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Heartbeat: add isolatedSession option for fresh session per heartbeat run (#46634)

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Reuses the cron isolated session pattern (resolveCronSession with forceNew)
to give each heartbeat a fresh session with no prior conversation history.
Reduces per-heartbeat token cost from ~100K to ~2-5K tokens.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
George Zhang
2026-03-14 16:28:01 -07:00
committed by GitHub
parent 9e8df16732
commit 2806f2b878
9 changed files with 148 additions and 13 deletions
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7
src/config/types.agent-defaults.ts
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@@ -253,6 +253,13 @@ export type AgentDefaultsConfig = {
* Lightweight mode keeps only HEARTBEAT.md from workspace bootstrap files.
*/
lightContext?: boolean;
/**
* If true, run heartbeat turns in an isolated session with no prior
* conversation history. The heartbeat only sees its bootstrap context
* (HEARTBEAT.md when lightContext is also enabled). Dramatically reduces
* per-heartbeat token cost by avoiding the full session transcript.
*/
isolatedSession?: boolean;
/**
* When enabled, deliver the model's reasoning payload for heartbeat runs (when available)
* as a separate message prefixed with `Reasoning:` (same as `/reasoning on`).