Borrowing it
Nothing to install: this file belongs to NimbleBrainInc/mcp-folk. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/NimbleBrainInc/mcp-folk/main/CLAUDE.mdgit clone --depth 1 https://github.com/NimbleBrainInc/mcp-folkWrote 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/instructions/nimblebraininc/mcp-folk/claude-md)<a href="https://agentmods.dev/instructions/nimblebraininc/mcp-folk/claude-md"><img src="https://agentmods.dev/badge/instructions/nimblebraininc/mcp-folk/claude-md.svg" alt="Measured on agentmods" 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 | $0.01111 | $0.01111 |
| Opus 5 | $0.00556 | $0.00556 |
| Sonnet 5 | $0.00222 | $0.00222 |
| Haiku 4.5 | $0.00111 | $0.00111 |
Grade A, and why
mcp-folk CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Folk CRM MCP Server
MCP server providing Folk CRM functionality via Folk's REST API.
Architecture
src/mcp_folk/
├── server.py # MCP tools (FastMCP) + stdio entrypoint
├── api_client.py # Async HTTP client for Folk API
└── api_models.py # Pydantic models for API responses
Critical
- Package name:
@nimblebraininc/folk(npm-style, matches GitHub org) - Manifest uses module execution:
python -m mcp_folk.server - Server needs both entrypoints:
app = mcp.http_app() # HTTP deployment if __name__ == "__main__": mcp.run() # Stdio for Claude Desktop / mpak
user_config
API key configured via manifest user_config, not hardcoded:
{
"user_config": {
"api_key": {
"type": "string",
"sensitive": true,
"required": true
}
},
"server": {
"mcp_config": {
"env": { "FOLK_API_KEY": "${user_config.api_key}" }
}
}
}
Available Tools
AI-friendly tools designed for minimal token usage and intent-based operations.
Search (Tier 1 - Use First)
| Tool | Purpose | Returns |
|---|---|---|
find_person(name) |
Find people by name | {found, matches: [{id, name, email}], total} |
find_company(name) |
Find companies by name | {found, matches: [{id, name, industry}], total} |
Details (Tier 2 - After Finding)
| Tool | Purpose |
|---|---|
get_person_details(person_id) |
Full person info after finding |
get_company_details(company_id) |
Full company info after finding |
Browse (Tier 3 - Exploration)
| Tool | Purpose |
|---|---|
browse_people(page, per_page) |
Paginated list of all people |
browse_companies(page, per_page) |
Paginated list of all companies |
Actions (Tier 4 - Mutations)
| Tool | Purpose |
|---|---|
add_person(first_name, ...) |
Create new person |
add_company(name, ...) |
Create new company |
update_person(person_id, ...) |
Update person fields |
update_company(company_id, ...) |
Update company fields |
delete_person(person_id) |
Delete a person |
delete_company(company_id) |
Delete a company |
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.
- 6d ago First seen · 158 lines · 1,111 tokens per session scan A 8d6fd9a5ebe3
mcp-folk CLAUDE.md is an instructions file published in the GitHub repository NimbleBrainInc/mcp-folk (6 stars, last pushed 3mo ago), licensed MIT. It adds 1,111 tokens to every session, about $0.0056 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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