agentmods.dev

fiber-api

A set of rules for using Fiber AI APIs, which provide company research and contact data. It covers authentication, credit use, bulk searches, and handling sensitive contact details.

In plain words
What is it for?
Use it when building company searches, enriching records, revealing contacts, or creating bulk prospect lists with Fiber AI.
Why use it?
It helps prevent leaked API keys, unexpected credit charges, and unsafe logging of personal contact information.

Cursor rule

2 2mo ago A scan 22 tokens original MIT
View the source file fiber-ai/fiber-ai-plugin
Install

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.

agentmods
npx agentmods add rules/fiber-ai/fiber-ai-plugin/fiber-api
Clone the repo
git clone --depth 1 https://github.com/fiber-ai/fiber-ai-plugin
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 348 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00022 $0.00348
Opus 5 $0.00011 $0.00174
Sonnet 5 $0.00004 $0.00070
Haiku 4.5 $0.00002 $0.00035

Measured yesterday against content hash 1e7fc03e77f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

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 yesterday.

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.

cursor/rules/fiber-api.mdc · 45 lines

What it actually says

Fiber AI API Rules

Authentication

  • Always use the FIBER_API_KEY environment 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
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. yesterday First seen · 45 lines · 22 tokens per session scan A 1e7fc03e77f5

Subscribe to this mod's changes

fiber-api is a cursor rule published in the GitHub repository fiber-ai/fiber-ai-plugin (2 stars, last pushed 2mo ago), licensed MIT. It adds 22 tokens to every session and 348 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.

Backend and APIsResearch
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