langchain_core 0.5.0

Contains core abstractions of LangChain.dart and the LangChain Expression Language (LCEL).

0.5.0

Breaking: AI messages now use ordered content blocks. See the migration guide for constructor, projection, serialization, reasoning, and tool-call ID changes.

• Make AIChatMessage.content an ordered List<AIChatMessageContentBlock> and add blocks for visible text, reasoning, media, tool calls/results, provider metadata, and non-standard provider payloads (#967).
• Keep toolCalls as a derived getter. Tool-call IDs are now opaque provider or deterministic part IDs and must not be assumed to equal function names.
• Make contentAsString and ChatResult.outputAsString return visible text only; reasoning remains available through reasoning blocks.
• Serialize the canonical ordered block list while retaining support for reading legacy string/tool-call maps.
• Merge streamed blocks only by stable provider identity or explicit stream index, preserving parallel same-name tool calls and signed part boundaries.
• Add namespaced providerData to tool-call blocks and preserve it through serialization, equality, hashing, and streaming concatenation (#960).
• Add AgentStep.iteration, buildToolAgentScratchpad, and ordered message-list support in MessagePlaceholder for complete parallel-tool transcripts (#970).

0.4.1

• FEAT: Add listModels() API for LLMs and Embeddings (#371) (#844). (4b737389)

0.4.0+1

• REFACTOR: Fix pub format warnings (#809). (640cdefb)

0.4.0

Note: This release has breaking changes.

• FEAT: Upgrade to http v1.5.0 (#785). (f7c87790)
• BREAKING BUILD: Require Dart >=3.8.0 (#792). (b887f5c6)

0.3.9

• Update a dependency to the latest release.

0.3.8

• FEAT: Make CreateChatCompletionStreamResponse.choices field nullable to support Groq's OpenAI-compatible API (#742). (76fbbdc6)
• FIX: Add multi-LLM compatibility for Tool.fromFunction getInputFromJson (#738). (291a0efc)
• BUILD: Update dependencies (#751). (250a3c6)

0.3.7

• FEAT: Update dependencies (requires Dart 3.6.0) (#709). (9e3467f7)
• FEAT: Add to/fromMap serialization to ChatMessage, PromptValue & ChatHistory (#681). (d239c7c7)
• FIX: Fix linter issues (#656). (88a79c65)
• FIX: RunnableMap doesn't invoke multiple Runnables in parallel (#649). (fc722d85)

0.3.6+1

• REFACTOR: Add new lint rules and fix issues (#621). (60b10e00)

0.3.6

• FEAT: Add retry support for Runnables (#540). (1099725d)

0.3.5

• FEAT: Add copyWith method to all RunnableOptions subclasses (#531). (42c8d480)
• FEAT: Support OpenAI's strict mode for tool calling in ChatOpenAI (#536). (71623f49)
• FEAT: Deprecate OpenAIToolsAgent in favour of ToolsAgent (#532). (68d8011a)

0.3.4

• FEAT: Add Fallback support for Runnables (#501). (5887858d)
• FEAT: Implement additive options merging for cascade bind calls (#500). (8691eb21)
• REFACTOR: Remove default model from the language model options (#498). (44363e43)

0.3.3

• FEAT: Add support for ChatToolChoiceRequired (#474). (bf324f36)
• FEAT: Update ChatResult.id concat logic (#477). (44c7fafd)

0.3.2

• REFACTOR: Migrate to langchaindart.dev domain (#434). (358f79d6)
• FIX: Stream errors are not propagated by StringOutputParser (#440). (496b11cc)
• FEAT: Add Runnable.close() to close any resources associated with it (#439). (4e08cced)

0.3.1

• FEAT: Add equals to ChatToolChoiceForced (#422). (8d0786bc)
• FIX: Fix finishReason null check (#406). (5e2b0ecc)

0.3.0

Note: This release has breaking changes.
If you are using "function calling" check how to migrate to "tool calling".

• BREAKING FEAT: Migrate from function calling to tool calling (#400). (44413b83)
• BREAKING REFACTOR: Improve Tool abstractions (#398). (2a50aec2)

0.2.0+1

• FIX: Allow async functions in Runnable.mapInput (#396). (e4c35092)

0.2.0

Note: This release has breaking changes.
If you are using Runnable.fromFunction check the migration guide.

• FEAT Add support for RunnableRouter (#386). (827e262)
• FEAT: Add support for Runnable.mapInputStream (#393). (a2b6bbb5)
• FEAT: Add support for JsonOutputParser (#392). (c6508f0f)
• FEAT: Reduce input stream for PromptTemplate, LLM, ChatModel, Retriever and Tool (#388). (b59bcd40)
• BREAKING FEAT: Support different logic for streaming in RunnableFunction (#394). (8bb2b8ed)

0.1.0

Note: This release has breaking changes.
Migration guide

• BREAKING REFACTOR: Introduce langchain_core and langchain_community packages (#328). (5fa520e6)
• BREAKING REFACTOR: Simplify LLMResult and ChatResult classes (#363). (ffe539c1)
• BREAKING REFACTOR: Simplify Output Parsers (#367). (f24b7058)
• REFACTOR: Simplify internal .stream implementation (#364). (c83fed22)
• FEAT: Implement .batch support (#370). (d254f929)
• FEAT: Add reduceOutputStream option to StringOutputParser (#368). (7f9a9fae)

0.0.1-dev.2

• FEAT: Update meta and test dependencies (#331). (912370ee)

0.0.1-dev.1

• Bootstrap package.