What is synapse-setup?

A command that checks whether the Synapse MCP background server is running and guides the user through installing it if needed. Synapse maintains a map of a codebase's abstract syntax tree, which is its structured code representation.

Use it to install and check Synapse, then enable code-structure queries, simulated safe writes, stack-trace lookup, and change-impact review.

It helps set up and verify the background service an agent needs before using Synapse's code-structure and safe-editing features.

synapse-setup — Command for Claude Code and Cursor by myelixlabs

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/myelixlabs/synapse-mcp

Made for: Claude Code, Cursor.

Or install synapse-mcp, the plugin that ships this one along with the rest of its 1 skill, 1 command, 1 plugin.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/myelixlabs/synapse-mcp/synapse-setup/github.svg)](https://agentmods.dev/commands/myelixlabs/synapse-mcp/synapse-setup)

Your own site

<a href="https://agentmods.dev/commands/myelixlabs/synapse-mcp/synapse-setup"><img src="https://agentmods.dev/badge/commands/myelixlabs/synapse-mcp/synapse-setup/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/myelixlabs/synapse-mcp/synapse-setup"><img src="https://agentmods.dev/badge/commands/myelixlabs/synapse-mcp/synapse-setup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 169 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00009	$0.00169
Opus 5.5	$0.00004	$0.00068
Sonnet 5.5	$0.00002	$0.00034
Haiku 4.5	$0.00001	$0.00017

Measured 2mo ago against content hash 1568ca4f17a3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

synapse-setup scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -fsSL https://downloads.synapse-mcp.dev/install.sh | sh

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -fsSL https://downloads.synapse-mcp.dev/install.sh | sh

commands/synapse-setup.md · 18 lines

What it actually says

Synapse Setup

Check if Synapse MCP is running on http://127.0.0.1:8585/mcp.
If it is not responding, instruct the user to install the background service by running:
```
curl -fsSL https://downloads.synapse-mcp.dev/install.sh | sh
```
Wait for the user to confirm installation is complete.
Once running, explain that the agent now has a persistent AST map of the entire codebase and can:
- Query code structure in microseconds instead of grepping files
- Perform safe writes with in-memory simulation and auto-rollback
- Resolve stack traces against the AST graph
- Review changes for blast radius before pushing

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 18 lines · 9 tokens per session scan C 1568ca4f17a3

Subscribe to this mod's changes

synapse-setup is a command published in the GitHub repository myelixlabs/synapse-mcp (7 stars, last pushed 1mo ago), licensed MIT. It adds 9 tokens to every session and 169 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

ai-coding code-intelligence developer-tools mcp mcp-server model-context-protocol

synapse-setup next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
synapse-setupmyelixlabs/synapse-mcp	Command	7	1mo ago	MIT	C	9	Claude Code, Cursor
compileAURORA-NEURO/aurora-agent	Command	1	10d ago	Apache-2.0	A	25	Claude Code
checklistgithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code
clarifygithub/spec-kit	Command	148k	yesterday	MIT	A	27	Claude Code
specifygithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code
analyzegithub/spec-kit	Command	148k	yesterday	MIT	A	26	Claude Code
convergegithub/spec-kit	Command	148k	yesterday	MIT	A	35	Claude Code

synapse-setup