> ## 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. # Register a spec structure > Stores a spec's structure under the decision so evaluations can name it by hash. Idempotent by content: 201 when this call registered it, 200 when it already existed. The first registration for an environment also creates the decision's engine binding there from the deployment default. Returns hashes and metadata without the spec; getStructure reads the spec. ## OpenAPI ````yaml /openapi.json post /v1/decisions/{decision_id}/structures 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, counted per Cloudflare location. servers: - url: https://api.moonbounce.ai description: Production security: [] paths: /v1/decisions/{decision_id}/structures: post: tags: - specs summary: Register a spec structure description: >- Stores a spec's structure under the decision so evaluations can name it by hash. Idempotent by content: 201 when this call registered it, 200 when it already existed. The first registration for an environment also creates the decision's engine binding there from the deployment default. Returns hashes and metadata without the spec; getStructure reads the spec. operationId: registerStructure parameters: - schema: $ref: '#/components/schemas/DecisionId' required: true name: decision_id in: path - schema: type: string minLength: 1 maxLength: 255 pattern: ^[\x20-\x7e]+$ description: >- Makes a retry safe. For 24 hours, the same key with the same request returns the first stored result (with Idempotent-Replayed: true); the same key with a different request is a 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 with its key. required: false description: >- Makes a retry safe. For 24 hours, the same key with the same request returns the first stored result (with Idempotent-Replayed: true); the same key with a different request is a 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 with its key. name: idempotency-key in: header requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/StructureRegistration' responses: '200': description: Already registered headers: Idempotent-Replayed: schema: type: string enum: - 'true' description: >- Present and `true` when this is the stored result of an earlier request with the same Idempotency-Key. required: false description: >- Present and `true` when this is the stored result of an earlier request with the same Idempotency-Key. content: application/json: schema: $ref: '#/components/schemas/StructureRecord' '201': description: Registered headers: Idempotent-Replayed: schema: type: string enum: - 'true' description: >- Present and `true` when this is the stored result of an earlier request with the same Idempotency-Key. required: false description: >- Present and `true` when this is the stored result of an earlier request with the same Idempotency-Key. content: application/json: schema: $ref: '#/components/schemas/StructureRecord' '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' '410': description: >- The Idempotency-Key's first result was deleted, so it cannot be replayed content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '422': description: >- The request is well formed but cannot be processed (for example reason IDEMPOTENCY_KEY_REUSED) 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: $ref: '#/components/schemas/ErrorBody' security: - bearerAuth: - decisions:develop components: schemas: DecisionId: type: string pattern: ^[a-z][a-z0-9_.-]{0,127}$ StructureRegistration: type: object properties: spec: $ref: '#/components/schemas/Spec' required: - spec additionalProperties: false StructureRecord: 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 required: - environment - decision_id - structure - nodes - default_weights - first_seen_at - created 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 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: $ref: '#/components/schemas/Meta' required: - format - nodes - output additionalProperties: false Environment: type: string enum: - production - test description: >- The environment of the key that made the call: `production` or `test`. Evaluations, feedback, reviews and suggestions are separate per environment; registered structures are shared. VersionHash: type: string pattern: ^sha256:[0-9a-f]{64}$ 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 ErrorType: type: string enum: - invalid_request - authentication - permission_denied - not_found - conflict - rate_limited - engine_failed - unavailable - internal SpecNode: oneOf: - $ref: '#/components/schemas/BooleanFeature' - $ref: '#/components/schemas/Combine' - $ref: '#/components/schemas/Calibrate' discriminator: propertyName: type mapping: boolean: '#/components/schemas/BooleanFeature' combine: '#/components/schemas/Combine' calibrate: '#/components/schemas/Calibrate' Name: type: string pattern: ^[a-z][a-z0-9_]{0,63}$ 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.