> ## Documentation Index > Fetch the complete documentation index at: https://docs.goosybear.ai/llms.txt > Use this file to discover all available pages before exploring further. # Call videos.set_thumbnails > Pick one of the three pictures Goosy made as the one a video or a short goes out with — 'use this one as the thumbnail', 'set this picture as the cover'. Send `kind` "video" with `video_id` and `thumbnail_id`, or "short" with `short_id` and `cover_id`, the id taken from the edit you read back with `videos.read_edit` — never a description and never a position. Afterwards, say which picture it goes out with, in the quiet line's own words. A short goes out with its own FIRST FRAME by default, because its cover and its opening frame should be the same picture; if the person chooses another, say which one was the first frame. It makes no new pictures: the three are made when it is edited, and never name a price. Not for editing the video or short itself — that is `videos.plan_edit`. Every result names the workspace it ran in. Say which workspace the answer is about. When the account has more than one workspace and none is selected, this tool refuses with `workspace_ambiguous` and lists the choices — offer them, never pick one. ## OpenAPI ````yaml /openapi.json post /api/v1/tools/videos.set_thumbnails openapi: 3.1.0 info: title: Goosy Bear API version: 1.0.0-beta summary: Manage workspace content, projects, Data tables, Pages, library and credits. description: >- BETA. This API is in beta: paths, request shapes and response envelopes may change, and every response carries an `x-goosy-api: beta` header for as long as that is true. A change is additive, or it is deprecated first: a response to a call that uses a deprecated feature carries `Deprecation` and `Sunset` headers, and nothing is removed until at least 90 days after its deprecation. Pin the OpenAPI document you generated against and re-generate when it changes. servers: - url: https://app.goosybear.ai description: Production security: - tenantApiKey: [] paths: /api/v1/tools/videos.set_thumbnails: post: tags: - videos summary: Call videos.set_thumbnails description: >- Pick one of the three pictures Goosy made as the one a video or a short goes out with — 'use this one as the thumbnail', 'set this picture as the cover'. Send `kind` "video" with `video_id` and `thumbnail_id`, or "short" with `short_id` and `cover_id`, the id taken from the edit you read back with `videos.read_edit` — never a description and never a position. Afterwards, say which picture it goes out with, in the quiet line's own words. A short goes out with its own FIRST FRAME by default, because its cover and its opening frame should be the same picture; if the person chooses another, say which one was the first frame. It makes no new pictures: the three are made when it is edited, and never name a price. Not for editing the video or short itself — that is `videos.plan_edit`. Every result names the workspace it ran in. Say which workspace the answer is about. When the account has more than one workspace and none is selected, this tool refuses with `workspace_ambiguous` and lists the choices — offer them, never pick one. operationId: call_videos_set_thumbnails parameters: - name: x-request-id in: header required: false description: >- Your own id for this request, echoed back and recorded on the audit trail. 1–128 characters from `A–Z a–z 0–9 . _ : -`, starting with a letter or digit; anything else is replaced by a generated id. schema: type: string maxLength: 128 requestBody: required: false content: application/json: schema: type: object properties: kind: description: >- What it acts on: "video" for one video, "short" for one short. Leave it out for a video. type: string enum: - video - short video_id: type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12})$ description: >- Only with kind "video". The video's id, as given in this conversation. thumbnail_id: type: string minLength: 1 description: >- Only with kind "video". Which of the three pictures to use, by its id. short_id: type: string minLength: 1 description: >- Only with kind "short". The short's id, as the board or a read projection gave it. cover_id: type: string minLength: 1 description: >- Only with kind "short". Which of the three covers to use, by its id. workspace: description: >- Which workspace to run in — its slug. Omit to use your default. With more than one reachable workspace and no default, the call is refused and the choices are listed. type: string minLength: 1 additionalProperties: false responses: '200': description: >- The call was admitted and dispatched. `ok` says whether the tool succeeded — a refusal the tool itself produced is still a 200, exactly as it is a successful JSON-RPC result over MCP. headers: x-goosy-api: description: Present while this API is in beta; the value is `beta`. schema: type: string const: beta x-request-id: description: >- This request's id: the `x-request-id` you sent when it was well formed, otherwise one generated for you. Quote it to support; it is recorded on every audit row the call wrote. schema: type: string RateLimit-Limit: description: Requests this key may make in a rolling minute. schema: type: integer minimum: 1 RateLimit-Remaining: description: Requests left in the current rolling minute. schema: type: integer minimum: 0 RateLimit-Reset: description: Whole seconds until the window frees more requests. schema: type: integer minimum: 1 x-goosy-tool-error: description: >- `true` when a boundary step refused the call — workspace resolution failed or could not be read. A tool that ran and returned its own typed `ok: false` reports `false` here. **Branch on `ok` in the body for the outcome; this header is the transport-level hint.