{"name":"appendSystemPrompt","slug":"appendsystemprompt","family":"setting","title":"Settings keys","noun":"settings key","description":"Forked background sessions are told to stay in their own worktree and never touch the original session's branch.","description_source":"entry","described_by":{"version":"2.1.221","anchor":"forked-background-sessions-get-clearer-worktree-guidance"},"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.308","builds":0,"mined_builds":149,"first_cited":{"version":"2.0.71","released_at":"2025-12-16 21:30:39","spans":4}},"aliases":[],"entries":[{"version":"2.1.269","anchor":"sessiontool-use-context-object-grows-a-large-set-of-new-acc","heading":"Session\/tool-use context object grows a large set of new accessors","line":"The internal per-session context object gained many new fields covering effort, hooks, tools, and skills","released_at":"2026-09-11 18:12:49","reason":"found in this entry's text"},{"version":"2.1.260","anchor":"get-context-usage-no-longer-factors-in-appendsubagentsystemp","heading":"get_context_usage no longer factors in appendSubagentSystemPrompt","line":"Context-usage estimates for embedding hosts no longer count the subagent system-prompt append.","released_at":"2026-09-03 22:32:02","reason":"found in this entry's text"},{"version":"2.1.257","anchor":"systempromptsnapshot-option-for-records-the-system-prompt-on","heading":"systemPromptSnapshot option for records the system prompt once per conversation","line":"A systemPromptSnapshot option freezes the system prompt for a conversation, so mid-session changes wait for compaction.","released_at":"2026-09-01 17:15:33","reason":"found in this entry's text, named in this entry"},{"version":"2.1.257","anchor":"new-system-prompt-snapshot-plumbed-into-mcptool-context","heading":"New system prompt snapshot plumbed into MCP\/tool context","line":"The tool and agent context now exposes a snapshot of the system prompt in effect alongside the appended one.","released_at":"2026-09-01 17:15:33","reason":"found in this entry's text"},{"version":"2.1.252","anchor":"new-appendsubagentsystemprompt-option-threaded-through-sessi","heading":"New appendSubagentSystemPrompt option threaded through session\/agent config","line":"A new appendSubagentSystemPrompt option lets a subagent's system-prompt append differ from the main session's.","released_at":"2026-08-31 17:07:28","reason":"found in this entry's text"},{"version":"2.1.252","anchor":"appendsubagentsystemprompt-threaded-into-more-system-prompt","heading":"appendSubagentSystemPrompt threaded into more system-prompt construction call sites","line":"Internal plumbing now threads a subagent-specific system prompt option through more call sites.","released_at":"2026-08-31 17:07:28","reason":"found in this entry's text"},{"version":"2.1.242","anchor":"command-line-system-prompts-kept-separate-from-resolved-ones","heading":"Command-line system prompts kept separate from resolved ones","line":"Your typed --system-prompt values are kept apart from the resolved ones for cloud and remote setup.","released_at":"2026-08-24 19:16:14","reason":"found in this entry's text"},{"version":"2.1.225","anchor":"sdk-query-context-construction-was-consolidated","heading":"SDK query context construction was consolidated","line":"The non-interactive query path builds its context in one shared place, meant to behave identically.","released_at":"2026-08-07 23:08:56","reason":"found in this entry's text"},{"version":"2.1.221","anchor":"forked-background-sessions-get-clearer-worktree-guidance","heading":"Forked background sessions get clearer worktree guidance","line":"Forked background sessions are told to stay in their own worktree and never touch the original session's branch.","released_at":"2026-08-03 22:16:25","reason":"named in this entry, found in this entry's text"},{"version":"2.1.136","anchor":"enterprise-managed-settings-helper","heading":"Enterprise Managed Settings Helper","line":null,"released_at":"2026-05-08 16:30:41","reason":"found in this entry's text"}],"entries_total":12,"docs":[{"source":"claude-code","path":"agent-sdk\/typescript","title":"Agent SDK reference - TypeScript","documented":false}],"docs_total":1,"gates":[],"related":[],"url":"https:\/\/changelogs.core-directive.com\/reference\/setting\/appendsystemprompt","family_url":"https:\/\/changelogs.core-directive.com\/reference\/setting.json"}