Phase-aware summarization and microcompaction for long sessions κΈ΄ μΈμ μ μν λ¨κ³ μΈμ μμ½ λ° λ§μ΄ν¬λ‘μ»΄ν©μ
Long coding sessions generate large conversation histories that eventually exceed the context window. ROACH PI uses a two-layer approach to context management:
κΈ΄ μ½λ© μΈμ μ κ²°κ΅ μ»¨ν μ€νΈ μλμ°λ₯Ό μ΄κ³Όνλ λν κΈ°λ‘μ μμ±ν©λλ€. ROACH PIλ 컨ν μ€νΈ κ΄λ¦¬λ₯Ό μν΄ λ κ³μΈ΅ μ κ·Ό λ°©μμ μ¬μ©ν©λλ€:
Phase-aware custom compaction takes over during active workflows. When the context window fills up, instead of using the default summarizer, ROACH PI injects a specialized compaction prompt that is tailored to the current workflow phase.
λ¨κ³ μΈμ 컀μ€ν μ»΄ν©μ μ΄ νμ± μν¬νλ‘ μ€μ μλν©λλ€. 컨ν μ€νΈ μλμ°κ° κ½ μ°¨λ©΄ κΈ°λ³Έ μμ½κΈ°λ₯Ό μ¬μ©νλ λμ , ROACH PIλ νμ¬ μν¬νλ‘ λ¨κ³μ λ§μΆ€νλ νΉμ μ»΄ν©μ ν둬ννΈλ₯Ό μ£Όμ ν©λλ€.
The prompt starts with a critical directive that prevents the model from making tool calls during compaction:
ν둬ννΈλ μ»΄ν©μ μ€ λͺ¨λΈμ΄ λꡬλ₯Ό νΈμΆνμ§ λͺ»νκ² νλ μ€μ μ§μλ¬ΈμΌλ‘ μμν©λλ€:
The model is required to produce two XML blocks in its response:
λͺ¨λΈμ μλ΅μ λ κ°μ XML λΈλ‘μ μμ±ν΄μΌ ν©λλ€:
<analysis> β Chronological thought process analyzing the conversationλνλ₯Ό λΆμνλ μμ°¨μ μ¬κ³ κ³Όμ <summary> β The structured summary in the prescribed 9-section formatκ·μ λ 9κ° μΉμ
νμμ ꡬ쑰νλ μμ½
After compaction, the <analysis> block is stripped and only the formatted summary is retained in context.
μ»΄ν©μ
ν <analysis> λΈλ‘μ μ κ±°λκ³ νμνλ μμ½λ§ 컨ν
μ€νΈμ μ μ§λ©λλ€.
Every compaction summary follows this nine-section structure. The model is given an explicit example template to follow.
λͺ¨λ μ»΄ν©μ μμ½μ μ΄ 9κ° μΉμ ꡬ쑰λ₯Ό λ°λ¦ λλ€. λͺ¨λΈμ λͺ μμ μΈ μμ ν νλ¦Ώμ μ 곡λ°μ΅λλ€.
Compaction is phase-aware. When an active workflow is running, the compaction prompt is augmented with phase-specific instructions that tell the model what to preserve.
μ»΄ν©μ μ λ¨κ³λ₯Ό μΈμν©λλ€. νμ± μν¬νλ‘κ° μ€ν μ€μΌ λ, μ»΄ν©μ ν둬ννΈλ λͺ¨λΈμ΄ 보쑴ν΄μΌ ν λ΄μ©μ μλ €μ£Όλ λ¨κ³λ³ μ§μλ¬ΈμΌλ‘ 보κ°λ©λλ€.
| Phaseλ¨κ³ | Whenμμ | Survives Compactionμ»΄ν©μ ν μ μ§ |
|---|---|---|
idle |
DefaultκΈ°λ³Έ | Yes (no special handling)μ (νΉλ³ν μ²λ¦¬ μμ) |
clarifying |
During /clarify/clarify μ€ |
Yes (phase preserved)μ (λ¨κ³ μ μ§) |
goal_drafting |
During Goal Contract draftingGoal Contract μμ± μ€ | Yes (phase + draft preserved)μ (λ¨κ³ + μ΄μ μ μ§) |
goal_active |
During /goal execution/goal μ€ν μ€ |
Yes (goal state preserved)μ (λͺ©ν μν μ μ§) |
reviewing |
During /review/review μ€ |
Yes (phase preserved)μ (λ¨κ³ μ μ§) |
Each non-idle phase injects additional instructions into the compaction prompt, emphasizing what the model must preserve. For example, during goal_active, the prompt requires the summary to capture active goal context, evidence, blockers, and current subgoal state.
