{"version":"2.1.323","anchor":"tools-used-header-is-now-capped-and-reports-truncation","canonical_anchor":"tools-used-header-is-now-capped-and-reports-truncation","heading":"The list of used tools sent with requests is now capped","tier":"internal","area":"API Requests","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323\/e\/tools-used-header-is-now-capped-and-reports-truncation","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323","markdown":"### The list of used tools sent with requests is now capped\n\nClaude Code now limits how many tool names it sends in its tools-used request header and records how many it dropped\n\n**What**\n\nWith each request, Claude Code sends a header listing the tools that have been used. A header is a small piece of extra information attached to the request. Claude Code now builds this list, measures it, and drops names past a limit. When it drops names, it records how many names were sent and how many were left out.\n\nBefore, the list was sent in full with no limit.\n\n**Why**\n\nThe header can no longer grow without bound, even in sessions that use many tools.\n\n- Area: API Requests\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}