v0.1.13 Release Notes

Highlight: MongoDB Vector Store Integration

We're excited to announce full MongoDB vector store support, one of our most requested features!

• Complete MongoDB vector store implementation with production-ready features
• Comprehensive documentation and examples
• Containerized testing suite for reliability
• Upgraded to mongo-go-driver v2.0.0 for improved performance
• Thanks to @prestonvasquez for this significant contribution!

Major Features & Improvements

• Added Mistral embeddings support with PGVector example by @mathiasb
• Added Perplexity AI tool integration by @sklinkert
• Added support for OpenAI structured output and image+text content by @lifejwang11
• Added fake LLM package for testing by @devalexandre

Provider Updates

OpenAI

• Reflected max_token field deprecation
• Added completion_tokens_details to usage response
• Added reasoning tokens support for both regular and streaming responses
• Added O1-preview example and documentation

Google AI

• Added system instructions support for Vertex
• Added JSONMode and ResponseMIMEType support
• Improved test resilience for model randomness

Anthropic

• Added beta header support
• Improved error event type handling

Mistral

• Updated dependency version
• Added support for default llms.WithTools implementation

DeepSeek

• Added ReasoningContent field for reasoner model by @semioz

Breaking Changes

• Upgraded to mongo-go-driver v2.0.0
• Replaced deprecated agents.Initialize in examples

Detailed Changelog

What's Changed

• googleai: add support for system instructions in vertex too by @eliben in https://github.com/tmc/langchaingo/pull/930
• googleai: refactor shared test a bit and make it more resilient to model randomness by @eliben in https://github.com/tmc/langchaingo/pull/936
• googleai: update dependency version by @eliben in https://github.com/tmc/langchaingo/pull/939
• anthropic: add support for beta header by @tmc in https://github.com/tmc/langchaingo/pull/967
• anthropic: add improved handling of other error event types by @tmc in https://github.com/tmc/langchaingo/pull/1012
• openai: reflect max_token field deprecation by @tmc in https://github.com/tmc/langchaingo/pull/1013
• openai: add completion_tokens_details to usage response by @tmc in https://github.com/tmc/langchaingo/pull/1014
• openai: add reasoning tokens to usage response by @tmc in https://github.com/tmc/langchaingo/pull/1015
• openai: add reasoning tokens to streaming response by @tmc in https://github.com/tmc/langchaingo/pull/1016
• examples: add openai o1-preview example by @tmc in https://github.com/tmc/langchaingo/pull/1017
• examples: improve o1 readme by @tmc in https://github.com/tmc/langchaingo/pull/1020
• examples: update to v0.1.13-pre.0 by @tmc in https://github.com/tmc/langchaingo/pull/1021
• llms: fix unkeyed fields in GenerateFromSinglePrompt struct by @iocron in https://github.com/tmc/langchaingo/pull/926
• ci: upgrade golangci lint version by @wangjiancn in https://github.com/tmc/langchaingo/pull/928
• examples: add perplexity completion example by @sklinkert in https://github.com/tmc/langchaingo/pull/977
• agents: optimize the mrkl prompt by @Alan796 in https://github.com/tmc/langchaingo/pull/976
• docs: fix Type method missing from OutputParser by @chxru in https://github.com/tmc/langchaingo/pull/972
• outputparser: improve BooleanOutputParser by @amitaifrey in https://github.com/tmc/langchaingo/pull/978
• outputparser: improve DefinedOutputParser by @amitaifrey in https://github.com/tmc/langchaingo/pull/980
• textsplitter: add option to join table rows by @corani in https://github.com/tmc/langchaingo/pull/981
• googleai: add support for JSONMode and ResponseMIMEType by @mheck136 in https://github.com/tmc/langchaingo/pull/984
• openai: add support for sending structured output request for chat completions api by @takeyamakenta in https://github.com/tmc/langchaingo/pull/986
• redisvector: fix score threshold option by @acrmp in https://github.com/tmc/langchaingo/pull/1003
• milvus: add skipFlushOnWrite option by @fatedier in https://github.com/tmc/langchaingo/pull/992
• outputparser: use strings.Cut in structured parser by @anuraaga in https://github.com/tmc/langchaingo/pull/997
• examples: replace deprecated agents.Initialize by @treywelsh in https://github.com/tmc/langchaingo/pull/1009
• bedrock: fix unchecked error when stream channel is closed by @lucaronca in https://github.com/tmc/langchaingo/pull/998
• llms: add fake package by @devalexandre in https://github.com/tmc/langchaingo/pull/935
• examples: update pgvector README to use compose v2 by @elnoro in https://github.com/tmc/langchaingo/pull/969
• llms/mistral: add support for default WithTools implementation by @douglarek in https://github.com/tmc/langchaingo/pull/970
• vectorstores: add mongovector by @prestonvasquez in https://github.com/tmc/langchaingo/pull/1005
• lint: fix settings and refactor package by @tmc in https://github.com/tmc/langchaingo/pull/1018
• vectorstores: fix cosine similarity score calculation by @avi3tal in https://github.com/tmc/langchaingo/pull/1048
• internal: fix data races by @nktks in https://github.com/tmc/langchaingo/pull/1080
• tools: add perplexity AI by @sklinkert in https://github.com/tmc/langchaingo/pull/1061
• vectorstores/weaviate,pinecone: do not return error when zero documents are retrieved by @mdelapenya in https://github.com/tmc/langchaingo/pull/1077
• examples: add OpenAI json structured example by @lifejwang11 in https://github.com/tmc/langchaingo/pull/1098
• textsplitter: add optional lenFunc to MarkdownTextSplitter by @pedramr in https://github.com/tmc/langchaingo/pull/1096
• llms/mistral: implement embeddings.EmbedderClient for Mistral and add PGVector example by @mathiasb in https://github.com/tmc/langchaingo/pull/1086
• vectorstores/weaviate: fix client creator by @taigrr in https://github.com/tmc/langchaingo/pull/1109
• examples: add image and text content example for openai by @lifejwang11 in https://github.com/tmc/langchaingo/pull/1099
• test: containerize mongovector tests by @prestonvasquez in https://github.com/tmc/langchaingo/pull/1025
• deps: update mistral go version by @fstau in https://github.com/tmc/langchaingo/pull/1102
• deps: upgrade to mongo-go-driver v2.0.0 by @prestonvasquez in https://github.com/tmc/langchaingo/pull/1087
• docs: update Discord invite link in README by @danielmerja in https://github.com/tmc/langchaingo/pull/1118
• docs: add mongovector README and example by @prestonvasquez in https://github.com/tmc/langchaingo/pull/1063
• llms/deepseek: add ReasoningContent field for reasoner model by @semioz in https://github.com/tmc/langchaingo/pull/1121
• docs: fix documentation publishing by @FluffyKebab in https://github.com/tmc/langchaingo/pull/1123
• docs: fix artifact upload in documentation publishing by @FluffyKebab in https://github.com/tmc/langchaingo/pull/1124

