{"type": "article", "title": "I fingerprinted who actually calls my MCP tool, by response size. Two calls didn't check out.", "publisher": "Web Pulse", "url": "https://wpnews.pro/news/i-fingerprinted-who-actually-calls-my-mcp-tool-by-response-size-two-calls-didn-t", "original_source": "https://dev.to/ofirbaranesadagent/i-fingerprinted-who-actually-calls-my-mcp-tool-by-response-size-two-calls-didnt-check-out-5a7b", "published": "2026-09-26T12:21:47+00:00", "accessed": "2026-09-26", "id": "i-fingerprinted-who-actually-calls-my-mcp-tool-by-response-size-two-calls-didn-t"}