> ## Documentation Index > Fetch the complete documentation index at: https://cool.computer/docs/llms.txt > Use this file to discover all available pages before exploring further. # Upload an operator attachment > Uploads one file as the raw request body for a later message's attachment_ids (at most 8 per message). The bytes decide the kind, never Content-Type: a PNG, JPEG, GIF or WebP image of up to 20 MiB, 25 megapixels and 16384 pixels on a side, stored as the model receives it (within 2000x2000 and 4.5 MiB of base64; larger images are oriented, scaled and re-encoded, and width and height report the stored size). An image carrying metadata (EXIF such as orientation or GPS, XMP, IPTC, comments or PNG text) is oriented and re-encoded so no metadata is stored, a GIF is stored as a PNG of its first frame, animated PNG and WebP are refused, and an image whose decoding would take too much memory (such as a large progressive or 16-bit image) is refused with 413; an MP4, MOV or WebM video of up to 32 MiB, which is copied to the message's selected computer for the agent to inspect; or a UTF-8 text file of up to 1 MiB with its media type in Content-Type. A refusal says what to change; 413 means the file is too large. A member keeps at most 32 unsent uploads and 256 MiB, and an account stores at most 512 attachments and 1 GiB until their chats are deleted (429). An account uploads at most 2 files at once; another is refused with 429 attachment_upload_busy and Retry-After. Callers: the account owner with a user API key, user access token, claimed agent access token, or MCP token; organization API keys are refused. ## OpenAPI ````yaml https://www.cool.computer/openapi.json post /api/operator/attachments openapi: 3.1.0 info: title: Cool Computers API version: 1.0.0 description: >- Create and operate reachable Linux computers. Each computer keeps a stable name.cool.computer address, persistent files, and agent-ready command execution. REST requests use UTC-aligned one-minute limits: 600 requests per account identified by a recognized valid account bearer credential, a separate 600-request budget per computer-scoped credential, or 60 requests per source IP otherwise. Read-only GETs answered from API state spend a separate read budget reported as account-read or computer-read, so status polling cannot exhaust the budget that protects work and mutations. To bound authentication-provider traffic, at most 60 first-seen bearer values are checked per source IP in a minute; recognized valid credentials use their account or computer policy. Successful bearer authentication is reused for at most five seconds; transient provider failures are not cached. Revoking a credential through this API (POST /api/auth/logout or DELETE /api/api-keys/{id}) drops that reuse in every serving process, so the revoked credential is refused from the next request on; only if that announcement fails does another process keep admitting it, for at most five seconds. JSON request bodies must be sent with Content-Type: application/json; any other body answers 415 unsupported_media_type. Every error is an application/problem+json object whose type links to https://cool.computer/docs/api-reference/errors; a malformed body names the unknown field, the wrong type, or the byte where the JSON breaks. Non-exempt API responses include the structured RateLimit and RateLimit-Policy fields; request admission 429 responses use code api_request_rate_exceeded and also include Retry-After. Health, OpenAPI, webhooks, callbacks, SSE, and WebSocket endpoints are exempt from the REST request budget. Authenticated SSE connection attempts remain subject to the authentication safeguards and can receive the same typed 429 response. servers: - url: https://api.cool.computer description: Canonical API origin security: [] tags: - name: Authentication description: Obtain and manage bearer credentials. - name: Billing description: Inspect and manage the account's no-card trial or Pro plan. - name: Computers description: Create, inspect, and delete resident computers. - name: Execution description: Run commands on a computer. - name: Files description: Read and change a computer's persistent files. - name: Publishing description: >- Publish files to a computer's URL as immutable releases, with no VM. To show something, publish the files; to run something, use the computer (exec, terminal, services), which gets Linux on first use. - name: Services description: >- Manage processes and select the HTTP port exposed at a computer's stable address. - name: Email description: Read and send mail through a computer's inbox. - name: Comments description: >- Notes people leave on a computer's page, when its owner switched comments on: the owner, the people it is shared with and, when the computer is public, any signed-in person. The owner's agent reads every open note and resolves it. - name: Network description: Control a computer's public visibility and outbound network policy. - name: Sharing description: Invite people to use a computer without granting owner controls. - name: Public description: Unauthenticated discovery endpoints. - name: Secrets description: Inspect secret sets and their audit history; values are never returned. - name: Providers description: Inspect connected coding-agent provider credentials. - name: GitHub description: Inspect the GitHub App installations connected to the account. - name: Terminals description: Inspect a computer's terminal sessions. - name: Operator description: Read the operator agent's conversations, turns, and events. - name: Feedback description: >- Tell the Cool Computers team what works and what does not, with or without an account. externalDocs: description: Cool Computers agent registration guide url: https://www.cool.computer/auth.md paths: /api/operator/attachments: post: tags: - Operator summary: Upload an operator attachment description: >- Uploads one file as the raw request body for a later message's attachment_ids (at most 8 per message). The bytes decide the kind, never Content-Type: a PNG, JPEG, GIF or WebP image of up to 20 