> ## Documentation Index > Fetch the complete documentation index at: https://allhandsai-chore-regenerate-agent-sdk-openapi.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Get Installed Canvas Extension Endpoint > Get information about a specific installed canvas extension. ## OpenAPI ````yaml /openapi/agent-sdk.json get /api/canvas-extensions/installed/{extension_name} openapi: 3.1.0 info: description: OpenHands Agent Server - REST/WebSocket interface for OpenHands AI Agent title: OpenHands Agent Server version: 1.52.0 servers: [] security: [] paths: /api/canvas-extensions/installed/{extension_name}: get: tags: - Canvas Extensions summary: Get Installed Canvas Extension Endpoint description: Get information about a specific installed canvas extension. operationId: >- get_installed_canvas_extension_endpoint_api_canvas_extensions_installed__extension_name__get parameters: - description: Canvas extension name (lowercase alphanumeric, hyphens) in: path name: extension_name required: true schema: description: Canvas extension name (lowercase alphanumeric, hyphens) maxLength: 255 minLength: 1 pattern: ^[a-z0-9]+(?:-[a-z0-9]+)*$ title: Extension Name type: string responses: '200': content: application/json: schema: $ref: '#/components/schemas/InstalledCanvasExtensionResponse' description: Successful Response '404': description: Canvas extension not installed '422': content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' description: Validation Error security: - APIKeyHeader: [] components: schemas: InstalledCanvasExtensionResponse: description: Response containing installed canvas extension information. properties: description: default: '' description: Canvas extension description title: Description type: string enabled: default: false description: Whether the canvas extension is enabled title: Enabled type: boolean install_path: description: Path where the extension is installed title: Install Path type: string installed_at: description: ISO 8601 timestamp of installation title: Installed At type: string manifest: anyOf: - $ref: '#/components/schemas/CanvasExtensionManifest' - type: 'null' description: >- The extension's validated manifest (display_name, contributes.pages, ...). None if the installed manifest can no longer be read. name: description: Canvas extension name title: Name type: string repo_path: anyOf: - type: string - type: 'null' description: Subdirectory path within the repository title: Repo Path resolved_ref: anyOf: - type: string - type: 'null' description: Resolved git commit SHA title: Resolved Ref source: description: Original source (e.g., 'github:owner/repo') title: Source type: string version: default: '' description: Canvas extension version title: Version type: string required: - name - source - installed_at - install_path title: InstalledCanvasExtensionResponse type: object HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' title: Detail type: array title: HTTPValidationError type: object CanvasExtensionManifest: description: Canvas extension manifest (``canvas-extension.json``). properties: backend: anyOf: - $ref: '#/components/schemas/CanvasExtensionBackend' - type: 'null' description: Optional explicitly prepared and started backend service contributes: $ref: '#/components/schemas/CanvasExtensionContributes' description: Contributions this extension makes to the Canvas UI description: default: '' description: Extension description title: Description type: string display_name: description: Human-readable extension name title: Display Name type: string entrypoint: description: >- Path, relative to the extension package root, to the bundle entry file title: Entrypoint type: string icon: anyOf: - type: string - type: 'null' description: Path, relative to the extension package root, to an SVG icon title: Icon name: description: Extension name (kebab-case) title: Name type: string schema_version: description: Manifest schema version title: Schema Version type: integer version: description: Extension version title: Version type: string required: - schema_version - name - display_name - version - entrypoint title: CanvasExtensionManifest type: object ValidationError: properties: ctx: title: Context type: object input: title: Input loc: items: anyOf: - type: string - type: integer title: Location type: array msg: title: Message type: string type: title: Error Type type: string required: - loc - msg - type title: ValidationError type: object CanvasExtensionBackend: description: Optional trusted backend declaration for schema-1 Canvas Apps. properties: argv: items: type: string minItems: 1 title: Argv type: array artifacts: additionalProperties: $ref: '#/components/schemas/CanvasExtensionBackendArtifact' minProperties: 1 propertyNames: enum: - linux-amd64 - linux-arm64 title: Artifacts type: object health: $ref: '#/components/schemas/CanvasExtensionBackendHealth' inherit_environment: items: type: string title: Inherit Environment type: array schema_version: const: 1 title: Schema Version type: integer required: - schema_version - artifacts - argv title: CanvasExtensionBackend type: object CanvasExtensionContributes: description: Contributions an extension makes to the Canvas UI. properties: pages: description: Pages contributed to Canvas navigation items: $ref: '#/components/schemas/CanvasExtensionPage' title: Pages type: array title: CanvasExtensionContributes type: object CanvasExtensionBackendArtifact: description: Immutable backend artifact for one supported platform. properties: path: description: Package-relative .tar.gz artifact path title: Path type: string sha256: description: Lowercase SHA-256 checksum pattern: ^[0-9a-f]{64}$ title: Sha256 type: string required: - path - sha256 title: CanvasExtensionBackendArtifact type: object CanvasExtensionBackendHealth: description: Loopback HTTP readiness probe for a backend process. properties: interval_seconds: default: 0.1 exclusiveMinimum: 0 maximum: 10 title: Interval Seconds type: number path: default: /health pattern: ^/[A-Za-z0-9._~!$&'()*+,;=:@%/-]*$ title: Path type: string timeout_seconds: default: 30 exclusiveMinimum: 0 maximum: 300 title: Timeout Seconds type: number title: CanvasExtensionBackendHealth type: object CanvasExtensionPage: description: A single page contributed to the Canvas UI by an extension. properties: id: description: Unique contribution id within the extension title: Id type: string path: description: Route the page is mounted at, e.g. '/dashboard' title: Path type: string title: description: Page title shown in Canvas navigation title: Title type: string required: - id - title - path title: CanvasExtensionPage type: object securitySchemes: APIKeyHeader: in: header name: X-Session-API-Key type: apiKey ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.