> ## 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 decision structure > Stores a structure under the decision so evaluations can name it in `moonbounce.structure_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 without the structure; getStructure reads it. ## 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 an item's state against a decision structure (System One questions, attributes you supply and aggregations over both), record feedback and seed examples, review a ranked queue, and improve the structure 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/structures/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/structures/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: post: tags: - structures summary: Register a decision structure description: >- Stores a structure under the decision so evaluations can name it in `moonbounce.structure_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 without the structure; getStructure reads it. 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/DecisionStructure' 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' '413': description: The HTTP body exceeds 1 MB (reason BODY_TOO_LARGE) content: application/json: schema: $ref: '#/components/schemas/ErrorBody' '422': description: >- The request is well formed but cannot be processed (IDEMPOTENCY_KEY_REUSED requires a fresh key; REQUEST_TOO_LARGE requires a smaller request) 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) 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: $ref: '#/components/schemas/ErrorBody' security: - bearerAuth: - decisions:develop components: schemas: DecisionId: type: string pattern: ^[a-z][a-z0-9_.-]{0,127}$ DecisionStructure: type: object properties: questions: type: object additionalProperties: $ref: '#/components/schemas/Question' description: System One questions, keyed by name. attributes: type: object additionalProperties: $ref: '#/components/schemas/Attribute' description: >- Values your app supplies with each call in `attribute_values`. The model never sees them. aggregations: type: object additionalProperties: $ref: '#/components/schemas/Aggregation' result: type: string minLength: 1 maxLength: 80 description: The final feature's path, such as `aggregations.band`. examples: - questions.asks_for_refund - aggregations.band required: - questions - result additionalProperties: false description: >- Everything that defines a decision: questions, attribute declarations, aggregations and the result. Names are unique across all three maps. StructureRecord: type: object properties: environment: $ref: '#/components/schemas/Environment' decision_id: $ref: '#/components/schemas/DecisionIdOutput' structure_hash: $ref: '#/components/schemas/StructureHashOutput' question_hashes: type: object additionalProperties: $ref: '#/components/schemas/QuestionHash' description: >- Each question, by name, mapped to its hash (its definition without its name). A question's hash is what feedback about it is stored against. first_seen_at: $ref: '#/components/schemas/Timestamp' created: type: boolean required: - environment - decision_id - structure_hash - question_hashes - first_seen_at - created additionalProperties: true x-moonbounce-sdk-known-fields: true 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 (`attribute_values.region`, `claims.1.value`). details: type: object properties: issues: type: array items: $ref: '#/components/schemas/ErrorIssue' additionalProperties: {} required: - type - message additionalProperties: true x-moonbounce-sdk-known-fields: true required: - error additionalProperties: true x-moonbounce-sdk-known-fields: true Question: oneOf: - $ref: '#/components/schemas/NoulQuestion' discriminator: propertyName: type mapping: noul: '#/components/schemas/NoulQuestion' Attribute: oneOf: - $ref: '#/components/schemas/StringAttribute' - $ref: '#/components/schemas/NumberAttribute' - $ref: '#/components/schemas/BooleanAttribute' discriminator: propertyName: type mapping: string: '#/components/schemas/StringAttribute' number: '#/components/schemas/NumberAttribute' boolean: '#/components/schemas/BooleanAttribute' Aggregation: oneOf: - $ref: '#/components/schemas/WeightedMean' - $ref: '#/components/schemas/Logistic' - $ref: '#/components/schemas/Min' - $ref: '#/components/schemas/Max' - $ref: '#/components/schemas/Product' - $ref: '#/components/schemas/NoisyOr' - $ref: '#/components/schemas/All' - $ref: '#/components/schemas/Any' - $ref: '#/components/schemas/Bands' - $ref: '#/components/schemas/Rules' - $ref: '#/components/schemas/Match' discriminator: propertyName: type mapping: weighted_mean: '#/components/schemas/WeightedMean' logistic: '#/components/schemas/Logistic' min: '#/components/schemas/Min' max: '#/components/schemas/Max' product: '#/components/schemas/Product' noisy_or: '#/components/schemas/NoisyOr' all: '#/components/schemas/All' any: '#/components/schemas/Any' bands: '#/components/schemas/Bands' rules: '#/components/schemas/Rules' match: '#/components/schemas/Match' Environment: type: string enum: - production - test description: >- The environment of the key that made the call: `production` or `test`. Evaluations, feedback, reviews and suggestions are separate per environment; registered structures are shared. DecisionIdOutput: type: string pattern: ^[a-z][a-z0-9_.-]{0,127}$ StructureHashOutput: type: string pattern: ^sha256:[0-9a-f]{64}$ QuestionHash: type: string pattern: ^sha256:[0-9a-f]{64}$ Timestamp: type: string format: date-time ErrorType: type: string enum: - invalid_request - authentication - permission_denied - not_found - conflict - rate_limited - engine_failed - unavailable - internal ErrorIssue: type: object properties: param: type: string code: type: string pattern: ^[A-Z][A-Z0-9_]+$ description: >- Stable, extensible issue code; unknown codes still have a parameter and human-readable message. message: type: string required: - param - code - message additionalProperties: true x-moonbounce-sdk-known-fields: true NoulQuestion: type: object properties: type: type: string enum: - noul instructions: $ref: '#/components/schemas/Instructions' criteria: type: object properties: 'true': type: string minLength: 1 maxLength: 4000 'false': type: string minLength: 1 maxLength: 4000 additionalProperties: false reads: type: array items: $ref: '#/components/schemas/StatePath' minItems: 1 maxItems: 64 description: >- Paths into an object `state` this question reads, such as `state.message` or `state.order.customer.tier`. The question sees just those values, nested as in the state. Without it the question sees the whole state, as in System One. Every path must exist in the call's `state`; no entry may repeat or contain another. required: - type - instructions additionalProperties: false description: P(true) for a statement about the state. StringAttribute: type: object properties: type: type: string enum: - string enum: type: array items: type: string minLength: 1 maxLength: 200 minItems: 1 maxItems: 255 default: type: string source: type: string minLength: 1 maxLength: 200 description: >- The model and version behind this attribute, such as `toxicity-classifier-v3`. Hashed. required: - type - enum additionalProperties: false NumberAttribute: type: object properties: type: type: string enum: - number minimum: type: number maximum: type: number default: type: number source: type: string minLength: 1 maxLength: 200 description: >- The model and version behind this attribute, such as `toxicity-classifier-v3`. Hashed. required: - type additionalProperties: false BooleanAttribute: type: object properties: type: type: string enum: - boolean default: type: boolean source: type: string minLength: 1 maxLength: 200 description: >- The model and version behind this attribute, such as `toxicity-classifier-v3`. Hashed. required: - type additionalProperties: false WeightedMean: type: object properties: type: type: string enum: - weighted_mean inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' weight: type: number exclusiveMinimum: 0 invert: type: boolean required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: 'Σ wᵢ·xᵢ / Σ wᵢ: a weighted average from 0 to 1, not a probability.' Logistic: type: object properties: type: type: string enum: - logistic bias: type: number inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' weight: type: number required: - name - weight additionalProperties: false minItems: 1 maxItems: 64 required: - type - bias - inputs additionalProperties: false description: σ(bias + Σ wᵢ·xᵢ), with signed weights on raw input values. Min: type: object properties: type: type: string enum: - min inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' invert: type: boolean required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: 'min xᵢ: all of these, when they overlap.' Max: type: object properties: type: type: string enum: - max inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' invert: type: boolean required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: 'max xᵢ: any of these, when they overlap.' Product: type: object properties: type: type: string enum: - product inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' invert: type: boolean required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: 'Π xᵢ: all of these, when they are independent.' NoisyOr: type: object properties: type: type: string enum: - noisy_or inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' invert: type: boolean required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: '1 − Π(1 − xᵢ): any of these, when they are independent.' All: type: object properties: type: type: string enum: - all inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' gte: type: number gt: type: number lte: type: number lt: type: number required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: 1 when every input passes its threshold (default ≥ 0.5), else 0. Any: type: object properties: type: type: string enum: - any inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRef' gte: type: number gt: type: number lte: type: number lt: type: number required: - name additionalProperties: false minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: false description: 1 when any input passes its threshold (default ≥ 0.5), else 0. Bands: type: object properties: type: type: string enum: - bands input: $ref: '#/components/schemas/FeatureRef' below: $ref: '#/components/schemas/Name' cuts: type: array items: type: object properties: at: type: number outcome: $ref: '#/components/schemas/Name' required: - at - outcome additionalProperties: false minItems: 1 maxItems: 9 abstain: $ref: '#/components/schemas/Name' required: - type - input - below - cuts additionalProperties: false description: >- Names an outcome for each range of one feature's value. `at` means ≥; `below` is under the first cut. Rules: type: object properties: type: type: string enum: - rules rules: type: array items: type: object properties: when: $ref: '#/components/schemas/Condition' outcome: $ref: '#/components/schemas/Name' required: - when - outcome additionalProperties: false minItems: 1 maxItems: 64 else: $ref: '#/components/schemas/Name' required: - type - rules - else additionalProperties: false description: >- The first rule whose condition is true names its `outcome`; otherwise `else`. Match: type: object properties: type: type: string enum: - match input: $ref: '#/components/schemas/FeatureRef' cases: type: object additionalProperties: $ref: '#/components/schemas/Name' description: >- Maps labels to outcomes. "__proto__" is not supported as a case key; use a rules is-condition for that label. else: $ref: '#/components/schemas/Name' abstain: $ref: '#/components/schemas/Name' required: - type - input - cases additionalProperties: false description: Maps a label straight to an outcome. Instructions: anyOf: - type: string minLength: 1 maxLength: 4000 - type: object additionalProperties: {} - type: array items: {} minItems: 1 StatePath: type: string minLength: 1 maxLength: 256 description: >- `state.` or a nested object path such as `state.order.customer.tier`: keys of an object `state`. A key has no `.`, `[` or `]`. Array indexes are not supported yet. examples: - state.message - state.order.order_total_usd FeatureRef: type: string minLength: 1 maxLength: 80 description: >- A feature's path: `questions.`, `attributes.` or `aggregations.`. examples: - questions.asks_for_refund - aggregations.band Name: type: string pattern: ^[a-z][a-z0-9_]{0,63}$ Condition: anyOf: - type: object properties: name: $ref: '#/components/schemas/FeatureRef' gte: type: number gt: type: number lte: type: number lt: type: number is: type: string minLength: 1 maxLength: 200 in: type: array items: type: string minLength: 1 maxLength: 200 minItems: 1 maxItems: 255 abstained: type: boolean enum: - true required: - name additionalProperties: false - type: object properties: all: type: array items: $ref: '#/components/schemas/Condition' minItems: 1 maxItems: 64 required: - all additionalProperties: false - type: object properties: any: type: array items: $ref: '#/components/schemas/Condition' minItems: 1 maxItems: 64 required: - any additionalProperties: false - type: object properties: not: $ref: '#/components/schemas/Condition' required: - not 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.