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lunge

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lunge

An agent-native advanced API client - execute and test REST, GraphQL, WebSocket, SSE, and (later) gRPC requests from any MCP-capable AI agent. No GUI, no manual clicking, no heavyweight desktop app. Think advanced curl, native for agents.

It is a lightweight, token-efficient alternative to Postman/Bruno for the era of AI coding agents. The agent calls tools directly; there are no humans in the loop and no bloated feature surface to pay for.

Why this exists

Pain with Postman/Bruno

lunge approach

Require human clicking in a GUI

Agent-native: everything is an MCP tool call

Postman is heavy, enterprise features are paywalled

Small, open, single local binary + thin MCP layer

Verbose responses blow up the LLM context window

Rust core summarizes/compresses output before it reaches the agent

Collections are locked into proprietary formats

Plain YAML/JSON files, git-friendly

Separate tools per protocol

One server for REST/GraphQL/WS/SSE/gRPC

Related MCP server: Relay

Design pillars

  1. Agent-native - designed for LLM tool calls, not human UIs.

  2. Token-efficient - every response is filtered, truncated, and summarized. Full payloads are spilled to disk and referenced by handle so the context stays small.

  3. Fast & portable - a Rust core (execution + protocols + summarization) exposed to a thin TypeScript MCP layer via napi-rs.

  4. Both ad-hoc and reusable - agents can fire one-off requests or create, save, and re-run declarative collections stored as files.

Documents

Doc

Contents

architecture.md

System design, the Rust/TS split, module layout, streaming strategy, FFI boundary

features.md

Full feature list by protocol + cross-cutting features (auth, vars, assertions, token optimizer)

mcp-tools.md

The MCP tool surface: names, inputs, outputs, examples

collection-format.md

The declarative YAML/JSON test/collection format

roadmap.md

Phased delivery plan from scaffolding to gRPC and CI

Decisions locked in

  • Stack: Rust core via napi-rs + TypeScript MCP layer (@modelcontextprotocol/sdk).

  • Distribution: local dev tool over stdio transport (used by Cursor/Windsurf/Claude Desktop).

  • Test definition: both ad-hoc agent calls and persisted declarative collections.

  • MVP protocols: REST, GraphQL, WebSocket, SSE. gRPC is a later phase.

This server cannot be deployed

Shareable, User-Owned Context BackendPeople, applications, and agents read, write, and coordinate together in one context lake. Reach it over MCP, a CLI, a Python SDK, or REST.fulcradynamics.comAd

Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

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