κ° λΉμ ν΄(non-idle) λ¨κ³λ μ»΄ν©μ
ν둬ννΈμ μΆκ° μ§μλ¬Έμ μ£Όμ
νμ¬ λͺ¨λΈμ΄ 보쑴ν΄μΌ ν λ΄μ©μ κ°μ‘°ν©λλ€. μλ₯Ό λ€μ΄, goal_active μ€μλ ν둬ννΈκ° νμ± λͺ©ν 컨ν
μ€νΈ, μ¦κ±°, μ°¨λ¨ μμ, νμ¬ νμ λͺ©ν μνλ₯Ό ν¬ν¨νλλ‘ μꡬν©λλ€.
Microcompaction is a lightweight pre-compaction pass that replaces old tool results with short placeholders. This extends session lifetime by reducing token usage before a full compaction is triggered.
λ§μ΄ν¬λ‘μ»΄ν©μ μ μ€λλ λꡬ κ²°κ³Όλ₯Ό μ§§μ νλ μ΄μ€νλλ‘ κ΅μ²΄νλ κ²½λ μ¬μ μ»΄ν©μ ν¨μ€μ λλ€. μ 체 μ»΄ν©μ μ΄ νΈλ¦¬κ±°λκΈ° μ μ ν ν° μ¬μ©λμ μ€μ¬ μΈμ μλͺ μ μ°μ₯ν©λλ€.
A message is eligible for microcompaction when all of these conditions are met:
λ©μμ§λ λ€μ λͺ¨λ μ‘°κ±΄μ΄ μΆ©μ‘±λ λ λ§μ΄ν¬λ‘μ»΄ν©μ λμμ΄ λ©λλ€:
role === "toolResult"isError !== true (error results are never compacted)(μ€λ₯ κ²°κ³Όλ μ λ μ»΄ν©μ
λμ§ μμ)toolName is inμ΄ PI_TOOL_NAME_SET (known pi tools only)(μλ €μ§ pi λꡬλ§)MICROCOMPACT_AGE_MS (1 hour)(1μκ°)When compacted, the tool result content is replaced with:
μ»΄ν©μ λλ©΄ λꡬ κ²°κ³Ό μ½ν μΈ κ° λ€μμΌλ‘ κ΅μ²΄λ©λλ€:
Microcompaction is opt-in. It must be explicitly enabled via environment variable.
λ§μ΄ν¬λ‘μ»΄ν©μ μ μ΅νΈμΈμ λλ€. νκ²½ λ³μλ₯Ό ν΅ν΄ λͺ μμ μΌλ‘ νμ±νν΄μΌ ν©λλ€.
| Env Varνκ²½ λ³μ | DefaultκΈ°λ³Έκ° | Descriptionμ€λͺ |
|---|---|---|
PI_AGENTIC_MICROCOMPACTION |
(unset)(λ―Έμ€μ ) | Set to 1 to enable microcompaction1λ‘ μ€μ μ λ§μ΄ν¬λ‘μ»΄ν©μ
νμ±ν |
During durable goal execution, the active goal, current subgoal, evidence ledger, and verifier receipts are critical for continuity. If a compaction occurs mid-execution:
μ§μν λͺ©ν μ€ν μ€μλ νμ± λͺ©ν, νμ¬ νμ λͺ©ν, μ¦κ±° μμ₯, κ²μ¦ μμμ¦μ΄ μ°μμ±μ μ€μν©λλ€. μ€ν μ€ μ»΄ν©μ μ΄ λ°μνλ©΄:
This means durable goal execution will not lose track of its active goal, blockers, verifier status, or phase even if multiple compactions occur.
μ¦, durable goal μ€ν μ€ μ¬λ¬ μ»΄ν©μ μ΄ λ°μν΄λ νμ± λͺ©ν, μ°¨λ¨ μμ, κ²μ¦ μν, λ¨κ³λ₯Ό μμ§ μμ΅λλ€.