Teknium e75f58420c feat(compressor): major context compaction improvements ...

Six improvements to reduce information loss during context compression,
informed by analysis of Cline, OpenCode, Pi-mono, Codex, and ClawdBot:

1. Structured summary template — sections for Goal, Progress (Done/
   In Progress/Blocked), Key Decisions, Relevant Files, Next Steps,
   and Critical Context. Forces the summarizer to preserve each
   category instead of writing a vague paragraph.

2. Iterative summary updates — on re-compression, the prompt says
   'PRESERVE existing info, ADD new progress, UPDATE done/in-progress
   status.' Previous summary is stored and fed back to the summarizer
   so accumulated context survives across multiple compactions.

3. Token-budget tail protection — instead of fixed protect_last_n=4,
   walks backward keeping ~20K tokens of recent context. Adapts to
   message density: sessions with big tool results protect fewer
   messages, short exchanges protect more. Falls back to protect_last_n
   for small conversations.

4. Tool output pruning (pre-pass) — before the expensive LLM summary,
   replaces old tool result contents with a placeholder. This is free
   (no LLM call) and can save 30%+ of context by itself.

5. Scaled summary budget — instead of fixed 2500 tokens, allocates 20%
   of compressed content tokens (clamped to 2000-8000). A 50-turn
   conversation gets more summary space than a 10-turn one.

6. Richer summarizer input — tool calls now include arguments (up to
   500 chars) and tool results keep up to 3000 chars (was 1500).
   The summarizer sees 'terminal(git status) → M src/config.py'
   instead of just '[Tool calls: terminal]'.

2026-03-21 08:14:14 -07:00

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