New Contributors

• @iocron made their first contribution in https://github.com/tmc/langchaingo/pull/926
• @Alan796 made their first contribution in https://github.com/tmc/langchaingo/pull/976
• @chxru made their first contribution in https://github.com/tmc/langchaingo/pull/972
• @amitaifrey made their first contribution in https://github.com/tmc/langchaingo/pull/978
• @mheck136 made their first contribution in https://github.com/tmc/langchaingo/pull/984
• @takeyamakenta made their first contribution in https://github.com/tmc/langchaingo/pull/986
• @acrmp made their first contribution in https://github.com/tmc/langchaingo/pull/1003
• @anuraaga made their first contribution in https://github.com/tmc/langchaingo/pull/997
• @treywelsh made their first contribution in https://github.com/tmc/langchaingo/pull/1009
• @lucaronca made their first contribution in https://github.com/tmc/langchaingo/pull/998
• @prestonvasquez made their first contribution in https://github.com/tmc/langchaingo/pull/1005
• @avi3tal made their first contribution in https://github.com/tmc/langchaingo/pull/1048
• @nktks made their first contribution in https://github.com/tmc/langchaingo/pull/1080
• @lifejwang11 made their first contribution in https://github.com/tmc/langchaingo/pull/1098
• @pedramr made their first contribution in https://github.com/tmc/langchaingo/pull/1096
• @mathiasb made their first contribution in https://github.com/tmc/langchaingo/pull/1086
• @taigrr made their first contribution in https://github.com/tmc/langchaingo/pull/1109
• @fstau made their first contribution in https://github.com/tmc/langchaingo/pull/1102
• @danielmerja made their first contribution in https://github.com/tmc/langchaingo/pull/1118

Full Changelog: https://github.com/tmc/langchaingo/compare/v0.1.12...v0.1.13