{"name":"CLAUDE_CODE_CLIENT_KEY","slug":"claude-code-client-key","family":"env","title":"Environment variables","noun":"environment variable","description":"Path to client private key file for mTLS authentication","description_source":"docs","described_by":{"doc":"claude-code\/env-vars","title":"Environment variables"},"presence":{"first_seen":"2.1.138","removed_in":null,"in_current_build":true,"newest_mined":"2.1.309","builds":150,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.232","anchor":"mismatched-mtls-client-certificate-and-key-are-ignored-inste","heading":"Mismatched mTLS client certificate and key are ignored instead of installed","line":"A mismatched client certificate and key pair is now ignored and logged instead of installed.","released_at":"2026-08-13 21:30:53","reason":"named in this entry, found in this entry's text"},{"version":"2.1.200","anchor":"mtls-certificate-hot-reload","heading":"mTLS Certificate Hot-Reload","line":null,"released_at":"2026-07-03 04:33:49","reason":"found in this entry's text"},{"version":"1.0.36","anchor":"mtls-mutual-tls-support","heading":"mTLS (Mutual TLS) Support","line":null,"released_at":"2025-06-27 17:07:11","reason":"found in this entry's text"}],"entries_total":3,"docs":[{"source":"claude-code","path":"env-vars","title":"Environment variables","documented":true},{"source":"claude-code","path":"monitoring-usage","title":"Monitoring","documented":false},{"source":"claude-code","path":"network-config","title":"Enterprise network configuration","documented":false},{"source":"claude-code","path":"server-managed-settings","title":"Configure server-managed settings","documented":false}],"docs_total":4,"gates":[],"related":[{"name":"CLAUDE_CODE_CLIENT_CERT","slug":"claude-code-client-cert","description":"Path to client certificate file for mTLS authentication"},{"name":"CLAUDE_CODE_CLIENT_DATA_URL","slug":"claude-code-client-data-url","description":"`--client-data-url` or `CLAUDE_CODE_CLIENT_DATA_URL` loads a signed per-model configuration from Anthropic, and Claude Code will not start if it fails"},{"name":"CLAUDE_CODE_CLIENT_KEY_PASSPHRASE","slug":"claude-code-client-key-passphrase","description":"Passphrase for encrypted CLAUDE\\_CODE\\_CLIENT\\_KEY (optional)"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/claude-code-client-key","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}