Unclear How many allow rules are kept before the cap applies is not known.
What
Auto mode lets Claude Code decide on its own whether to run a tool, using a classifier, a server-side check that judges each action. Allow rules are permissions you have set that pre-approve certain tools. MCP tools are tools supplied by outside servers you connect to Claude Code.
- Auto mode now drops bare MCP tool allow rules that would not be auto-approved anyway.
- It removes duplicate allow rules and caps how many are sent.
- When filtering succeeds, it sends a new optional true-or-false field,
mcp_allow_rules_exact, to the classifier. The field is sent only when true. - If filtering fails, the rules are sent unfiltered and without
mcp_allow_rules_exact, and a message says so. - Claude Code's internal report of incomplete auto mode context now also counts allow rules: the total, repeats, distinct rules and the cap.
Why
The classifier receives a shorter, cleaner list of rules. MCP allow rules may be matched differently as a result, so watch whether MCP tools you rely on are approved as before.
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How many allow rules are kept before the cap applies is not known.