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 skills add Katagiri-Hoshino-Lab/VibeCodeHPC --skill context-monitorgit clone --depth 1 https://github.com/Katagiri-Hoshino-Lab/VibeCodeHPCWrote 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/katagiri-hoshino-lab/vibecodehpc/context-monitor)<a href="https://agentmods.dev/skills/katagiri-hoshino-lab/vibecodehpc/context-monitor"><img src="https://agentmods.dev/badge/skills/katagiri-hoshino-lab/vibecodehpc/context-monitor/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/katagiri-hoshino-lab/vibecodehpc/context-monitor"><img src="https://agentmods.dev/badge/skills/katagiri-hoshino-lab/vibecodehpc/context-monitor.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00031 | $0.00449 |
| Opus 5 | $0.00015 | $0.00225 |
| Sonnet 5 | $0.00006 | $0.00090 |
| Haiku 4.5 | $0.00003 | $0.00045 |
Grade A, and why
context-monitor 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 12d 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
Context Monitor
Thresholds
| Level | Action |
|---|---|
| < 70% | Normal operation |
| 70-85% | Persist current state to files, update task list |
| 85-95% | Save intermediate results, minimize new file reads |
| ~95% | Auto-compact triggers — context will be compressed |
Note: The thresholds above are behavioral guidelines for agents. The
context_monitor.pyscript useswarning_threshold(70%) andauto_compact_threshold(95%) for visualization and alerting. The 85% intermediate action is the agent's own responsibility.
Pre-Compact Checklist
- Write work state summary to file (SOTA values, current version, next action)
- Update ChangeLog.md with latest results
- List reference file paths for post-compact recovery
Post-Compact Recovery
- Read task file / ChangeLog.md
- Restore minimal working context
- Resume from interruption point
CLI Script
python3 ${CLAUDE_SKILL_DIR}/scripts/context_monitor.py --help
python3 ${CLAUDE_SKILL_DIR}/scripts/context_monitor.py claude --find-latest --status
python3 ${CLAUDE_SKILL_DIR}/scripts/context_monitor.py codex --find-latest --status --json
python3 ${CLAUDE_SKILL_DIR}/scripts/context_monitor.py gemini /path/to/telemetry.jsonl --visualize -o ./viz
python3 ${CLAUDE_SKILL_DIR}/scripts/context_monitor.py claude /path/to/session.jsonl --visualize --context-limit 200000
Supported parsers: claude, codex, gemini, opencode
Multi-Agent Considerations
- Delegate large tasks to sub-agents to distribute context load
- SE/PM should monitor agent context consumption trends
- Use
PG_visible_dir.mdto limit unnecessary file reads
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 12d ago First seen · 48 lines · 31 tokens per session scan A 3e5498cc0949
context-monitor is a skill published in the GitHub repository Katagiri-Hoshino-Lab/VibeCodeHPC (39 stars, last pushed 5mo ago), licensed MIT. It adds 31 tokens to every session and 449 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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