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 instructions/fastprod/contextengine/claude-mdgit clone --depth 1 https://github.com/FASTPROD/ContextEngineWhat 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 | $0.02702 | $0.02702 |
| Opus 5 | $0.01351 | $0.01351 |
| Sonnet 5 | $0.00540 | $0.00540 |
| Haiku 4.5 | $0.00270 | $0.00270 |
Grade B, and why
ContextEngine CLAUDE.md scanned grade B with 2 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 yesterday.
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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
| Claude Code MCP (global) | `~/.claude/settings.json` → `mcpServers.contextengine` → `npx @compr/opscontext-mcp` | same as above; applies to **every project on this machine** | Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
4. **All `exec()` calls must use hardcoded strings** — `agents.ts` and `collectors.ts` use `execSync` for git/docker/pm2 data collection. Never interpolate user input into shell commands. The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- yesterday First seen · 128 lines · 2,702 tokens per session scan B 33f5fbfab293
ContextEngine CLAUDE.md is an instructions file published in the GitHub repository FASTPROD/ContextEngine (3 stars, last pushed 2d ago), with no licence file. It adds 2,702 tokens to every session, about $0.0135 per session on Opus 5. A static security scan graded it B with 2 findings (reads agent configuration directories, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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