Asynthetic MCP Server

by asyntheticai Your server? Claim it

not responding

Asynthetic is listed as active in the registry but did not answer our last check. 56 installs a week from npm. It exposes 5 tools. Last commit 5 Jul 2026.

Ground truth for AI coding agents: what breaks between library versions and how to fix it

Installs per day peak 214 · avg 24 · -39% w/w

a month agotoday

Uptime history 51 days of history · worst day 0%

51 days agonow

0.0%

Uptime 24h

0 of 182 checks

Tools

read from the server

350 ms

Response time

average over 24h

Installs / week

npm and PyPI

Asynthetic does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add asynthetic --transport http https://asynthetic.up.railway.app/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "asynthetic": {
      "url": "https://asynthetic.up.railway.app/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.asynthetic]
url = "https://asynthetic.up.railway.app/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "asynthetic": {
      "url": "https://asynthetic.up.railway.app/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "asynthetic": {
      "url": "https://asynthetic.up.railway.app/mcp"
    }
  }
}

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

available

list_available_maps

Lists every migration map in the store: package, ecosystem, from_version, to_version, status (draft/verified/stale), last_verified. Optional filters: ecosystem, package. Use this to discover coverage before calling get_migration.

breaking

get_breaking_changes

Returns the breaking changes introduced when upgrading TO the given version of a package (matched by major version against curated migration maps), with source citations and last_verified dates. Accepts concrete versions or SemVer ranges ("15", "^15.0.0", "15.x"); resolution is disclosed via match_type/resolved_via. If found=false, no verified data exists — do not guess.

compatibility

check_compatibility

PLANNED: project-aware compatibility analysis. Currently returns implemented=false and no data. Do not infer compatibility (or incompatibility) from this response. For a static SemVer check between two known package versions, use check_peer_compatibility instead.

migration

get_migration

Returns the verified migration map for upgrading a package between two versions: ordered breaking changes with before/after code, deprecations, source-citation URLs, and a last_verified date. Accepts concrete versions or SemVer ranges (e.g. "^14.2.0", "~14.1.0", "15.x"); non-exact lookups resolve to the covering map and disclose how via match_type/resolved_via/match_note. If found=false, no verified data exists — do not guess.

peer

check_peer_compatibility

Static SemVer check of two known package versions against curated compatible_with peer data from migration maps. Purely declarative — no filesystem access or project inspection (that is the scope of the separate, unimplemented check_compatibility). Returns compatible: true | false | "unknown". Treat "unknown" as absence of curated data, never as evidence of incompatibility.

Endpoints

URL	Transport	State	Latency	Checked
https://asynthetic.up.railway.app/mcp	streamable-http	answering	350 ms	7 min ago
https://asynthetic.up.railway.app/sse	sse	answering	347 ms	7 min ago

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Asynthetic — questions

Answers built from our own checks of this server.

What can Asynthetic do?

It exposes 5 tools, read directly from the server on our last check. Among them: check_compatibility, check_peer_compatibility, get_breaking_changes, get_migration, list_available_maps. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Asynthetic working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 182 checks got a reply (0.0%), average response time 350 ms. The bar chart above shows every period we have measured.

The registry lists Asynthetic as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Asynthetic?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Asynthetic need an API key?

No. Asynthetic completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How many people use Asynthetic?

The npm package asynthetic was installed 56 times in the last week. Week over week that is -39%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Asynthetic open source?

No, and the distinction matters: its licence is declared as BUSL-1.1. That makes it source-available — you can read the code, but the terms are the author's own, not one of the recognised open-source licences. Read them before you build on it.