Developer Tools

attester.dev

Provides tools for verifying package and symbol existence, signatures, and version diffs in PyPI and npm packages.

x402 supported1 endpoint4 known toolsFirst detected July 26, 2026Last detected July 29, 2026

ENDPOINT 1

https://attester.dev/mcp

No auth detected

MCP server metadata

Name: attester-oracle
Version: 3.4.4

Capabilities

experimentalloggingprompts.listChangedresources.listChangedtools.listChangedextensions.io.modelcontextprotocol/ui

Server instructions

Deterministic API-existence oracle: does a package or symbol really exist on PyPI or npm, answered from real published artifacts with signed proof. 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.

Known tools 4

attester_package_exists

Does this PyPI or npm package name really exist?

Inferred read-only

attester_symbol_exists

Does a function, class, or constant exist in this PyPI or npm package?

Inferred read-only

attester_symbol_signature

Exact signature, structured params, docstring summary, and deprecation status for one symbol, resolved at a pinned version when given.

Inferred read-only

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.

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.attester-oracle]
url = "https://attester.dev/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "attester-oracle": {
      "type": "http",
      "url": "https://attester.dev/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: attester-oracle
Remote MCP URL: https://attester.dev/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "attester-oracle": {
      "url": "https://attester.dev/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "attester-oracle": {
      "type": "http",
      "url": "https://attester.dev/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "attester-oracle",
  "transport": "streamable-http",
  "url": "https://attester.dev/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Trust Data Available

BuiltWith Trust API v2 evidence for attester.dev was fetched 2026-07-31T00:17:43.617Z.

Trust status Neutral

attester.dev is assessed as Neutral: No suspicious signals found, but no strong positive signal either

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.