Browse available middleware for different providers or contribute your own to the ecosystem. Learn more about how middleware works in the middleware overview and how to use middleware with Deep Agents in the Deep Agents docs.Documentation Index
Fetch the complete documentation index at: https://docs.langchain.com/llms.txt
Use this file to discover all available pages before exploring further.
Share your middleware
Middleware enables context engineering, harness customization, and runtime safety controls. It is a useful extension point in LangChain and we love highlighting what the community builds with it:Add an official integration
Follow the contributing guide to build and publish a middleware package.
Share a community middleware
Open a PR to the docs repo to add your middleware to the table below.
Official integrations
| Provider | Middleware available | Source |
|---|---|---|
| Anthropic | Prompt caching, bash tool, text editor, memory, and file search | langchain-ai/langchain |
| AWS | Prompt caching | langchain-ai/langchain-aws |
| Microsoft Foundry | Text moderation, image moderation, prompt shield, protected material, and groundedness | langchain-ai/langchain-azure |
| OpenAI | Content moderation | langchain-ai/langchain |
Community integrations
| Middleware | Description | Source |
|---|---|---|
| Cisco AI Defense | Runtime security inspection | cisco-ai-defense/ai-defense-langchain-middleware |
| compact-middleware | Claude Code’s compaction engine as LangChain middleware. Multi-level context compaction for long-running agents. | emanueleielo/compact-middleware |
| langchain-collapse | Preventive context management. Collapses consecutive tool-call groups before they fill the context window. | johanity/langchain-collapse |
| langchain-task-steering | Implicit state-machine middleware for ordered task pipelines with per-task tool scoping, dynamic prompt injection, and composable completion validation. | edvinhallvaxhiu/langchain-task-steering |
| advisor-middleware | Claude Code’s advisor pattern as LangChain middleware. Pairs a fast executor model with a powerful advisor model that intervenes only on critical decisions. | emanueleielo/advisor-middleware |
| langchain-router | Phase-based model routing. Routes execution turns to a fast model, keeps the primary for planning and recovery. | johanity/langchain-router |
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