AGENTS.md

1# src/hooks/anthropic-context-window-limit-recovery/ (Multi-Strategy Context Recovery)
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3**Generated:** 2026-05-15
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5## OVERVIEW
6 
731 files (~2232 LOC). Most complex hook. Recovers from context window limit errors via multiple strategies applied in sequence.
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9## RECOVERY STRATEGIES (in priority order)
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11| Strategy | File | Mechanism |
12|----------|------|-----------|
13| **Empty content recovery** | `empty-content-recovery.ts` | Handle empty/null content blocks in messages |
14| **Deduplication** | `deduplication-recovery.ts` | Remove duplicate tool results from context |
15| **Target-token truncation** | `target-token-truncation.ts` | Truncate largest tool outputs to fit target ratio |
16| **Aggressive truncation** | `aggressive-truncation-strategy.ts` | Last-resort truncation with minimal output preservation |
17| **Summarize retry** | `summarize-retry-strategy.ts` | Compaction + summarization then retry |
18 
19## KEY FILES
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21| File | Purpose |
22|------|---------|
23| `recovery-hook.ts` | Main hook entry: `session.error` handler, strategy orchestration |
24| `executor.ts` | Execute recovery strategies in sequence |
25| `parser.ts` | Parse Anthropic token limit error messages |
26| `state.ts` | `AutoCompactState`: per-session retry/truncation tracking |
27| `types.ts` | `ParsedTokenLimitError`, `RetryState`, `TruncateState`, config constants |
28| `storage.ts` | Persist tool results for later truncation |
29| `tool-result-storage.ts` | Store/retrieve individual tool call results |
30| `message-builder.ts` | Build retry messages after recovery |
31 
32## RETRY CONFIG
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34- Max attempts: 2
35- Initial delay: 2s, backoff ×2, max 30s
36- Max truncation attempts: 20
37- Target token ratio: 0.5 (truncate to 50% of limit)
38- Chars per token estimate: 4
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40## PRUNING SYSTEM
41 
42`pruning-*.ts` files handle intelligent output pruning:
43- `pruning-deduplication.ts`: Remove duplicate content across tool results
44- `pruning-tool-output-truncation.ts`: Truncate oversized tool outputs
45- `pruning-types.ts`: Pruning-specific type definitions
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47## SDK VARIANTS
48 
49`empty-content-recovery-sdk.ts` and `tool-result-storage-sdk.ts` provide SDK-based implementations for OpenCode client interactions.
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