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 rules/cam-douglas/agent-instructions/00-read-agent-context-firstgit clone --depth 1 https://github.com/cam-douglas/agent-instructionsWrote 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/rules/cam-douglas/agent-instructions/00-read-agent-context-first)<a href="https://agentmods.dev/rules/cam-douglas/agent-instructions/00-read-agent-context-first"><img src="https://agentmods.dev/badge/rules/cam-douglas/agent-instructions/00-read-agent-context-first.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 | $0.00105 | $0.00105 |
| Opus 5 | $0.00053 | $0.00053 |
| Sonnet 5 | $0.00021 | $0.00021 |
| Haiku 4.5 | $0.00011 | $0.00011 |
Grade A, and why
00-read-agent-context-first 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 4d 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
On every new user message that requires substantive work, first read /AGENTS.md, then read its complete core per-turn set before any other tool or substantive response.
At the beginning of a new agent session, read /BOOTSTRAP.md and run the resolved /scripts/bootstrap.sh before project work.
Session-start reads do not satisfy later turns. A pure acknowledgment with no tools or project consequence is the only exception.
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.
- 4d ago First seen · 11 lines · 105 tokens per session scan A ad98ed5fcf7c
00-read-agent-context-first is a cursor rule published in the GitHub repository cam-douglas/agent-instructions (2 stars, last pushed 1mo ago), licensed MIT. It adds 105 tokens to every session, about $0.0005 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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