> ## 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 version > Reads only. Returns one of the decision's versions with its structure, in authored key order. `ref` is the version's structure hash or its number; the response always carries both. 404 STRUCTURE_UNKNOWN when no such version is registered for the decision. ## OpenAPI ````yaml /openapi.json get /v1/decisions/{decision_id}/versions/{ref} 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 import labeled 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/validate`. 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/validate` and `POST /v1/review/items/fill`, whose retry is another fill within the day's budget). 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}/versions/{ref}: get: tags: - decisions summary: Get a version description: >- Reads only. Returns one of the decision's versions with its structure, in authored key order. `ref` is the version's structure hash or its number; the response always carries both. 404 STRUCTURE_UNKNOWN when no such version is registered for the decision. operationId: getVersion parameters: - schema: $ref: '#/components/schemas/DecisionId' required: true description: >- A name you choose for this decision, such as `refund-exception`: a lowercase letter, then up to 127 of `a-z 0-9 _ . -`. Unique in your organization and shared by its test and production keys. The first registration or evaluation under a new one creates the decision. name: decision_id in: path - schema: type: string pattern: ^(?:sha256:[0-9a-f]{64}|[1-9][0-9]{0,8})$ description: >- The version's structure hash (`sha256:…`), or its number under the decision (`3`). example: '1' required: true description: >- The version's structure hash (`sha256:…`), or its number under the decision (`3`). name: ref in: path responses: '200': description: The version content: application/json: examples: version_1: summary: Version 1, read by its number (`/versions/1`) or its hash value: structure_hash: >- sha256:bdad6e5b1b879209305f1555b43ec62666a4d74a925280c66e54cc4dc07bb1ae number: 1 question_hashes: item_used: >- sha256:2cd936709034818c3beca2574ca48ef400577728a20532924ed68f1ca1f26e3d defective: >- sha256:8dd4a69d6bfaf9fa766adcac7cfa1c4af7eff57a690a1e39666398bf85cd1869 created_at: '2026-11-06T09:00:00.000Z' structure: questions: item_used: type: noul instructions: >- Has the customer used the item beyond trying it on or setting it up once? reads: - state.message defective: type: noul instructions: >- Does the customer describe a defect, damage on arrival, or the item failing under normal use? reads: - state.message attributes: days_since_delivery: type: number minimum: 0 aggregations: grant_score: type: weighted_mean inputs: - name: questions.item_used invert: true - name: questions.defective handling: type: rules rules: - when: name: attributes.days_since_delivery gt: 30 outcome: escalate - when: name: aggregations.grant_score gte: 0.72 outcome: grant - when: name: aggregations.grant_score lt: 0.38 outcome: deny else: escalate result: aggregations.handling schema: $ref: '#/components/schemas/DecisionVersionRead' '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) 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: $ref: '#/components/schemas/ErrorBody' security: - bearerAuth: - decisions:evaluate - bearerAuth: - decisions:develop components: schemas: DecisionId: type: string pattern: ^[a-z][a-z0-9_.-]{0,127}$ description: >- A name you choose for this decision, such as `refund-exception`: a lowercase letter, then up to 127 of `a-z 0-9 _ . -`. Unique in your organization and shared by its test and production keys. The first registration or evaluation under a new one creates the decision. DecisionVersionRead: type: object properties: structure_hash: $ref: '#/components/schemas/StructureHashOutput' number: $ref: '#/components/schemas/VersionNumber' 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. created_at: type: string format: date-time description: When the version was first registered. structure: type: object properties: questions: type: object additionalProperties: $ref: '#/components/schemas/QuestionOutput' description: System One questions, keyed by name. attributes: type: object additionalProperties: $ref: '#/components/schemas/AttributeOutput' description: >- Values your app supplies with each call in `attribute_values`. The model never sees them. aggregations: type: object additionalProperties: $ref: '#/components/schemas/AggregationOutput' 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: true description: The registered structure, in authored key order. x-moonbounce-sdk-known-fields: true required: - structure_hash - number - question_hashes - created_at - structure 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: $ref: '#/components/schemas/ErrorIssue' additionalProperties: {} required: - type - message additionalProperties: true x-moonbounce-sdk-known-fields: true required: - error additionalProperties: true x-moonbounce-sdk-known-fields: true StructureHashOutput: type: string pattern: ^sha256:[0-9a-f]{64}$ VersionNumber: type: integer minimum: 1 description: >- The version's number under its decision: 1 for the first structure registered, then 2, 3... in the order the organization registered them. For people; the hash is the version's identity. QuestionHash: type: string pattern: ^sha256:[0-9a-f]{64}$ QuestionOutput: oneOf: - $ref: '#/components/schemas/NoulQuestionOutput' discriminator: propertyName: type mapping: noul: '#/components/schemas/NoulQuestionOutput' AttributeOutput: oneOf: - $ref: '#/components/schemas/StringAttributeOutput' - $ref: '#/components/schemas/NumberAttributeOutput' - $ref: '#/components/schemas/BooleanAttributeOutput' discriminator: propertyName: type mapping: string: '#/components/schemas/StringAttributeOutput' number: '#/components/schemas/NumberAttributeOutput' boolean: '#/components/schemas/BooleanAttributeOutput' AggregationOutput: oneOf: - $ref: '#/components/schemas/WeightedMeanOutput' - $ref: '#/components/schemas/LogisticOutput' - $ref: '#/components/schemas/MinOutput' - $ref: '#/components/schemas/MaxOutput' - $ref: '#/components/schemas/ProductOutput' - $ref: '#/components/schemas/NoisyOrOutput' - $ref: '#/components/schemas/AllOutput' - $ref: '#/components/schemas/AnyOutput' - $ref: '#/components/schemas/BandsOutput' - $ref: '#/components/schemas/RulesOutput' - $ref: '#/components/schemas/MatchOutput' discriminator: propertyName: type mapping: weighted_mean: '#/components/schemas/WeightedMeanOutput' logistic: '#/components/schemas/LogisticOutput' min: '#/components/schemas/MinOutput' max: '#/components/schemas/MaxOutput' product: '#/components/schemas/ProductOutput' noisy_or: '#/components/schemas/NoisyOrOutput' all: '#/components/schemas/AllOutput' any: '#/components/schemas/AnyOutput' bands: '#/components/schemas/BandsOutput' rules: '#/components/schemas/RulesOutput' match: '#/components/schemas/MatchOutput' ErrorType: type: string enum: - invalid_request - authentication - permission_denied - not_found - conflict - rate_limited - engine_failed - unavailable - internal ErrorIssue: type: object properties: param: type: string code: type: string pattern: ^[A-Z][A-Z0-9_]+$ 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 NoulQuestionOutput: type: object properties: type: type: string enum: - noul instructions: $ref: '#/components/schemas/InstructionsOutput' criteria: type: object properties: 'true': type: string minLength: 1 maxLength: 4000 'false': type: string minLength: 1 maxLength: 4000 additionalProperties: true x-moonbounce-sdk-known-fields: true reads: type: array items: $ref: '#/components/schemas/StatePathOutput' 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: true description: P(true) for a statement about the state. x-moonbounce-sdk-known-fields: true StringAttributeOutput: 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: true x-moonbounce-sdk-known-fields: true NumberAttributeOutput: 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: true x-moonbounce-sdk-known-fields: true BooleanAttributeOutput: 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: true x-moonbounce-sdk-known-fields: true WeightedMeanOutput: type: object properties: type: type: string enum: - weighted_mean inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' weight: type: number exclusiveMinimum: 0 invert: type: boolean required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: 'Σ wᵢ·xᵢ / Σ wᵢ: a weighted average from 0 to 1, not a probability.' x-moonbounce-sdk-known-fields: true LogisticOutput: type: object properties: type: type: string enum: - logistic bias: type: number inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' weight: type: number required: - name - weight additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - bias - inputs additionalProperties: true description: σ(bias + Σ wᵢ·xᵢ), with signed weights on raw input values. x-moonbounce-sdk-known-fields: true MinOutput: type: object properties: type: type: string enum: - min inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' invert: type: boolean required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: 'min xᵢ: all of these, when they overlap.' x-moonbounce-sdk-known-fields: true MaxOutput: type: object properties: type: type: string enum: - max inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' invert: type: boolean required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: 