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Attester Oracle MCP Server

by maminihds Your server? Claim it
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Attester Oracle is answering right now. Last checked moments ago. It exposes 4 tools. Last commit 10 Aug 2026.

Verify PyPI and npm packages, symbols, and version diffs against real artifacts. Free, no account.

Uptime history 52 days of history · worst day 98%
52 days agonow
100.0%
Uptime 24h
91 of 91 checks
4
Tools
read from the server
572 ms
Response time
average over 24h
0
Stars
last commit 10 Aug 2026

Attester Oracle missed 2 checks this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

run in your terminal
claude mcp add attester-mcp --transport http https://attester.dev/mcp/
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "attester-mcp": {
      "url": "https://attester.dev/mcp/"
    }
  }
}
~/.codex/config.toml
[mcp_servers.attester-mcp]
url = "https://attester.dev/mcp/"
.cursor/mcp.json
{
  "mcpServers": {
    "attester-mcp": {
      "url": "https://attester.dev/mcp/"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "attester-mcp": {
      "url": "https://attester.dev/mcp/"
    }
  }
}

Available tools 4

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

attester
attester_package_exists
Does this PyPI or npm package name really exist? Deterministic answer from the real published artifact, signed, with typosquat-adjacency flags on misses. Free: 25 calls/day per client IP, shared with the /demo/v1/* HTTP routes, reset 00:00 UTC. Higher volume: paid HTTP routes at https://attester.dev/llms.txt.
attester_symbol_exists
Does a function, class, or constant exist in this PyPI or npm package? Answer from the indexed artifact, with closest-match suggestions on misses. Free: 25 calls/day per client IP, shared with the /demo/v1/* HTTP routes, reset 00:00 UTC. Higher volume: paid HTTP routes at https://attester.dev/llms.txt.
attester_symbol_signature
Exact signature, structured params, docstring summary, and deprecation status for one symbol, resolved at a pinned version when given. Free: 25 calls/day per client IP, shared with the /demo/v1/* HTTP routes, reset 00:00 UTC. Higher volume: paid HTTP routes at https://attester.dev/llms.txt.
attester_version_diff
Symbol-level diff between two pinned versions of one package: added, removed, changed signatures, new deprecations, and a breaking/additive/neutral classification. Free: 25 calls/day per client IP, shared with the /demo/v1/* HTTP routes, reset 00:00 UTC. Higher volume: paid HTTP routes at https://attester.dev/llms.txt.

Endpoints

URLTransportStateLatencyChecked
https://attester.dev/mcp/ streamable-http answering 411 ms 0 min ago

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Attester Oracle — questions

Answers built from our own checks of this server.

What can Attester Oracle do?
It exposes 4 tools, read directly from the server on our last check. Among them: attester_package_exists, attester_symbol_exists, attester_symbol_signature, attester_version_diff. 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 Attester Oracle working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 572 ms. The bar chart above shows every period we have measured.
How do I connect Attester Oracle?
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 Attester Oracle need an API key?
No. Attester Oracle completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Attester Oracle?
It answers our handshake in 572 ms on average, which is faster than 26% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Attester Oracle open source?
Yes — it is published under the MIT licence, written in Python and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.