Attester Oracle is an MCP server with 4 tools an agent can call, among them attester_package_exists, attester_symbol_exists, attester_symbol_signature. It answers at https://attester.dev/mcp/ over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 4 of 6 times since 11 September 2026; the last check, on 22 October 2026, succeeded.
Verify PyPI and npm packages, symbols, and version diffs against real artifacts. Free, no account.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
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 Inputs: ecosystem, name |
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. Hi Inputs: ecosystem, package, symbol, version |
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: Inputs: ecosystem, package, symbol, version |
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, re Inputs: ecosystem, package, from_version, to_version |
Every block below points at https://attester.dev/mcp/. Pick your client and copy.
claude mcp add --transport http attester-oracle https://attester.dev/mcp/
{
"mcpServers": {
"attester-oracle": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://attester.dev/mcp/"]
}
}
}{
"mcpServers": {
"attester-oracle": {
"url": "https://attester.dev/mcp/"
}
}
}{
"servers": {
"attester-oracle": {
"type": "http",
"url": "https://attester.dev/mcp/"
}
}
}{
"context_servers": {
"attester-oracle": {
"url": "https://attester.dev/mcp/"
}
}
}{
"mcpServers": {
"attester-oracle": {
"serverUrl": "https://attester.dev/mcp/"
}
}
}{
"mcpServers": {
"attester-oracle": {
"url": "https://attester.dev/mcp/"
}
}
}name: Attester Oracle
version: 0.0.1
schema: v1
mcpServers:
- name: Attester Oracle
type: streamable-http
url: https://attester.dev/mcp/{
"mcpServers": {
"attester-oracle": {
"httpUrl": "https://attester.dev/mcp/"
}
}
}{
"mcpServers": {
"attester-oracle": {
"type": "http",
"url": "https://attester.dev/mcp/"
}
}
}{
"mcpServers": {
"attester-oracle": {
"url": "https://attester.dev/mcp/"
}
}
}goose://extension?url=https%3A%2F%2Fattester.dev%2Fmcp%2F&type=streamable_http&id=attester-oracle&name=Attester%20Oracle
It answered our last check on 22 October 2026 in 4197 ms. Over 6 checks since 11 September 2026 it answered 4. Status here comes from Neuronto's own probes, not from the publisher.
4, as returned by the server's own tools/list on 15 September 2026: attester_package_exists, attester_symbol_exists, attester_symbol_signature, attester_version_diff.
It answered our last check on 22 October 2026 in 4197 ms. Over 6 checks since 11 September 2026 it answered 4.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://attester.dev/mcp/. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.maminihds. Endpoint host: attester.dev. ARD identifier: urn:air:io.github.maminihds:mcp:attester-mcp.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.