'max xᵢ: any of these, when they overlap.' x-moonbounce-sdk-known-fields: true ProductOutput: type: object properties: type: type: string enum: - product inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' invert: type: boolean required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: 'Π xᵢ: all of these, when they are independent.' x-moonbounce-sdk-known-fields: true NoisyOrOutput: type: object properties: type: type: string enum: - noisy_or inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' invert: type: boolean required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: '1 − Π(1 − xᵢ): any of these, when they are independent.' x-moonbounce-sdk-known-fields: true AllOutput: type: object properties: type: type: string enum: - all inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' gte: type: number gt: type: number lte: type: number lt: type: number required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: 1 when every input passes its threshold (default ≥ 0.5), else 0. x-moonbounce-sdk-known-fields: true AnyOutput: type: object properties: type: type: string enum: - any inputs: type: array items: type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' gte: type: number gt: type: number lte: type: number lt: type: number required: - name additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 required: - type - inputs additionalProperties: true description: 1 when any input passes its threshold (default ≥ 0.5), else 0. x-moonbounce-sdk-known-fields: true BandsOutput: type: object properties: type: type: string enum: - bands input: $ref: '#/components/schemas/FeatureRefOutput' below: $ref: '#/components/schemas/NameOutput' cuts: type: array items: type: object properties: at: type: number outcome: $ref: '#/components/schemas/NameOutput' required: - at - outcome additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 9 abstain: $ref: '#/components/schemas/NameOutput' required: - type - input - below - cuts additionalProperties: true description: >- Names an outcome for each range of one feature's value. `at` means ≥; `below` is under the first cut. x-moonbounce-sdk-known-fields: true RulesOutput: type: object properties: type: type: string enum: - rules rules: type: array items: type: object properties: when: $ref: '#/components/schemas/ConditionOutput' outcome: $ref: '#/components/schemas/NameOutput' required: - when - outcome additionalProperties: true x-moonbounce-sdk-known-fields: true minItems: 1 maxItems: 64 else: $ref: '#/components/schemas/NameOutput' required: - type - rules - else additionalProperties: true description: >- The first rule whose condition is true names its `outcome`; otherwise `else`. x-moonbounce-sdk-known-fields: true MatchOutput: type: object properties: type: type: string enum: - match input: $ref: '#/components/schemas/FeatureRefOutput' cases: type: object additionalProperties: $ref: '#/components/schemas/NameOutput' 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/NameOutput' abstain: $ref: '#/components/schemas/NameOutput' required: - type - input - cases additionalProperties: true description: Maps a label straight to an outcome. x-moonbounce-sdk-known-fields: true InstructionsOutput: anyOf: - type: string minLength: 1 maxLength: 4000 - type: object additionalProperties: {} - type: array items: {} minItems: 1 StatePathOutput: type: string minLength: 1 maxLength: 256 description: >- `state.` or a nested object path such as `state.order.customer.tier`: keys of an object `state`. A key has no `.`, `[` or `]`. Array indexes are not supported yet. examples: - state.message - state.order.order_total_usd FeatureRefOutput: type: string minLength: 1 maxLength: 80 description: >- A feature's path: `questions.`, `attributes.` or `aggregations.`. examples: - questions.asks_for_refund - aggregations.band NameOutput: type: string pattern: ^[a-z][a-z0-9_]{0,63}$ ConditionOutput: anyOf: - type: object properties: name: $ref: '#/components/schemas/FeatureRefOutput' 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: true x-moonbounce-sdk-known-fields: true - type: object properties: all: type: array items: $ref: '#/components/schemas/ConditionOutput' minItems: 1 maxItems: 64 required: - all additionalProperties: true x-moonbounce-sdk-known-fields: true - type: object properties: any: type: array items: $ref: '#/components/schemas/ConditionOutput' minItems: 1 maxItems: 64 required: - any additionalProperties: true x-moonbounce-sdk-known-fields: true - type: object properties: not: $ref: '#/components/schemas/ConditionOutput' required: - not additionalProperties: true x-moonbounce-sdk-known-fields: true 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.