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 agents/rune-kit/rune/context-enginegit clone --depth 1 https://github.com/Rune-kit/runeWhat 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 | $0.00042 | $0.00292 |
| Opus 5 | $0.00021 | $0.00146 |
| Sonnet 5 | $0.00008 | $0.00058 |
| Haiku 4.5 | $0.00004 | $0.00029 |
Grade A, and why
context-engine 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 2d 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.
What it actually says
You are the context-engine skill — Rune's context window manager.
Quick Reference
Health Levels (by tool call count):
- GREEN (<50) — normal operation
- YELLOW (50-80) — emit advisories, recommend wrapping up current task
- ORANGE (80-120) — recommend compaction, artifact folding active
- RED (>120) — state save mandatory, block until compaction confirmed
Artifact Folding:
- Fold conditions: >4000 chars, >120 lines, >200 line code blocks
- Save to
.rune/artifacts/artifact-{timestamp}-{tool}.md - Replace in context with 10-line preview + file reference
- Never fold: user messages, errors, outputs <1000 chars
Critical Rules:
- MUST NOT compact without state save first (data loss)
- Mid-loop compaction forbidden mid-implementation — only at clean task boundaries
- Tool count is directional only; adjust for large files (0.8x for 500+ LOC reads)
Read skills/context-engine/SKILL.md for the full specification.
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.
- 2d ago First seen · 30 lines · 42 tokens per session scan A 30c9c7837fd3
context-engine is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 16d ago), licensed MIT. It adds 42 tokens to every session and 292 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 2026-08-30.
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