> ## Documentation Index > Fetch the complete documentation index at: https://docs.moonbounce.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get a registered structure and its spec > Reads only. Returns the authored spec, hashes and `meta` of a registered structure (404 VERSION_UNKNOWN otherwise). Older stored specs use the current vocabulary; rows predating authored-order storage may have a different node order. ## OpenAPI ````yaml /openapi.json get /v1/decisions/{decision_id}/structures/{structure} openapi: 3.1.0 info: title: Moonbounce Decisions API version: 0.0.0 description: >- Moonbounce decisions: evaluate items against a decision spec (features combined by aggregators), record feedback and seed examples, review a ranked queue, and improve the spec through suggestions that ship as code diffs, each with a preview (backtest) and an evidence label. **Authentication.** Send an API key as `Authorization: Bearer ` on every operation except `GET /health` and `POST /v1/specs/hash`. Call the API from a server, never a browser: a key must not reach one, and the API sends no CORS headers. A key belongs to one organization and one environment: production, or test for a key with the `env:test` permission. Test traffic never counts as production traffic. **Requests.** JSON bodies (`Content-Type: application/json`) of at most 1 MB, parsed strictly: duplicate keys, lone surrogates, integers outside ±(2^53 - 1), `__proto__` keys, U+0000 and nesting deeper than 64 are a 400. **Retries.** Send an `Idempotency-Key` on every POST under /v1 that takes one (all but `POST /v1/specs/hash`). Keep it for the request's retries. The same key with the same request returns the first stored result, marked `Idempotent-Replayed: true`, for 24 hours (410 if that result was since deleted); with another request it is 422 IDEMPOTENCY_KEY_REUSED. Keys are scoped to the organization and environment across every operation, so use a fresh key per request. A request that failed before its result was stored runs again when retried. 429 and 503 under /v1 may carry `Retry-After` (seconds); a daily QUOTA_EXCEEDED cap instead names its reset time. **Errors.** Every error under /v1 is `{"error": {"type", "message", "reason"?, "param"?, "details"?}}` (ErrorBody); `GET /health` answers its own shape. Every response carries a `Request-Id` header. Rate limits apply per key, and per client IP for requests without a valid key; a 429 RATE_LIMITED carries `Retry-After`. servers: - url: https://api.moonbounce.ai description: Production security: [] paths: /v1/decisions/{decision_id}/structures/{structure}: get: tags: - specs summary: Get a registered structure and its spec description: >- Reads only. Returns the authored spec, hashes and `meta` of a registered structure (404 VERSION_UNKNOWN otherwise). Older stored specs use the current vocabulary; rows predating authored-order storage may have a different node order. operationId: getStructure parameters: - schema: $ref: '#/components/schemas/DecisionId' required: true name: decision_id in: path - schema: $ref: '#/components/schemas/VersionHash' required: true name: structure in: path responses: '200': description: The registered structure content: application/json: schema: $ref: '#/components/schemas/StructureRead' '400': description: 'Invalid request: `param` names the field at fault when one applies' content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '401': description: Missing or invalid API key (reason KEY_INVALID) content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '403': description: The key may not do this content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '404': description: Not found, or not in this key's organization and environment content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '429': description: >- RATE_LIMITED: retry after Retry-After seconds; QUOTA_EXCEEDED: details.reset_at gives the daily reset time (no Retry-After), or details.too_large asks for a smaller request headers: Retry-After: schema: type: string description: Seconds to wait before retrying, when waiting helps. required: false description: Seconds to wait before retrying, when waiting helps. content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '503': description: >- Temporarily unavailable, with Retry-After (for example reason AUTH_UNAVAILABLE, ENGINE_UNAVAILABLE or STORE_UNAVAILABLE): retry with the same Idempotency-Key headers: Retry-After: schema: type: string description: Seconds to wait before retrying, when waiting helps. required: true description: Seconds to wait before retrying, when waiting helps. content: application/json: schema: $ref: '#/components/schemas/ErrorBody' security: - bearerAuth: - decisions:evaluate - bearerAuth: - decisions:develop components: schemas: DecisionId: type: string pattern: ^[a-z][a-z0-9_.-]{0,127}$ VersionHash: type: string pattern: ^sha256:[0-9a-f]{64}$ StructureRead: type: object properties: environment: $ref: '#/components/schemas/Environment' decision_id: $ref: '#/components/schemas/DecisionId' structure: $ref: '#/components/schemas/VersionHash' nodes: type: object additionalProperties: $ref: '#/components/schemas/VersionHash' description: >- Each of the spec's nodes, by name, mapped to that node's hash (not its definition). A feature's hash is what feedback about it is stored against. default_weights: $ref: '#/components/schemas/VersionHash' first_seen_at: $ref: '#/components/schemas/Timestamp' meta: $ref: '#/components/schemas/Meta' created: type: boolean spec: type: object properties: format: type: string enum: - moonbounce.spec/0 guidance: type: string minLength: 1 maxLength: 20000 nodes: type: object additionalProperties: $ref: '#/components/schemas/SpecNode' description: >- The spec's named nodes, 1 to 64: boolean features and the aggregators that read them. Every reference (`output`, a combine term's `node`, a calibrate's `node`) names a node in this map, with no cycles. output: $ref: '#/components/schemas/Name' target: type: string minLength: 1 maxLength: 4000 description: >- The yes/no statement the output's score is the probability of. Required when `output` is a combine or calibrate node, optional on a boolean output. Feedback `target` claims need it. meta: $ref: '#/components/schemas/Meta' required: - format - nodes - output additionalProperties: false description: >- The first registered spec, in authored node order and the current vocabulary. required: - environment - decision_id - structure - nodes - default_weights - first_seen_at - created - spec additionalProperties: false ErrorBody: type: object properties: error: type: object properties: type: $ref: '#/components/schemas/ErrorType' reason: type: string pattern: ^[A-Z][A-Z0-9_]+$ description: >- Set where a caller can act on it, one of the reasons in the ErrorReason schema. New reasons may be added: treat an unknown one by the status and `type`. message: type: string description: For people; don't parse it. param: type: string description: >- The request field at fault, as a dotted path (`subject.0.text`, `claims.1.value`). details: type: object additionalProperties: {} required: - type - message additionalProperties: false required: - error additionalProperties: false Environment: type: string enum: - production - test description: >- The environment of the key that made the call: `production` or `test`. Evaluations, feedback, reviews and suggestions are separate per environment; registered structures are shared. Timestamp: type: string format: date-time Meta: type: object properties: title: type: string maxLength: 200 description: type: string maxLength: 4000 owner: type: string maxLength: 200 tags: type: array items: type: string maxLength: 64 maxItems: 32 display: type: object additionalProperties: type: object properties: text: type: string minLength: 1 maxLength: 40 help: type: string maxLength: 200 required: - text additionalProperties: false additionalProperties: false SpecNode: oneOf: - $ref: '#/components/schemas/BooleanFeature' - $ref: '#/components/schemas/Combine' - $ref: '#/components/schemas/Calibrate' discriminator: propertyName: type mapping: boolean: '#/components/schemas/BooleanFeature' combine: '#/components/schemas/Combine' calibrate: '#/components/schemas/Calibrate' Name: type: string pattern: ^[a-z][a-z0-9_]{0,63}$ ErrorType: type: string enum: - invalid_request - authentication - permission_denied - not_found - conflict - rate_limited - engine_failed - unavailable - internal BooleanFeature: type: object properties: type: type: string enum: - boolean prompt: type: string minLength: 1 maxLength: 4000 guidance: type: string minLength: 1 maxLength: 4000 inputs: type: array items: $ref: '#/components/schemas/Name' minItems: 1 description: >- Names of the `subject` parts this feature reads (default: all of them); `context` parts are always read. Every name must match a subject part's `name`, or the request is a 400 CONTENT_INVALID. criteria: type: object properties: 'true': type: string minLength: 1 maxLength: 4000 'false': type: string minLength: 1 maxLength: 4000 additionalProperties: false required: - type - prompt additionalProperties: false Combine: type: object properties: type: type: string enum: - combine terms: type: array items: $ref: '#/components/schemas/CombineTerm' minItems: 1 maxItems: 64 prior: type: string enum: - mean - any description: >- Default combine weights before fitting. mean averages oriented inputs; any computes sigmoid(-4 + 8·Σraises - 8·Σlowers), a logistic of a signed sum: one strong raise is enough and weak raises add up. fixed: type: object properties: link: type: string enum: - identity - logistic description: >- identity: the weighted sum plus bias, clipped to 0..1; logistic: the sigmoid of the weighted sum plus bias. weights: type: object additionalProperties: type: number description: Signed weights per term key (node; options are reserved). bias: type: number description: Offset added to the weighted sum before applying the link. required: - link - weights - bias additionalProperties: false description: >- Numbers fixed in code, never overridden by fitted weights. Signed weights multiply raw P(yes): raises weights must be >= 0 and lowers weights <= 0. required: - type - terms additionalProperties: false description: >- Scores a node from its terms. Before fitting (and without fixed numbers), mean averages the oriented inputs, so each of n terms weighs 1/n and adding a term dilutes the others; any computes sigmoid(-4 + 8·Σraises - 8·Σlowers): one strong raise is enough, weak raises add up, and lowers cancel raises. Fitted or fixed numbers replace the prior. Calibrate: type: object properties: type: type: string enum: - calibrate node: $ref: '#/components/schemas/Name' required: - type - node additionalProperties: false CombineTerm: type: object properties: node: $ref: '#/components/schemas/Name' option: type: string pattern: ^[a-z][a-z0-9_]{0,63}$ description: >- Reserved for choice and scale features, which are not available yet: any value is a 400. effect: type: string enum: - raises - lowers default: raises description: >- raises: a yes pushes the score up; lowers: a yes pushes it down. The sign lives here; fixed weights must agree with it. required: - node additionalProperties: false securitySchemes: bearerAuth: type: http scheme: bearer description: >- An API key, sent as `Authorization: Bearer `. Each operation lists the scope its key needs: `decisions:evaluate` (evaluate and read evaluations), `decisions:feedback` (your app's feedback) or `decisions:develop` (everything else, including owner feedback and the review queue). An operation listing no scope takes any scoped key. A key with no scope, or without the operation's, gets 403 INSUFFICIENT_SCOPE. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.