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 bluesaurel/antigravity-cat-toolkit --skill antigravity-cat-bridgegit clone --depth 1 https://github.com/bluesaurel/antigravity-cat-toolkitWrote 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/bluesaurel/antigravity-cat-toolkit/antigravity-cat-bridge)<a href="https://agentmods.dev/skills/bluesaurel/antigravity-cat-toolkit/antigravity-cat-bridge"><img src="https://agentmods.dev/badge/skills/bluesaurel/antigravity-cat-toolkit/antigravity-cat-bridge/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/skills/bluesaurel/antigravity-cat-toolkit/antigravity-cat-bridge"><img src="https://agentmods.dev/badge/skills/bluesaurel/antigravity-cat-toolkit/antigravity-cat-bridge.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 | $0.00016 | $0.01113 |
| Opus 5 | $0.00008 | $0.00557 |
| Sonnet 5 | $0.00003 | $0.00223 |
| Haiku 4.5 | $0.00002 | $0.00111 |
Grade A, and why
cat-bridge 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
📝 Cat-Bridge: The Knowledge Nexus
0. Deployment & Initialization
- Location: The scratchpad MUST be located at
.agents/scratchpad/within the active workspace root. - Auto-Creation: If the directory does not exist, the agent must proactively create it during the first
Cat-Bridgeoperation. - Distribution: When distributing this toolkit, only the package should be provided. The scratchpad folder is environment-specific and will be generated dynamically on-site.
1. Shared Scratchpad Protocol
- Path:
.agents/scratchpad/(Hidden directory)
- Read on Arrival: Absorb context from existing files in
.agents/scratchpad/immediately upon arrival. - Write on Progress: Log critical findings (e.g., code structure, logic analysis) to the scratchpad immediately.
- Sync on Dismissal: Update
SUMMARY.mdwith a final session summary before dismissal for the next agent.
2. Scratchpad Usage Guidelines
What ships with it
2 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.
- 10d ago First seen · 66 lines · 16 tokens per session scan A dfaebe89fe72
cat-bridge is a skill published in the GitHub repository bluesaurel/antigravity-cat-toolkit (2 stars, last pushed 5mo ago), licensed MIT. It adds 16 tokens to every session and 1,113 once invoked, about $0.0001 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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