> ## Documentation Index > Fetch the complete documentation index at: https://docs.outerlayer.ai/llms.txt > Use this file to discover all available pages before exploring further. # List the factory's runner hosts > Every host that has sent at least one heartbeat, ordered by host name. Each carries the CLI version, the runner protocol and slots it last reported, its last heartbeat time, its last successful request for work, its last error, its last self-update (the versions it moved between, how it ended, and why when it did not succeed; null until it reports one), its low-disk state (`lowDisk`: the free bytes and the bytes it needs, set while the host holds off new work for want of disk and null otherwise), whether it is taking work (`blocked`: the reason, set while the host claims nothing because it cannot run the work it would be given, and null otherwise), and a status derived at read time — never stored — from those timestamps: `stale` when the last heartbeat is older than three times the host's own `pollSeconds`; otherwise `outdated` when the last heartbeat carried a runner protocol below the gateway's minimum; otherwise `failing` when the last request for work failed and no later success cleared it; otherwise `ok`. Unpaginated. ## OpenAPI ````yaml /openapi.yaml get /v1/hosts openapi: 3.0.3 info: contact: email: hello@outerlayer.ai url: https://www.outerlayer.ai description: >- The OuterLayer Gateway API lets you ingest coding-agent sessions and record evidence of work programmatically. Most teams reach it through the `outerlayer` CLI, which calls it for them. Call it directly to build your own integration or to automate what the dashboard does. Versioning: every endpoint is prefixed with `/v1/`. Breaking changes ship under a new version prefix (`/v2/`, etc.) with a 90-day-minimum deprecation window; anything additive lands on the current prefix. Vocabulary: the dashboard calls this API's `app` a **factory** — the unit that owns a set of repositories, the agent sessions worked on them, and the evidence they produce. They are the same entity. The API keeps `app` in its paths, headers, and field names because those are a published contract; only the product surface was renamed. title: OuterLayer Gateway API version: '1.0' servers: - description: Production (OuterLayer Cloud) url: https://api.outerlayer.ai - description: Local dev server (self-hosted gateway) url: http://localhost:9418 security: - AppId: [] BearerAuth: [] tags: - description: >- What a CLI login token can read about its owner without naming a factory, such as the factories they can use. name: Account - description: >- Coding-agent session ingest (outerlayer sync) and content-addressed session images. name: Agents - description: >- Evidence artifacts (screenshots, recordings, reports, logs) emitted as proof of a change and anchored to pull requests. name: Artifacts - description: >- Pass/fail outcomes of checks run in your own CI or compute, anchored to pull requests with the run URL as proof. name: Emitted Results - description: >- The acceptance criteria of a work item, recorded as one list. The Criteria tab, its count and the item status read that list. name: Criteria - description: >- What any agent found wrong about a change under review or about a rule it ran on, recorded on a work item. name: Findings - description: >- Add or remove a source's statement that it is working on an issue or pull request, and read what is currently live. name: Work Items - description: >- What the factory's GitHub App installation lets builds do on each connected repository, and whether each default branch requires a pull request. name: Repositories - description: >- A runner host's heartbeat — its CLI version, slots and last request for work — and the factory's list of hosts with a derived status. name: Hosts - description: Query server feature availability. name: Capabilities - description: Per-model LLM pricing data. Public, unauthenticated. name: Pricing - description: >- Create, list, and revoke factory API keys. Plaintext returned exactly once at creation. name: API Keys - description: >- Factory CRUD — a factory is owned by an organization and is the unit every other resource hangs off. Lets a headless agent provision one without the dashboard. name: Apps - description: >- Agent-coding session list and full transcript reads, with actor-privacy controls for machine keys. name: Sessions - description: >- Per-model token spend and fleet-wide agent behavior tiles, including two-window comparisons. name: Metrics - description: Synced-commit history of the app's `.outerlayer/` context tree. name: Context - description: >- Session→PR attribution: which agent sessions produced which pull requests, and what each attributed PR cost. name: PRs - description: Service health checks. name: Health - description: >- Org member and role administration, authenticated with an org-scoped management API key (`olk_…`) minted in the dashboard's settings. name: Org Management - description: OAuth 2.1 discovery metadata for MCP connector clients. name: OAuth paths: /v1/hosts: get: tags: - Hosts summary: List the factory's runner hosts description: >- Every host that has sent at least one heartbeat, ordered by host name. Each carries the CLI version, the runner protocol and slots it last reported, its last heartbeat time, its last successful request for work, its last error, its last self-update (the versions it moved between, how it ended, and why when it did not succeed; null until it reports one), its low-disk state (`lowDisk`: the free bytes and the bytes it needs, set while the host holds off new work for want of disk and null otherwise), whether it is taking work (`blocked`: the reason, set while the host claims nothing because it cannot run the work it would be given, and null otherwise), and a status derived at read time — never stored — from those timestamps: `stale` when the last heartbeat is older than three times the host's own `pollSeconds`; otherwise `outdated` when the last heartbeat carried a runner protocol below the gateway's minimum; otherwise `failing` when the last request for work failed and no later success cleared it; otherwise `ok`. Unpaginated. operationId: list-hosts responses: '200': content: application/json: schema: properties: data: items: properties: blocked: nullable: true properties: reason: type: string required: - reason type: object cliVersion: type: string host: type: string lastError: nullable: true properties: at: type: string code: type: string message: type: string required: - code - message - at type: object lastHeartbeatAt: type: string lastSuccessAt: nullable: true type: string lastUpdate: nullable: true properties: at: nullable: true type: string from: type: string outcome: enum: - updated - rolled_back - verification_failed - not_published - retrying type: string reason: nullable: true type: string to: type: string required: - from - to - outcome - reason - at type: object lowDisk: nullable: true properties: free: type: integer needed: type: integer required: - free - needed type: object pollSeconds: type: integer runnerProtocol: type: integer slotsTotal: type: integer slotsUsed: type: integer status: enum: - ok - failing - outdated - stale type: string required: - host - cliVersion - runnerProtocol - pollSeconds - slotsUsed - slotsTotal - lastHeartbeatAt - lastSuccessAt - lastError - lastUpdate - lowDisk - blocked - status type: object type: array required: - data type: object description: The factory's hosts. '400': content: application/json: schema: properties: error: properties: code: type: string message: type: string required: - code - message type: object required: - error type: object description: Invalid request parameters (validation failed). '401': content: application/json: schema: properties: error: properties: code: type: string message: type: string required: - code - message type: object required: - error type: object description: Missing or invalid API key. '403': content: application/json: schema: properties: error: properties: code: type: string message: type: string required: - code - message type: object required: - error type: object description: The caller lacks hosts.read. components: securitySchemes: AppId: description: Factory id the request is scoped to. in: header name: X-Outerlayer-App-Id type: apiKey BearerAuth: description: API key (sk_outerlayer_*) scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.