reef

reef is a skill for Claude Code from kangig94/coral. It costs 17 tokens per session (1,165 once invoked), scanned A, original, MIT.

An archived dashboard-launching skill for the Coral Reef project. It is no longer exposed as a live skill, though its instructions describe installing, building, and starting the dashboard.

In plain words
What is it for?
Use it as reference when re-enabling or maintaining Coral Reef, including its installation process, project paths, data directory, and port setting.
Why use it?
It mainly documents a paused tool and the changes needed before it could be enabled again. Using it as an active feature may not work because it is archived and has known configuration limitations.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: reads .claude/ paths; mentions Claude Code.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is PLUGIN_ROOT = resolve(base_directory, "../..").

Good fit Use it as reference when re-enabling or maintaining Coral Reef, including its installation process, project paths, data directory, and port setting.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/kangig94/coral
agentmods
npx agentmods add skills/kangig94/coral/reef

Made for: Claude Code.

Wrote 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.

agentmods badge for reef

README.md
[![agentmods](https://agentmods.dev/badge/skills/kangig94/coral/reef/github.svg)](https://agentmods.dev/skills/kangig94/coral/reef)
Your own site
<a href="https://agentmods.dev/skills/kangig94/coral/reef"><img src="https://agentmods.dev/badge/skills/kangig94/coral/reef/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.

agentmods 80×15 button for reef

Your own site · 80×15
<a href="https://agentmods.dev/skills/kangig94/coral/reef"><img src="https://agentmods.dev/badge/skills/kangig94/coral/reef.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,165 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Rogue Agent · line 45
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00017 $0.01165
Opus 5.5 $0.00007 $0.00466
Sonnet 5.5 $0.00003 $0.00233
Haiku 4.5 $0.00002 $0.00117

Measured 2mo ago against content hash 1515432ab7b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

reef scanned grade A with 1 finding 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 2mo 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s http://localhost:3100/api/system/health
_archived/reef/SKILL.md · 136 lines

How it starts

The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Coral Reef Dashboard

ARCHIVED — not a live skill. Moved out of skills/ so it is not discovered or exposed to users (Claude Code recursively registers every skills/<name>/SKILL.md; there is no frontmatter/naming flag to hide one in place). coral-reef development is paused. To re-enable: move this directory back to skills/reef/. Note the data dir (~/.claude/coral-reef/) still hardcodes ~/.claude and does not yet honor CLAUDE_CONFIG_DIR — fix that in the coral-reef server repo before re-enabling.

Launch the coral-reef dashboard. Handles installation, updates, builds, and startup automatically.

The runtime injects Base directory for this skill: which resolves to this skill's installed path. From there, the plugin root is two levels up, and coral-reef/ sits as a sibling directory.

Constants

REPO_URL = "https://github.com/kangig94/coral-reef"
REEF_DATA_DIR = ~/.claude/coral-reef/
REEF_PORT = 3100

Protocol

Step 1 — Resolve Paths

Derive the plugin root from the base directory injected by the framework:

PLUGIN_ROOT = resolve(base_directory, "../..")
REEF_DIR = resolve(PLUGIN_ROOT, "coral-reef")

Verify PLUGIN_ROOT contains package.json with "name": "coral" as a sanity check.

Step 2 — Ensure Data Directory

mkdir -p ~/.claude/coral-reef

This is coral-reef's permanent SQLite storage location, surviving /tmp reboots.

Step 3 — Clone or Update

Check if REEF_DIR exists:

  • Not exists: git clone ${REPO_URL} ${REEF_DIR}
  • Exists with .git/: cd ${REEF_DIR} && git pull --ff-only
  • Exists without .git/: warn user and skip update (manual install)

Step 4 — Dependency Resolution

Detect the install layout by checking if this is a nested plugin install or a dev workspace:

# Read coral-reef's package.json
cd ${REEF_DIR}

Check if the coral dependency in package.json points to the correct location:

  • Dev workspace layout (~/workspace/coral-reef sibling to ~/workspace/coral): The coral dependency should be "file:../coral". Leave as-is.

Read the full file on GitHub · 136 lines

Changes

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.

  1. 2mo ago First seen · 136 lines · 17 tokens per session scan A 1515432ab7b6

Subscribe to this mod's changes

reef is a skill published in the GitHub repository kangig94/coral (11 stars, last pushed yesterday), licensed MIT. It adds 17 tokens to every session and 1,165 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

reef compared with skills from other repositories

reef next to 6 skills from other repositories
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