** schema: type: string enum: - 'true' - 'false' content: application/json: schema: oneOf: - type: object description: The tool ran and answered. properties: ok: type: boolean const: true video_id: type: string thumbnails: type: array items: type: object properties: id: type: string note: type: string picked: type: boolean required: - id - note - picked additionalProperties: false open_at: type: string short_id: type: string covers: readOnly: true type: array items: type: object properties: id: type: string note: type: string picked: type: boolean first_frame: type: boolean word_above_face: type: boolean drawn: type: boolean required: - id - note - picked - first_frame - word_above_face - drawn additionalProperties: false workspace: type: string description: The slug of the workspace this call ran in. working_in: type: object properties: label: type: string description: 'The chip words — e.g. "working in: Acme Main".' note: type: string description: >- Why this workspace — e.g. "your default", "this call only". workspace: type: string description: The resolved workspace's slug. source: type: string enum: - call-override - key-pin - stored-default - sole-reachable description: >- Why this workspace was chosen: the call named it (`call-override`), the key is pinned to it (`key-pin`), it is your default (`stored-default`), or it is the only one the key reaches (`sole-reachable`). required: - label - note - workspace - source description: >- Which workspace this call ran in, and how that was decided. Present on every workspace-scoped result. additionalProperties: false required: - ok - open_at - working_in - workspace - $ref: '#/components/schemas/ToolRefusal' '400': description: >- The request could not be used: the body is present but not a JSON object (`tenant_api.malformed_body`); it is a top-level array carrying more messages than this endpoint accepts (`tenant_mcp.batch_too_large`); or the `Idempotency-Key` header is malformed (`tenant_api.idempotency_key_invalid`), disagrees with the body's `idempotency_key` (`tenant_api.idempotency_key_conflict`), or was sent to an action that cannot replay a retry (`tenant_api.idempotency_unsupported`). Nothing ran. headers: x-goosy-api: description: Present while this API is in beta; the value is `beta`. schema: type: string const: beta x-request-id: description: >- This request's id: the `x-request-id` you sent when it was well formed, otherwise one generated for you. Quote it to support; it is recorded on every audit row the call wrote. schema: type: string Deprecation: description: >- RFC 9745: this refusal's nested `error` object is deprecated, since this instant (`@`). schema: type: string Sunset: description: >- RFC 8594: the nested `error` object may be removed after this date (2026-12-31). schema: type: string Link: description: The page that says what to read instead (`rel="deprecation"`). schema: type: string RateLimit-Limit: description: Requests this key may make in a rolling minute. schema: type: integer minimum: 1 RateLimit-Remaining: description: Requests left in the current rolling minute. schema: type: integer minimum: 0 RateLimit-Reset: description: Whole seconds until the window frees more requests. schema: type: integer minimum: 1 content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: >- No bearer credential, or one that did not resolve. Deliberately ONE undifferentiated answer for absent / unknown / revoked / expired, so the endpoint is never an oracle over the key space. headers: x-goosy-api: description: Present while this API is in beta; the value is `beta`. schema: type: string const: beta x-request-id: description: >- This request's id: the `x-request-id` you sent when it was well formed, otherwise one generated for you. Quote it to support; it is recorded on every audit row the call wrote. schema: type: string Deprecation: description: >- RFC 9745: this refusal's nested `error` object is deprecated, since this instant (`@`). schema: type: string Sunset: description: >- RFC 8594: the nested `error` object may be removed after this date (2026-12-31). schema: type: string Link: description: The page that says what to read instead (`rel="deprecation"`). schema: type: string content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: >- The credential is good but the surface is not open to it — the platform or account API switch is off, or the holder lacks the `api.access` capability. The `code` says which. headers: x-goosy-api: description: Present while this API is in beta; the value is `beta`. schema: type: string const: beta x-request-id: description: >- This request's id: the `x-request-id` you sent when it was well formed, otherwise one generated for you. Quote it to support; it is recorded on every audit row the call wrote. schema: type: string Deprecation: description: >- RFC 9745: this refusal's