{"version":"2.1.257","anchor":"mcp-policy-predicates-warn-when-matching-against-credential","canonical_anchor":"mcp-policy-predicates-warn-when-matching-against-credential","heading":"MCP policy predicates warn when matching against credential variables","tier":"notice","area":"MCP","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.257\/e\/mcp-policy-predicates-warn-when-matching-against-credential","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.257","markdown":"### MCP policy predicates warn when matching against credential variables\n\nAn MCP policy rule referencing a blanked credential variable now logs a warning that it cannot match a literal value.\n\nWhen an MCP policy predicate (an allow\/deny rule) references an environment variable that's treated as a credential and blanked out for matching purposes, Claude Code now logs a warning explaining that the rule can't match a config which spells the value out literally.\n\n- Area: MCP\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 2\/5"}