Catalog›MCP servers›Developer tools›dev.toolc/toolcDTdev.toolc/toolcOptimizing compiler for agent tools: many MCP servers or REST APIs in, one lean endpoint out. Open site Website Open in the app JSON README (API)READMELoading documentation…# toolc **The optimizing compiler for agent tool surfaces.** Point it at your MCP servers, or just a REST API's OpenAPI spec, or even a docs page, and get back one endpoint that serves a smaller, smarter tool surface: cheaper for every agent that connects, more accurate on every task, with every call logged. Connecting N MCP servers dumps every tool definition into the model's context, degrades tool selection, and forces improvised multi-hop call chains. toolc compiles the federation instead: - **Rewrite**: LLM-optimized descriptions with sibling disambiguation - **Consolidate**: families of near-duplicate tools (`search_x`/`find_x`/`get_x`) merge into single facade tools with deterministic routing - **Selection**: the whole catalog compresses behind two meta-tools (`search_tools`/`call_tool`) when you want maximum context savings - **Compaction**: oversized results are summarized at serve time, preserving identifiers and sourcing details - **Compose**: REST APIs join the pool straight from an OpenAPI spec, or from a drafted spec synthesized from their documentation - **Observe**: every call logged with arguments and results; recurring errors cluster into recommended fixes ## Benchmark 131 tools across 5 live servers, 30 tasks × 3 trials, judged answers ([full grid](https://github.com/toolc-dev/toolc/blob/HEAD/docs/benchmark-2026-08-09.md) · [consolidation run](https://github.com/toolc-dev/toolc/blob/HEAD/docs/benchmark-consolidate-2026-08-10.md)): | condition | success | cost / completed task | tool-def context | |---|---|---|---| | raw (all 131 tools) | 96.7% | $0.2631 | ~24,360 tok | | **compiled + consolidate** | 96.7% | **$0.0411 (6.4× cheaper)** | ~845 tok | | **consolidate, no selection** | **100.0%** | $0.1335 | ~14,506 tok | Consolidation dominates both ends of the frontier: the selection surface is the cost lever, consolidation lifts accuracy everywhere. Every pass is a config toggle; pick the tradeoff per deployment. ## Quick start ```sh git clone https://github.com/toolc-dev/toolc && cd toolc pnpm install && pnpm -r test # describe your federation cp toolc.config.example.jsonc toolc.config.jsonc # introspect it node packages/cli/bin/toolc.mjs -c toolc.config.jsonc inspect # compile (set ANTHROPIC_API_KEY for the rewrite/consolidate passes) node packages/cli/bin/toolc.mjs -c toolc.config.jsonc compile # serve the compiled surface over stdio (add to Claude as an MCP server) node packages/cli/bin/toolc.mjs -c toolc.config.jsonc serve --mode compiled ``` A downstream can be an MCP server or a bare REST API: ```jsonc { "downstream": [ { "id": "gh", "transport": { "type": "http", "url": "https://api.githubcopilot.com/mcp/" } }, { "id": "nws", "transport": { "type": "openapi", "spec": "https://api.weather.gov/openapi.json" } } ] } ``` See [SELF_HOSTING.md](https://github.com/toolc-dev/toolc/blob/HEAD/SELF_HOSTING.md) for Docker deployment. ## Hosted [toolc.dev](https://toolc.dev) runs this same engine as a managed service: compiled HTTPS endpoints, a console with a playground and full-payload log explorer, docs-to-spec drafting, and error-driven fix recommendations. ## Layout - `packages/core`: IR (Capability Graph), frontends (MCP, OpenAPI, docs synthesis), passes, emit - `packages/gateway`: runtime MCP server (mirror + compiled) with call logging and compaction - `packages/cli`: the `toolc` command - `packages/harness`: benchmark runner, grading, reports - `packages/shared`: config schema, errors ## License The engine (everything in this repository) is Apache-2.0, forever: anyone can compile and serve their own tool surfaces locally with the exact same compilation quality as the hosted product. DetailsTypeMCP serversTopicDeveloper toolsPublisherdev.toolcSourceofficialCategoryToolsWhere it runsOn my computerVersion0.1.1Last updateSep 15, 20262 months agoProject statusActiveLanguageTypeScriptLicenseApache-2.0AddedSep 15, 20262 months agoUpdatedSep 15, 20262 months agoSource iddev.toolc/toolcMoreMore mcp servers on Developer toolsAll from dev.toolcA–Z index