nested `error` object is deprecated, since this instant (`@`). schema: type: string Sunset: description: >- RFC 8594: the nested `error` object may be removed after this date (2026-12-31). schema: type: string Link: description: The page that says what to read instead (`rel="deprecation"`). schema: type: string content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: >- No such tool. The body names no tool and is identical for every unrecognised name. headers: x-goosy-api: description: Present while this API is in beta; the value is `beta`. schema: type: string const: beta x-request-id: description: >- This request's id: the `x-request-id` you sent when it was well formed, otherwise one generated for you. Quote it to support; it is recorded on every audit row the call wrote. schema: type: string Deprecation: description: >- RFC 9745: this refusal's nested `error` object is deprecated, since this instant (`@`). schema: type: string Sunset: description: >- RFC 8594: the nested `error` object may be removed after this date (2026-12-31). schema: type: string Link: description: The page that says what to read instead (`rel="deprecation"`). schema: type: string RateLimit-Limit: description: Requests this key may make in a rolling minute. schema: type: integer minimum: 1 RateLimit-Remaining: description: Requests left in the current rolling minute. schema: type: integer minimum: 0 RateLimit-Reset: description: Whole seconds until the window frees more requests. schema: type: integer minimum: 1 content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: >- Over this key's per-minute cap. Carries `Retry-After` and `error.retry_after_seconds`. headers: x-goosy-api: description: Present while this API is in beta; the value is `beta`. schema: type: string const: beta x-request-id: description: >- This request's id: the `x-request-id` you sent when it was well formed, otherwise one generated for you. Quote it to support; it is recorded on every audit row the call wrote. schema: type: string Deprecation: description: >- RFC 9745: this refusal's nested `error` object is deprecated, since this instant (`@`). schema: type: string Sunset: description: >- RFC 8594: the nested `error` object may be removed after this date (2026-12-31). schema: type: string Link: description: The page that says what to read instead (`rel="deprecation"`). schema: type: string RateLimit-Limit: description: Requests this key may make in a rolling minute. schema: type: integer minimum: 1 RateLimit-Remaining: description: Requests left in the current rolling minute. schema: type: integer minimum: 0 RateLimit-Reset: description: Whole seconds until the window frees more requests. schema: type: integer minimum: 1 Retry-After: description: Whole seconds to wait before retrying. schema: type: integer minimum: 1 content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: ToolRefusal: type: object properties: ok: type: boolean const: false code: type: string description: >- The typed reason — e.g. `workspace_ambiguous`, `invalid_arguments`, or the tool's own failure code. message: type: string description: A sentence a person can act on. workspaces: description: 'On a workspace refusal: the slugs this key may pass as `workspace`.' type: array items: type: string issues: description: 'On `invalid_arguments`: which fields failed, and why.' type: array items: type: object properties: path: type: string message: type: string required: - path - message additionalProperties: false path: description: >- On an authoring refusal: where in your call's input it points, e.g. `steps..params.`. type: string fix: description: 'On an authoring refusal: the change to your call that would pass.' type: string instruction: description: 'On an authoring refusal: what to do next with it.' type: string required: - ok - code - message description: A call that was admitted and dispatched, and did not succeed. additionalProperties: false Error: type: object properties: ok: type: boolean const: false code: type: string description: >- The typed refusal code — e.g. `tenant_mcp.rate_limited`, `tenant_api.unknown_tool`. message: type: string description: A sentence a person can act on. retry_after_seconds: description: 'On a 429: whole seconds to wait. Mirrors `Retry-After`.' type: number error: type: object properties: code: type: string message: type: string retry_after_seconds: type: number required: - code - message description: >- Deprecated: the same values as the top-level fields, kept until 2026-12-31. Read `code` and `message` at the top level. additionalProperties: false required: - ok - code - message - error description: >- A request the boundary refused before dispatching anything. The same shape the MCP endpoint answers its own refusals with, and the same top-level fields a dispatched call's refusal carries, so one client branch covers both. additionalProperties: false securitySchemes: tenantApiKey: type: http scheme: bearer description: >- An API key minted at Settings › API & MCP. Send it as `Authorization: Bearer `. A key carries its holder's own permissions, resolved on every call — revoking a membership closes the key's reach immediately. Keep it in an environment variable (`GOOSY_API_KEY`), never in a committed file. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.