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Builtins catalog / nika:validate

Data

Tool family from the canonical registry.

invoke

Call this builtin through the invoke verb.

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Read this contract

This reference preserves the specification at the revision linked below. Source examples are fragments: their surrounding tasks, inputs and permissions are not supplied here. Consult engine status and nika catalog --tools --json for the installed implementation; a registry declaration is not a runtime qualification.

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Usage and behavior

illustration
Validate data against a JSON Schema · returns { valid: bool, errors: [...] }. Invalid DATA is a report, never a task failure (gate on .valid downstream · or nika:assert it). Merges the former json_verify + yaml_validate (format: arg · one validator). schema: may be an object or a JSON/YAML string (a nika:read of a .json file is a string — the builtin parses it). Throws · NIKA-BUILTIN-VALIDATE-001 (the schema: itself is not a valid JSON Schema · validation_error) · -002 (format: yaml and the string does not parse as YAML).

Arguments

Pass the values required by the tool contract.

Permissions

Understand authority before granting effects.

Errors and recovery

Read diagnostics and choose a recovery policy.

Workflow templates

Put the fragment inside a complete workflow.

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Contract provenance

Read the pinned specification · Canonical registry. Tool identity: nika:validate. Specification revision: f8c5df2127c7. The Lab language identity is language:tool:validate; the registry view is ecosystem:tool/nika:validate. They refer to this contract without merging their graph identities.