MiB, 25 megapixels and 16384 pixels on a side, stored as the model receives it (within 2000x2000 and 4.5 MiB of base64; larger images are oriented, scaled and re-encoded, and width and height report the stored size). An image carrying metadata (EXIF such as orientation or GPS, XMP, IPTC, comments or PNG text) is oriented and re-encoded so no metadata is stored, a GIF is stored as a PNG of its first frame, animated PNG and WebP are refused, and an image whose decoding would take too much memory (such as a large progressive or 16-bit image) is refused with 413; an MP4, MOV or WebM video of up to 32 MiB, which is copied to the message's selected computer for the agent to inspect; or a UTF-8 text file of up to 1 MiB with its media type in Content-Type. A refusal says what to change; 413 means the file is too large. A member keeps at most 32 unsent uploads and 256 MiB, and an account stores at most 512 attachments and 1 GiB until their chats are deleted (429). An account uploads at most 2 files at once; another is refused with 429 attachment_upload_busy and Retry-After. Callers: the account owner with a user API key, user access token, claimed agent access token, or MCP token; organization API keys are refused. operationId: createOperatorAttachment parameters: - name: filename in: query required: true description: The file's name. schema: type: string minLength: 1 requestBody: required: true content: '*/*': schema: type: string format: binary maxLength: 33554432 responses: '201': headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: The stored attachment. content: application/json: schema: $ref: '#/components/schemas/OperatorAttachment' '400': headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: Bad Request. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' '401': $ref: '#/components/responses/Unauthorized' '403': headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: Forbidden. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' '413': headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: Payload Too Large. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' default: $ref: '#/components/responses/Problem' security: - bearerAuth: [] components: headers: RateLimit: description: >- The applied policy name, requests remaining after this request, and whole seconds until the current UTC-aligned window resets. schema: type: string pattern: >- ^"(account|account-read|computer|computer-read|source|comment-board|comment-live)";r=[0-9]+;t=([1-9]|[1-5][0-9]|60)$ examples: - '"account";r=599;t=42' - '"computer-read";r=598;t=42' RateLimit-Policy: description: >- The selected policy name, quota, and window in seconds. Valid account credentials use account or account-read with q=600, computer credentials use computer or computer-read with q=600, unauthenticated or unrecognized requests use source with q=60 for their source IP, a browser session's read of a comment board uses comment-board with q=300 for its source IP, and its handshake of a comment live channel uses comment-live with q=60 for its source IP. schema: type: string pattern: >- ^("(account|account-read|computer|computer-read)";q=600|"source";q=60|"comment-board";q=300|"comment-live";q=60);w=60$ examples: - '"account";q=600;w=60' - '"computer-read";q=600;w=60' Retry-After: description: >- Whole seconds to wait after an api_request_rate_exceeded, comment_rate_exceeded, comment_site_rate_exceeded, comment_live_full or computer_starting response before retrying (up to 3600 for comment_site_rate_exceeded, whose window is an hour). Other 429 problem codes describe separate resource or provider limits and do not inherit this retry value. schema: type: integer minimum: 1 maximum: 3600 examples: - 42 schemas: OperatorAttachment: type: object additionalProperties: false required: - id - filename - media_type - size_bytes properties: id: type: string filename: type: string media_type: type: string description: >- image/png, image/jpeg, image/gif, image/webp, video/mp4, video/quicktime, video/webm, or a text type. size_bytes: type: integer minimum: 0 width: type: integer minimum: 1 description: An image's stored width, the width the model sees. height: type: integer minimum: 1 description: An image's stored height, the height the model sees. Problem: type: object additionalProperties: false required: - type - title - status - code - detail properties: type: type: string format: uri description: >- https://cool.computer/docs/api-reference/errors, the page that explains every code. title: type: string status: type: integer minimum: 400 maximum: 599 code: type: string pattern: ^[a-z0-9_]+$ detail: type: string resolution: type: string context: type: object additionalProperties: true responses: Unauthorized: headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: Unauthorized. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' TooManyRequests: headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' Retry-After: $ref: '#/components/headers/Retry-After' description: >- Too Many Requests. If the problem code is api_request_rate_exceeded, wait for Retry-After seconds; other problem codes describe a separate limit. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' InternalServerError: headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: Internal Server Error. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' Problem: headers: RateLimit: $ref: '#/components/headers/RateLimit' RateLimit-Policy: $ref: '#/components/headers/RateLimit-Policy' description: >- A machine-readable API error with a stable code and recovery instruction. content: application/problem+json: schema: $ref: '#/components/schemas/Problem' securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: WorkOS user or agent access token, or Cool Computers API key description: >- A Cool Computers API key, user access token, or claimed agent access token in the Authorization header. Follow https://www.cool.computer/auth.md for agent registration and https://www.cool.computer/authentication.md for direct user credentials. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.