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/fiber-ai/fiber-ai-pluginWrote 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/fiber-ai/fiber-ai-plugin/fiber-api)<a href="https://agentmods.dev/rules/fiber-ai/fiber-ai-plugin/fiber-api"><img src="https://agentmods.dev/badge/rules/fiber-ai/fiber-ai-plugin/fiber-api/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/rules/fiber-ai/fiber-ai-plugin/fiber-api"><img src="https://agentmods.dev/badge/rules/fiber-ai/fiber-ai-plugin/fiber-api.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 | $0.00022 | $0.00348 |
| Opus 5.5 | $0.00009 | $0.00139 |
| Sonnet 5.5 | $0.00004 | $0.00070 |
| Haiku 4.5 | $0.00002 | $0.00035 |
Grade A, and why
fiber-api 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 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.
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
Fiber AI API Rules
Authentication
- Always use the
FIBER_API_KEYenvironment variable for API authentication - Never hardcode API keys in source code
- API key is available at https://fiber.ai/app/api
Credit Awareness
- Check credit balance before expensive operations (enrichment, audience building)
- Always show cost estimates to the user before proceeding with credit-charging operations
- Individual reveals cost credits per contact
- Audience builds cost 1 credit per entity found
- Credit balance and top-up available at https://www.fiber.ai/app/subscription
Data Handling
- Treat all contact data (emails, phones) as sensitive PII
- Never log or print API keys or full contact details in production code
- Use environment variables for all configuration values
Workflow Best Practices
- For bulk operations (more than 5 contacts): use the Audience workflow, not individual reveals
- Audience workflow order: Create, Set Params, Build, Estimate Cost, Enrich, Export
- Always confirm with the user before any credit-charging operation
- Never skip the cost estimate step in audience workflows
MCP Servers
- V2 (direct tools for common operations):
https://mcp.fiber.ai/mcp/v2 - Core (meta-tools for all 100+ endpoints):
https://mcp.fiber.ai/mcp - Transport type: HTTP (Streamable HTTP)
SDKs
- TypeScript:
npm install @fiberai/sdk - Python:
pip install fiberai
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.
- 2mo ago First seen · 45 lines · 22 tokens per session scan A 1e7fc03e77f5
fiber-api is a cursor rule published in the GitHub repository fiber-ai/fiber-ai-plugin (2 stars, last pushed 18d ago), licensed MIT. It adds 22 tokens to every session and 348 once invoked, about $0.0001 per session on Opus 5.5. 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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