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by espetro
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Rust
Hybrid

Try it now

cauce.fyi is the public instance. Docs at docs.cauce.fyi

Related MCP server: MCP Web Tools

Install it

# install script (macOS and Linux)
curl -fsSL https://raw.githubusercontent.com/espetro/cauce/main/install.sh | sh

# or mise
mise use -g github:espetro/cauce

# or from source
cargo install --locked --git https://github.com/espetro/cauce cauce-cli

cauce serve        # UI + API + MCP on http://127.0.0.1:4479

More options (release tarballs, a checkout build): docs/install.md

What it does

  • One web UI, one HTTP API, one MCP server, all reading the same TTL cache.

  • Tail-tolerant fan-out over pluggable engines (declarative YAML, exec, replay) with hedging and circuit breakers.

  • Grounded AI answers at POST /api/answer, with optional BYOK and a free daily-answer budget for public instances.

  • Local archive + search history in SQLite FTS5, or pluggable in-memory / edge storage (MemoryStore).

  • Self-hosted, local-first, and edge-ready: a single Rust binary, loopback by default; compile or embed as WASM / Serverless (Cloudflare Workers, Spin, AWS Lambda) via pure Store and tower::Service traits.

Stack

Path

What it owns

crates/cauce-core

Search pipeline, Store (MemoryStore) + Engine traits

crates/cauce-server

axum HTTP/SSE/MCP, embedded Svelte SPA at /app, WASM harness

crates/cauce-engines

Declarative / exec / replay engine runtimes

crates/cauce-store-sqlite

rusqlite Store implementation

crates/cauce-agent

Grounded-answer agent loop

crates/cauce-cli

cauce serve / search / engine / cache / record

engines/

YAML engine specs + fixtures

sdk/python

exec-protocol SDK + ddgs reference engine

End-user docs: docs.cauce.fyi · developer docs: .agents/docs/

Filing a bug? GET /api/report or cauce report produces a redacted JSON bundle to attach. See docs/reporting.md.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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