{"version":"2.1.323","anchor":"the-agent-tool-description-in-the-compaction-prompt-was-rewr","canonical_anchor":"the-agent-tool-description-in-the-compaction-prompt-was-rewr","heading":"Subagent instructions used while summarising now say \"messages from the system\"","tier":"internal","area":"Compaction","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323\/e\/the-agent-tool-description-in-the-compaction-prompt-was-rewr","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.323","markdown":"### Subagent instructions used while summarising now say \"messages from the system\"\n\nIn the compaction prompt, the Agent tool says available agent types are listed in messages from the system\n\n**What**\n\nThe Agent tool lets Claude hand a task to a subagent, a separate helper copy of Claude. When a conversation grows too long, Claude Code compacts it, which means summarising earlier parts to free up space. The prompt used for that step carries its own copy of the Agent tool's description.\n\nThat copy now says the available agent types are listed in \"messages from the system\" in the conversation, instead of in \"system-reminder\" messages.\n\n**Why**\n\nChanging Claude's instructions can change how it behaves. Here only the name for where the agent types are listed changed.\n\n- Area: Compaction\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 0\/5\n- Scope: individual\n- Heads-up: no"}