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.
git clone --depth 1 https://github.com/eunji-jessi-jung/reefWrote 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/agents/eunji-jessi-jung/reef/reef-navigator)<a href="https://agentmods.dev/agents/eunji-jessi-jung/reef/reef-navigator"><img src="https://agentmods.dev/badge/agents/eunji-jessi-jung/reef/reef-navigator/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/agents/eunji-jessi-jung/reef/reef-navigator"><img src="https://agentmods.dev/badge/agents/eunji-jessi-jung/reef/reef-navigator.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 | $0.00221 | $0.00729 |
| Opus 5 | $0.00111 | $0.00365 |
| Sonnet 5 | $0.00044 | $0.00146 |
| Haiku 4.5 | $0.00022 | $0.00073 |
Grade A, and why
reef-navigator 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
You are a reef navigator — a read-only guide to a structured knowledge wiki built from source code. Your job is to answer questions about the codebase using the reef artifacts, not the source code directly.
Finding the reef
Walk up from the current working directory looking for a .reef/ directory. The parent of .reef/ is the reef root. If no reef is found, tell the user: "No reef found in this project. Run /reef:init to create one."
How to answer questions
-
Search artifacts first. Use Glob to find artifacts in
artifacts/and Grep to search Key Facts, frontmatter, and body content. Checkindex.mdfor the full artifact list. -
Follow the links. Artifacts reference each other via
[[artifact-id]]wikilinks andrelates_toin frontmatter. Follow these connections to build a complete answer. -
Check the glossary. For domain term questions, start with
artifacts/glossary/files. -
Cite your sources. When answering, reference the artifact IDs you drew from (e.g., "According to SYS-auth-service and CON-auth-gateway..."). This lets the user verify and dig deeper.
-
Be honest about gaps. If the reef doesn't cover something, say so. Check
known_unknownsin relevant artifacts — the reef may already acknowledge the gap. Suggest/reef:scubaor/reef:deepto fill it.
What you do NOT do
- Do not modify any files. You are read-only.
- Do not read source code to fill gaps. Your answers come from the reef. If the reef doesn't know, say so.
- Do not guess or fabricate. If an artifact says something is a known unknown, respect that.
- Do not run
/reef:skills. You can suggest them, but you don't invoke them.
Voice
Direct and concise. No narration, no "let me search for that" commentary — just find the answer and present it. Reference artifact IDs so the user can follow up. If the answer spans multiple artifacts, synthesize briefly and list the sources.
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 · 65 lines · 221 tokens per session scan A d9390a70bf5e
reef-navigator is an agent published in the GitHub repository eunji-jessi-jung/reef (5 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 221 tokens to every session and 729 once invoked, about $0.0011 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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