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Asynthetic MCP server

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by asyntheticai·io.github.asyntheticai/asynthetic·v0.1.3
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Ground truth for AI coding agents: what breaks between library versions and how to fix it

C65/100grade C
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Safety scan
C65/100

full report

Adoption
Growing

0 stars34 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Asynthetic tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.9 · 2026-09-23 · same rubric, same numbers if you re-run it

1 high
  • Code scan18 source files scanned25/25
  • Live reliabilityremote unreachable: Streamable HTTP error: Error POSTing to endpoint: {"status":"error","code":404,"message":"Application not found","request_id":"DHay8xDyS3SAom_hY53eZw"}0/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 80 days ago12/15
  • Maintainer identityregistry namespace matches repository owner6/10

Findings (1)

  • highRemote endpoint did not respondreliability.unreachable

    Streamable HTTP error: Error POSTing to endpoint: {"status":"error","code":404,"message":"Application not found","request_id":"DHay8xDyS3SAom_hY53eZw"}

Overall 65/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install Asynthetic in Claude Code, Cursor or VS Code

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

What the publisher says

From the Asynthetic repository's README, as published. We do not edit it. Read it on GitHub

Asynthetic

Ground truth for AI coding agents.

Your agent's knowledge froze on a date. Asynthetic tells it exactly what changed — every breaking change between library versions, cited and tested.

claude mcp add --transport http asynthetic https://asynthetic.up.railway.app/mcp
// agent asks: get_migration("ai", "^4.0.0", "^5.0.0")
{
  "found": true,
  "verification_level": "medium",
  "migration": {
    "breaking_changes": [
      {
        "title": "maxTokens renamed to maxOutputTokens",
        "before_code": "generateText({ model, maxTokens: 1024, prompt })",
        "after_code":  "generateText({ model, maxOutputTokens: 1024, prompt })",
        "source_url": "https://ai-sdk.dev/docs/migration-guides/migration-guide-5-0"
      }
      // …22 more, every one cited
    ]
  }
}

Models improve every month. Their knowledge still ends on a date.

Every coding agent ships with a knowledge freeze date. The libraries it writes against don't.

So agents do what the training data taught them: they write maxTokens into AI SDK 5 (removed), synchronous params into Next.js 15 (now a Promise), LangChainAdapter imports from a package that no longer exports them. The code looks right. The agent is confident. The build breaks — or worse, it doesn't, and the bug ships.

Tools that fetch current documentation tell agents what the API looks like today. That's half the problem. An upgrade needs the diff: what changed, what replaced it, and what silently behaves differently. No amount of "current docs" contains that.

Asynthetic is that missing half. Ask it about an upgrade, and it returns a hand-curated migration map: ordered breaking changes with before/after code, deprecation timelines, peer-version requirements, and a citation for every claim. Retrieval, never generation — the same question gets the same verified answer every time.

Before / after

Without Asynthetic — the agent "upgrades" your AI SDK app from memory: keeps result.usage for billing (now silently counts only the final step), leaves temperature unset (v5 removed the implicit 0 — output turns nondeterministic), renames nothing because v4 syntax was correct when the model trained.

With Asynthetic — one tool call returns all 23 breaking changes for that exact version window, including the three above, each with the fix and the official source. The agent applies facts. You review a diff instead of debugging a regression.

That's the product: the difference between an agent that remembers and an agent that knows.

What a map gives your agent

The next 14→15 map is Asynthetic's first verification_level: high: every entry tested against real builds on 14.2.35 and 15.5.20, across Turbopack and Webpack, dev and production.

Install

Hosted (nothing to install):

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

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Asynthetic: common questions

Is Asynthetic MCP server safe?
With care: it is graded C, so read the findings first (65/100). Read the Asynthetic safety report
How do I install Asynthetic?
It runs remotely at asynthetic.up.railway.app. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Asynthetic need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Asynthetic maintained?
The last commit was 85 days ago (2026-07-05). The latest release is v0.1.3.
Is Asynthetic up?
0% of our last 28 checks got an answer. We check remote servers about four times a day.

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