Synapse MCP

Supercharge your AI coding agent with sub-millisecond, structural code intelligence.

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CB[maker]· 1mo ago
Great question Zain, Synapse listens to the native filesystem event watcher ie. inotify for Linux, fsevents/mac_listener for macOS, and inotify-win for Windows. The OS watcher streams file events back to Synapse, triggering embedding updates and keeping Synapse's structural code graph up to date in near real time. Hope that helps.
Zain Sheikh· 1mo ago
The framing is right: most of the token burn is search, not generation, so a prebuilt local knowledge graph attacks the actual bottleneck. How does it stay in sync as the codebase changes?

Your AI agent is burning most of its tokens finding code. Not writing it. Finding it.

Synapse MCP fixes that. It's a free, 100% local MCP server that gives your agent a pre-built knowledge graph of your entire codebase. One tool call. Exact results. Your code never leaves your machine.

PROOF — same model, same task, same codebase:

−60% token spend
2.2× faster
−47% tool calls
Identical accuracy

WHAT CHANGES:

Before: agent greps, opens 12 files, still gets it wrong. After: one call returns the exact symbol, every caller, and the relevant tests.
Before: a bad write fails lint and leaves your file broken. After: edits are simulated, validated, and rolled back automatically on failure.
Before: every session starts from zero. After: the graph persists and learns — future sessions start ahead.

FREE: semantic search, caller graphs, codebase X-ray, 50 languages, zero cloud.

PRO: safe writes, crash resolution, change review, dead code analysis, persistent memory. Token savings typically cover it in a day.

Works with: Cursor · Claude Code · Copilot · Cline · Aider · Devin · VS Code · Windsurf · Warp and more.

COMING Q3 2026 — Myelix Agents: agents that plan before they code, validate in real time, and get smarter overnight. Pro subscribers get early access.

synapse-mcp.dev

SYNAPSE PRO IS FREE FOR FIRST 1000 DEVHUNT USERS (Until End of November), use promo code DEVHUNT

AI Agents MCP CLI Workflow automation NoCode AI Code AI Coding

Synapse MCP provides a local, AST-aware code-knowledge graph that lets AI agents retrieve exact code context and safely simulate edits.

for: Developers using AI coding agents who need fast, accurate code context without cloud exposure.
pricing: freemium
license: MIT

myelixlabs/synapse-mcp 3 1updated 11 days ago

works withCursorClaude CodeWindsurfGitHub CopilotDevinAiderClineVS CodeJetBrains AI

Key features

6 features of Synapse MCP

Instant Local Indexing — Indexes 10,000+ files across 50 languages in seconds with zero cloud dependencies.
AST-Aware Minification — Compresses code context to structural signatures, cutting token usage by up to 60%.
Safe Write Simulation — Validates edits in memory and rolls back automatically if they break the build (Pro).
Impact & Caller Analysis — Shows all callers and dependencies of a symbol in under 500 ms (Pro).
Crash Stack Resolution — Maps stack traces directly to the AST graph for instant root-cause analysis (Pro).
Test Intelligence — Identifies coverage gaps and suggests precise test targets without running the suite (Pro).

Use cases

Refactor a legacy module across multiple services with guaranteed compile-time safety
Diagnose a production crash by pasting a stack trace and instantly locating the failing code
Generate targeted tests for uncovered branches identified by the AST graph

Synapse MCP vs alternatives

all alternatives →

	Synapse MCP	Fine	Pieces Copilot	BuildShip	Pocketenv
Best for	AST-aware local code intelligence	General AI-assisted coding	Workflow-aware AI assistance	Visual backend creation	Agent sandboxing
Pricing	Freemium	Free	Free	Free	Free
DevHunt upvotes	6	75	63	118	73
Launched	Aug 2026	Jan 2023	Mar 2024	Jan 2023	Apr 2026

Synapse MCP vs Fine: Focuses on building software with AI agents but lacks local AST graph and safe-write simulation.
Synapse MCP vs Pieces Copilot: Provides an AI coding sidekick that learns workflow, but does not offer structural code indexing or local execution.
Synapse MCP vs BuildShip: AI-powered visual backend builder, not a code-context engine for agents.
Synapse MCP vs Pocketenv: Offers a universal sandbox runtime for agents, whereas Synapse MCP provides code-graph intelligence and safe writes.

Synapse MCP FAQ

What is Synapse MCP and how does it work?+

It runs a local server that builds an AST-based knowledge graph of your entire codebase and serves precise context to AI agents via the Model Context Protocol.

How fast are graph queries?+

Queries execute in microseconds to nanoseconds locally; indexing a 10k-file repo takes only seconds.

What’s the difference between Free and Pro editions?+

Free provides full AST indexing and basic search; Pro adds deep graph exploration, safe-write simulation, crash-trace resolution, test intelligence and persistent encrypted memory.

Does my code leave the machine?+

No, Synapse MCP runs 100 % locally with end-to-end encryption, so no code is uploaded to the cloud.

Summarized by DevHunt from synapse-mcp.dev · Sep 28, 2026. Details may change; check the official site.