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fix(agent): stop resume hydration from overfilling the context window #3331

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Merged
tatoalo merged 3 commits into from
Jul 10, 2026
Merged

fix(agent): stop resume hydration from overfilling the context window #3331

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fix(agent): stop resume hydration from overfilling the context window
tatoalo Jul 10, 2026
f4a81d2
chore(agent): trim hydration budget comments
tatoalo Jul 10, 2026
ec17957
chore(agent): state budget rationale independent of usage seeding
tatoalo Jul 10, 2026
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9 changes: 6 additions & 3 deletions packages/agent/src/adapters/claude/session/jsonl-hydration.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -241,9 +241,12 @@ export function rebuildConversation(
return turns;
}

const CHARS_PER_TOKEN = 4;
const DEFAULT_MAX_TOKENS = 150_000;
const LARGE_CONTEXT_MAX_TOKENS = 800_000;
// JSON-heavy tool payloads tokenize at ~2.5-3 chars/token, so estimate low.
const CHARS_PER_TOKEN = 3;
// Target ~half the context window, leaving headroom for the system prompt,
// tools, skills, estimation error, and the resumed run's own work.
const DEFAULT_MAX_TOKENS = 80_000;
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const LARGE_CONTEXT_MAX_TOKENS = 400_000;

function estimateTurnTokens(turn: ConversationTurn): number {
let chars = 0;
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