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 beel-collab/presets.dev --skill context-guardiangit clone --depth 1 https://github.com/beel-collab/presets.devWrote 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/beel-collab/presets.dev/context-guardian)<a href="https://agentmods.dev/skills/beel-collab/presets.dev/context-guardian"><img src="https://agentmods.dev/badge/skills/beel-collab/presets.dev/context-guardian/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/beel-collab/presets.dev/context-guardian"><img src="https://agentmods.dev/badge/skills/beel-collab/presets.dev/context-guardian.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 | $0.00032 | $0.03039 |
| Opus 5.5 | $0.00013 | $0.01216 |
| Sonnet 5.5 | $0.00006 | $0.00608 |
| Haiku 4.5 | $0.00003 | $0.00304 |
Grade A, and why
context-guardian 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 1mo 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 — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context Guardian
Overview
Guardiao de contexto que preserva dados criticos antes da compactacao automatica. Snapshots, verificacao de integridade e zero perda de informacao.
When to Use This Skill
- When the user mentions "compactacao contexto" or related topics
- When the user mentions "perda de contexto" or related topics
- When the user mentions "snapshot contexto" or related topics
- When the user mentions "preservar contexto" or related topics
- When the user mentions "contexto critico" or related topics
- When the user mentions "antes de compactar" or related topics
Do Not Use This Skill When
- The task is unrelated to context guardian
- A simpler, more specific tool can handle the request
- The user needs general-purpose assistance without domain expertise
How It Works
Sistema de integridade de contexto que protege projetos tecnicoss complexos contra
perda de informacao durante compactacao automatica do Claude Code. Enquanto o
context-agent atua APOS as sessoes (save/load), o context-guardian atua DURANTE
a sessao, detectando quando a compactacao esta proxima e executando protocolos de
preservacao com verificacao redundante.
Por Que Isto Existe
O Claude Code compacta automaticamente mensagens antigas quando o contexto se aproxima do limite da janela. Essa compactacao e heuristica — ela resume mensagens para liberar espaco, mas inevitavelmente perde detalhes. Para projetos simples, isso funciona bem. Mas para projetos tecnicos pesados (como ecossistemas com 21+ skills, auditorias de seguranca, refatoracoes de arquitetura), a perda de um unico detalhe pode causar regressoes, re-trabalho ou inconsistencias graves.
O context-guardian resolve isso criando uma camada de protecao PRE-compactacao: extrai, classifica, verifica e persiste todas as informacoes criticas ANTES que a compactacao automatica as destrua.
Localizacao
C:\Users\renat\skills\context-guardian\
├── SKILL.md # Este arquivo
├── references/
│ ├── extraction-protocol.md # Protocolo detalhado de extracao
│ └── verification-checklist.md # Checklist de verificacao e redundancia
└── scripts/
└── context_snapshot.py # Script de snapshot automatico
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.
- 1mo ago First seen · 315 lines · 32 tokens per session scan A 5e7be149382c
context-guardian is a skill published in the GitHub repository beel-collab/presets.dev (3 stars, last pushed 5mo ago), licensed MIT. It adds 32 tokens to every session and 3,039 once invoked, about $0.0001 per session on Opus 5.5. 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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