GitHub Actions run. **A token from a GitHub Actions run can only upload impacted targets** (`PUT /v2/impacted-targets`), for the repository the run belongs to; every other endpoint refuses it. ````