Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/ils15/pantheon-legacy/context-compressionnpx skills add ils15/pantheon-legacy --skill context-compressiongit clone --depth 1 https://github.com/ils15/pantheon-legacyWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ils15/pantheon-legacy/context-compression)<a href="https://agentmods.dev/skills/ils15/pantheon-legacy/context-compression"><img src="https://agentmods.dev/badge/skills/ils15/pantheon-legacy/context-compression.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00032 | $0.10159 |
| Opus 5 | $0.00016 | $0.05079 |
| Sonnet 5 | $0.00006 | $0.02032 |
| Haiku 4.5 | $0.00003 | $0.01016 |
Grade A, and why
context-compression scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 862 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context Compression — Level 2 (Intelligent Compression)
Level 2 replaces Level 1 with priority-aware compression: scoring, semantic summarization for critical/high entries, downstream-aware field masks, budget allocation, and automatic cross-references. Zeus triggers, Mnemosyne executes.
1. Overview
Level 2 adds four capabilities beyond Level 1:
- Priority Scoring Engine — Deterministic keyword-driven scoring (no LLM) for each subtask_summary across 5 dimensions. Outputs CRITICAL/HIGH/MEDIUM/LOW.
- Semantic Summarization — Template-generated contextual summaries for CRITICAL/HIGH entries, tailored to the downstream agent pair. MEDIUM/LOW get standard mechanical 1-line compression.
- Downstream-Aware Compression — Field masks preserve the most relevant fields per (from_agent, to_agent) pair. Themis gets all fields; Mnemosyne gets minimal.
- Cross-Reference Mechanism — Auto-generated
_xref/index.mdwith entity references for endpoints, tables, migrations, components, and decisions, surviving sprint boundaries.
Budget allocation is priority-greedy. CRITICAL entries are always expanded. Overflow escalates to Zeus.
2. Compression Triggers
Same 7 triggers as Level 1, with Level 2 behavior:
| Trigger | Fires | Level 2 Behavior |
|---|---|---|
| C1 Phase Gate | Themis APPROVED | Priority-score subtask_summary → semantic summary (CRITICAL/HIGH) or 1-line (MEDIUM/LOW) → 01-active-context.md |
| C2 Phase Gate | Themis APPROVED | IMPL artifact → scored, archived to 02-progress-log.md; .tmp/ deleted |
| C3 Phase Gate | Themis APPROVED | REVIEW summary line → 02-progress-log.md; .tmp/ deleted |
| C4 Feature Complete | Last phase APPROVED | PLAN reference → 01-active-context.md; .tmp/ deleted |
| C5 Sprint Close | @mnemosyne Close sprint |
Bulk cleanup + cross-ref archive + flag unresolved |
| C6 Explicit | /compress |
Per-type compression with priority scoring |
| C7 Size-based | 01-active-context.md Completed Phases > 100 lines |
Priority-greedy trim: oldest LOW entries first, preserving CRITICAL and HIGH |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 862 lines · 32 tokens per session scan A 07cfddfedeb8
context-compression is a skill published in the GitHub repository ils15/pantheon-legacy (10 stars, last pushed 3d ago), licensed MIT. It adds 32 tokens to every session and 10,159 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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