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 voxel51/fiftyone-skills --skill fiftyone-develop-plugingit clone --depth 1 https://github.com/voxel51/fiftyone-skillsWrote 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/voxel51/fiftyone-skills/fiftyone-develop-plugin)<a href="https://agentmods.dev/skills/voxel51/fiftyone-skills/fiftyone-develop-plugin"><img src="https://agentmods.dev/badge/skills/voxel51/fiftyone-skills/fiftyone-develop-plugin.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 5 findings, up to high
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 →
- high YARA Match · line 47 YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
- high Anti-Refusal · line 182 Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.
- high Supply Chain · line 376 Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.Fix: Avoid downloading and executing remote scripts. Use trusted packages from PyPI/npm. If remote fetch is required, verify checksums and use HTTPS.
- medium MCP Rug Pull · line 120 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium Data Exfiltration · line 376 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00042 | $0.03920 |
| Opus 5 | $0.00021 | $0.01960 |
| Sonnet 5 | $0.00008 | $0.00784 |
| Haiku 4.5 | $0.00004 | $0.00392 |
Grade A, and why
fiftyone-develop-plugin 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 8d 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 -X POST http://localhost:5151/operators \ How it starts
The opening of the file, as written. The whole thing — 434 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Develop FiftyOne Plugins
TL;DR — Read This First
Step 1: Decide what you're building.
| Goal | Type | Read next |
|---|---|---|
| Run a computation, process samples, trigger actions | Operator | PYTHON-OPERATOR.md |
| Persistent panel in the grid, simple/form UI | Python Panel | PYTHON-PANEL.md |
| Persistent panel in the grid, rich/interactive UI | Hybrid Panel | HYBRID-PLUGINS.md + JAVASCRIPT-PANEL.md |
| Panel that opens inside the sample modal | JS Modal Panel | JAVASCRIPT-PANEL.md |
Step 2: Read that file NOW — before generating any code. Each file contains patterns that are not in SKILL.md. Missing them causes the most common failures (wrong default= usage, handler binding errors, panel not appearing in App).
If something isn't rendering or you hit an error: Read TROUBLESHOOTING.md for the one-shot diagnostic command, reload vs restart table, and the top 5 error patterns with exact fixes.
For input types, Panel UI components reference, and a minimal working example: Read QUICK-REFERENCE.md.
Step 3: Clone the official plugins repo for reference patterns:
git clone https://github.com/voxel51/fiftyone-plugins.git /tmp/fiftyone-plugins 2>/dev/null || true
Step 4: Install your plugin by placing it (or symlinking it) in the plugins directory:
PLUGINS_DIR=$(python -c "import fiftyone as fo; print(fo.config.plugins_dir)")
# Convention: use underscores in the directory name (e.g. myorg_my_plugin) for shell compatibility
# The @org/name URI lives only inside fiftyone.yml — the directory name doesn't need to match
ln -s /path/to/my_plugin "$PLUGINS_DIR/my_plugin"
Step 5: Launch in debug mode so you see all server logs:
fiftyone app debug <dataset-name>
Key Directives
ALWAYS follow these rules:
1. Understand before coding
Ask clarifying questions. Never assume what the plugin should do.
What ships with it
9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 434 lines · 42 tokens per session scan A 6b7bc92ab9fb
fiftyone-develop-plugin is a skill published in the GitHub repository voxel51/fiftyone-skills (39 stars, last pushed 22d ago), licensed Apache-2.0. It adds 42 tokens to every session and 3,920 once invoked, about $0.0002 per session on Opus 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.
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