Compression Strategy Skill for Claude

Compression Strategy

Analyze current context usage and recommend optimal compression strategies.

When To Use

• Context feels bloated or sluggish
• Before major task phase transitions (plan complete, starting implementation)
• Token quota burning faster than expected
• After large tool output accumulations

When NOT To Use

• Context-optimization skill already handling the scenario
• Simple queries with minimal context
• Freshly cleared context

Required TodoWrite Items

• compression-strategy:analyze-context
• compression-strategy:recommend-strategy
• compression-strategy:estimate-savings

Step 1 – Analyze Context (analyze-context)

Run /context to check current usage. Then estimate:

• Tool output accumulation: How much context is from tool results vs. conversation?
• Stale content age: How many turns since critical decisions were made?
• Active files: Which files are still relevant vs. historical?

Step 2 – Recommend Strategy (recommend-strategy)

Based on analysis, recommend one of:

Option A: /clear and /catchup

Best when:

• Task phase complete (planning done, implementation starting)
• Context > 60% full
• Most content is stale

Process:

• Save critical state to .claude/session-state.md
• Run /clear
• Run /catchup to reload active files

Option B: Spawn Continuation Agent

Best when:

• Context > 80% full
• Work in progress, can't stop
• Delegatable tasks remain

Process:

• Run Skill(conserve:clear-context) to spawn continuation agent
• Agent receives fresh context with saved state

Option C: Archive and Summarize

Best when:

• Context 40-60% full
• Some stale content mixed with active
• Not ready for full clear

Process:

• Archive old decisions/errors to .claude/context-archive/
• Summarize completed work in memory
• Continue with leaner context

Option D: Delegate to Subagent

Best when:

• Parallel work possible
• Independent subtasks exist
• Context pressure moderate

Process:

• Identify delegatable tasks
• Spawn specialized agents via Task tool
• Main context stays lean

Step 3 – Estimate Savings (estimate-savings)

For the recommended strategy, estimate:

| Strategy | Typical Savings | Risk |

|----------|-----------------|------|

| /clear and /catchup | 70-90% | Low if state saved |

| Continuation agent | 80-95% | Low, state preserved |

| Archive and summarize | 20-40% | Very low |

| Delegate to subagent | 30-50% | Low, parallel work |

| Reversible compression (CCR) | 47-92% per archived output | Low, original cached |

The CCR row is per oversized tool output, not whole-context: a large Bash,

Read, or Grep result is archived to a handle and replaced by a digest for

future turns. Savings are content-type-dependent (logs compress hard, prose

barely at all). See modules/reversible-compression.md.

Context Archive Location

Preserved context is saved to:

.claude/context-archive/pre-compact-YYYYMMDD-HHMMSS-SESSIONID.md

This is automatically created by the pre_compact_preserve hook before

any /compact operation.

Integration Points

• PreCompact hook: Automatically preserves context before compression
• Tool output summarizer: Warns when tool outputs accumulate
• Context warning hook: Three-tier alerts at 40%/50%/80%

Specialized Modules

Load modules/log-debugging-hygiene.md when the bloat source is

pasted log output (debug traces, CI failures, hook logs, JSONL).

That module documents a three-tier filter-first workflow with

benchmarked snippets and an honest framing of when compression

is and is not warranted. On the committed intake_queue.jsonl

fixture, tail -n 100 beats lossless compression by 25

percentage points; the module formalizes that asymmetry.

Load modules/reversible-compression.md when large tool outputs

(code search, log dumps, file reads) are the bloat source. That

module documents the CCR pattern: the tool_output_summarizer

hook archives any oversized output to a content-addressed handle

under .claude/context-archive/, and context_retrieve.py

fetches the original (or a slice) on demand, so the original

survives /clear without staying resident.

Example Usage

/compression-strategy

Output:

Context Analysis:
- Current usage: 52%
- Tool output: ~15KB (3 tool results)
- Stale content: ~40% (decisions from 8+ turns ago)

Recommendation: Option C - Archive + Summarize
- Archive old decisions to context-archive
- Keep active files and recent decisions
- Estimated savings: 25-35%

Commands:
1. Read .claude/context-archive/ to see what's preserved
2. Summarize completed work
3. Continue with leaner context

Exit Criteria

• [ ] Context analyzed: current usage and tool-output share estimated
• [ ] A single strategy recommended (A-D, or reversible compression) with a

stated reason

• [ ] Savings estimated with the named risk from the Step 3 table
• [ ] For large tool outputs, the CCR handle and context_retrieve.py

retrieval command are surfaced (not just a warning)

• [ ] Recommendation refused or downgraded when the bloat source is dense

prose (compresses by roughly nothing)