{"version":"2.1.321","anchor":"tool-pool-build-count-telemetry","canonical_anchor":"tool-pool-build-count-telemetry","heading":"Usage data now counts how often a session rebuilds its tool list","tier":"internal","area":"Telemetry","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.321\/e\/tool-pool-build-count-telemetry","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.321","markdown":"### Usage data now counts how often a session rebuilds its tool list\n\nClaude Code now reports how many times a session built its main list of tools, alongside its per-turn processor time\n\n**What**\n\nClaude Code sends usage data, called telemetry, back to Anthropic. That data can now include an optional field, `tool_pool_build_count`. It counts how many times a session built its main list of tools, which is the set of actions Claude Code can take. It is sent together with the measure of processor time spent on each turn.\n\n**Why**\n\nThis helps measure how much it costs when Claude Code rebuilds its tool list during a session.\n\n- Area: Telemetry\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}