Attester Oracle
Verify PyPI and npm packages, symbols, and version diffs against real artifacts. Free, no account.
Connect it
Settings → Connectors → Add custom connector
URL: https://attester.dev/mcp/Settings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://attester.dev/mcp/{
"mcpServers": {
"attester-mcp": {
"url": "https://attester.dev/mcp/"
}
}
}claude mcp add --transport http attester-mcp https://attester.dev/mcp/{
"servers": {
"attester-mcp": {
"type": "http",
"url": "https://attester.dev/mcp/"
}
}
}4 tools, pulled live
attester_package_existsread-onlyDoes 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_existsread-onlyDoes 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_signatureread-onlyExact 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_diffread-onlySymbol-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.
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