> ## Documentation Index > Fetch the complete documentation index at: https://cognis.vasanth.xyz/llms.txt > Use this file to discover all available pages before exploring further. # cognis > Umbrella crate. Re-exports the foundation, LLM, RAG, and graph layers, plus the agent layer. The umbrella crate. Most apps depend on this and write `use cognis::prelude::*;`. It re-exports the four sibling capability crates and adds the agent layer (builder, multi-agent orchestration, memory, middleware, built-in tools, observers, eval). ## Crate metadata | Field | Value | | ---------------- | ------------------------------------------------------------------------------ | | Latest version | `0.3` | | docs.rs | [docs.rs/cognis](https://docs.rs/cognis) | | Repo path | [`crates/cognis`](https://github.com/0xvasanth/cognis/tree/main/crates/cognis) | | Default features | `openai`, `ollama` | ## What's exported | Re-exported from | Path | | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `cognis-core` | `cognis::cognis_core::*` (the crate) plus flat top-level (e.g. `cognis::Message`, `cognis::Runnable`, `cognis::RunnableConfig`, `cognis::Event`, `cognis::Observer`). | | `cognis-graph` | `cognis::cognis_graph::*` plus `cognis::Graph`, `cognis::node_fn`, `cognis::Goto`, `cognis::NodeOut`, `cognis::GraphState`, `cognis::Checkpointer`, `cognis::InMemoryCheckpointer`, `cognis::CompiledGraph`. | | `cognis-llm` | `cognis::cognis_llm::*` plus `cognis::Client`, `cognis::Tool`, `cognis::ToolDefinition`, `cognis::ToolInput`, `cognis::ToolOutput`, `cognis::ToolRegistry`. | | `cognis-rag` | `cognis::cognis_rag::*` plus `cognis::Document`, `cognis::Embeddings`, `cognis::InMemoryVectorStore`, `cognis::VectorStore`, `cognis::SearchResult`, retrievers, transformers. | ## What lives in the umbrella itself | Module | What | | -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `agent` | `AgentBuilder`, `Agent`, `AgentResponse`, `AgentState`, `default_react_graph`, lifecycle, plugins. | | `agent_bus` | `AgentBus`, `Subscription`, `SubscribeError`. | | `agent_events` | `AgentEvent`, `AgentEventBus`, `EventSubscription`, `DEFAULT_EVENTS_TOPIC`. | | `backend` | `Backend`, `InMemoryStorageBackend`, `LocalFsStorageBackend`, `SandboxedFsBackend`, `MemoryBackend`. | | `eval` | `EvalRunner`, `EvalCase`, `EvalRow`, `EvalReport`, `Evaluator` trait, plus built-in `ExactMatch`, `Contains`, `LlmJudge`. | | `history` | Conversation persistence helpers. | | `middleware` | The full middleware catalog (see [Middleware](/building-agents/middleware)). | | `multi_agent` | `MultiAgentOrchestrator`, `Sequential`, `Supervisor`, `ParallelVote`, `RoundRobin`, `HandoffStrategy`. | | `observers` | `TracingObserver` — stdout-friendly observer for local debugging. | | `presets` | Out-of-the-box agent recipes. | | `retrievers` | LLM-driven retrievers (multi-query expansion, contextual compression). | | `session` | `Session`, `SessionStore`, `InMemorySessionStore`. | | `skills` | Reusable agent skills. | | `telemetry` | Lightweight metrics. | | `tools` | Built-in tools — `Calculator`, file tools (`FileReadTool`/`FileWriteTool`/`FileEditTool`/`FileListTool`/`FileGlobTool`/`FileGrepTool`/`FileExistsTool`), `JsonQueryTool`, `PythonReplTool`, `HumanTool`, `ShellTool`, `SubAgentTool`, `RetrieverTool`. Plus `ToolOrchestrator`, `ExecutionPlan`, `ToolStep`, and the approval primitives (`Approver`, `Decision`, `AllowList`, `AutoApprove`, `RejectAll`, `ApprovalGatedTool`). HTTP / OpenAPI / web-search / Wikipedia tools (`HttpRequest`, `OpenApiToolset`, `WebSearchTool`, `TavilyProvider*`, `WikipediaTool`) are gated behind the `tools-http` feature. | ## prelude `use cognis::prelude::*;` brings in: * The umbrella's flat top-level re-exports. * `Distance`, `Embeddings`, `InMemoryVectorStore`, `SearchResult`, `VectorStore`. * `async_trait::async_trait`. * The `RunnableExt` trait so `pipe`, `with_max_retries`, `with_timeout`, etc. are in scope. * Common memory variants and their constructors. If something feels like it should be importable, try `cognis::prelude` first. ## Feature flags | Feature | Pulls in | | --------------- | ------------------------------------------------------------------- | | `openai` | OpenAI provider in `cognis-llm`, OpenAI embeddings in `cognis-rag`. | | `anthropic` | Anthropic provider. | | `google` | Google provider + embeddings. | | `ollama` | Ollama provider + embeddings (default). | | `azure` | Azure OpenAI provider. | | `voyage` | Voyage embeddings. | | `all-providers` | All of the above. | | `tools-http` | HTTP tool primitives. | | `cache-sqlite` | SQLite-backed cache. | See [Feature flags](/reference/feature-flags) for the full table. ## See also Foundation crate. LLM clients & providers. RAG building blocks. Graph engine. Observability. Proc macros.