instructor_dart 0.6.0

instructor_dart: ^0.6.0 copied to clipboard

Two pre-1.0.0 decisions, both about what the API promises rather than what it computes. Breaking for anyone who wrote their own adapter; the migration is one word.

• LlmAdapter is now an abstract base class with a close() default, and Instructor has a close() that forwards to it. Two problems met here. An adapter constructed without an http.Client creates one and owns it, and the shape the README leads with passes the adapter inline and never keeps a reference — so nothing could reach that client, and a program following the README sat on an idle socket after its work was done. close() existed only on the three concrete adapters, not on the type callers hold. The second problem is that fixing this by adding a member to an abstract interface class breaks every third-party implementer, and the roadmap has streaming on it, which would break them a second time. A base class with concrete defaults can grow without breaking anyone, so that is what it is now.

  To migrate, change implements LlmAdapter to extends LlmAdapter and mark your class base, final or sealed. Override close() only if your adapter owns something.

• Corrected the integer claim in the README. It said json['age'] as int is always safe for an integer field. It is not, above 2^53: validate accepts such a value, but normalize deliberately leaves it a double rather than converting lossily, so the cast throws. Measured: 1e16, 1e17 and 1e300 all validate and all throw on as int. The README now says so and suggests reading such a field as num, or modelling it as a string.

The last things to settle before this can freeze at 1.0.0, all found by re-reviewing the public surface against what a permanent contract would fix.

• Stop Schema.object aliasing the caller's map. It stored the exact map passed in, so Schema.object(props) followed by props['x'] = ... changed the schema afterwards, and schema.properties was itself writable, both bypassing every check the factory does and changing what validate demands. This is the same escape hatch 0.4.0 closed for the constructors, left open in one more place. Schema.object now copies into an unmodifiable map, matching what Schema.enumeration already documents and does for its list. Breaking only for code that mutated a schema through that aliasing, which was never intended to work.
• Make collectViolations private. It was public with a note that it had to be, "so that schema types can recurse into each other". That was not true: Schema is sealed and every schema type lives in the one library, so the recursion works with it private, and Dart privacy is per-library. Public, it froze an internal accumulator hook, its out-parameter list and its seed-the-path convention, into the 1.0.0 contract. validate is the supported entry point and is unchanged.
• Give SchemaViolation and Message value equality. Both are small immutable value types that callers naturally compare and put in sets: deduplicating the violations across ExtractionException.attempts, or asserting on LlmRequest.messages in an adapter test. Message was worse than missing equality, it was inconsistent: two const identical messages compared equal through canonicalization while two runtime-built identical ones did not. Both now compare by value. Adding this after 1.0.0 would silently change how existing sets and maps of these types dedup, so it lands now.

• Make the concrete schema constructors library-private so the validating Schema.* factories are the only way to build a schema. Breaking change: StringSchema(...), IntegerSchema(...), NumberSchema(...), BooleanSchema(...), EnumSchema(...), ListSchema(...) and ObjectSchema(...) can no longer be called directly; use Schema.string, Schema.integer, Schema.number, Schema.boolean, Schema.enumeration, Schema.list and Schema.object instead. The concrete types stay exported for use in return types, switch, and field access, and .optional() still returns the same concrete type. This closes a construction path that skipped the factory checks: Schema.string rejects an invalid regular expression and Schema.enumeration rejects an empty list and copies its values, and a direct constructor call bypassed both.

• Fix .optional() rejecting an explicit JSON null on the property it was applied to. .optional() only removed the key from the JSON Schema required list, so a key present with value null still fell through to the leaf schema's type check and failed as a type mismatch instead of being treated as absent. Forced tool calling on OpenAI, Anthropic and Gemini regularly fills in every declared parameter and represents "no value" as null rather than omitting the key, so this broke .optional() for exactly the case it exists for. A required property given null is still reported as a violation.

• Normalize numeric fields to the Dart type their schema promises instead of coercing every integral double to int. A number field given a whole value like 42 now decodes to a double (42.0), so json['price'] as double in fromJson no longer throws after validation reported success; an integer field still arrives as int. Adds Schema.normalize, called after validation to do this per node type.

• Shorten the screenshot description. pub.dev accepts up to 200 characters but scores only those under 160, so the previous release published cleanly and quietly gave up the documentation points it was meant to earn.

• Declare the diagram in pubspec.yaml so pub.dev renders it on the package page. It was already in the repository and the README, but pub.dev shows only what the screenshots: field points at.

• Shorten the pub.dev description back under the 180-character limit. The previous release grew it past that, which costs the "valid pubspec" points and truncates the text search engines show.

• Add GeminiAdapter for the Gemini API's generateContent, completing the three major providers. The schema is sent as a function declaration and forced with functionCallingConfig.mode: "ANY". Two Gemini-specific shapes are handled: contents only accepts the user and model roles, so an assistant message is sent as model, and system text goes in the top-level systemInstruction rather than being a message. The API key is sent in the x-goog-api-key header instead of the key query parameter, so it stays out of URLs and logs.

• Docs: tightened the README wording and visuals.

• Expand the package description to name what the package does in the words people search for. No code changes.

Initial release.

• Plain-Dart schema builder rendering to JSON Schema: objects, strings, integers, numbers, booleans, enums, lists, nesting, optional properties, length/range/pattern constraints.
• Local validation with JSONPath-style violation reporting.
• Instructor.extract / extractRaw with an automatic repair loop that feeds validation errors back to the model.
• OpenAIAdapter for OpenAI and OpenAI-compatible servers (Ollama, LM Studio, vLLM, OpenRouter), using forced tool calls.
• AnthropicAdapter for the Anthropic Messages API, using forced tool use.
• ExtractionException with full attempt history.