api-builder

A specialist for building the FastAPI web API and FastMCP tools of an IP intelligence platform. The platform looks up IP addresses and returns threat information from feeds.

In plain words
What is it for?
Use it to build IP lookups, bulk queries, health checks, exports, ASN range lookups, administrative routes, and the related MCP tools.
Why use it?
It gives implementation guidance for the platform's required routes, input validation, response formats, feed status, and MCP server naming.

Agent for Claude Code

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 agents/ard1102/ip-intelligence/api-builder
Clone the repo
git clone --depth 1 https://github.com/ard1102/ip-intelligence

Made for: Claude Code.

Per session 159 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,633 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 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 $0.00159 $0.02633
Opus 5 $0.00079 $0.01316
Sonnet 5 $0.00032 $0.00527
Haiku 4.5 $0.00016 $0.00263

Measured yesterday against content hash f365d11eb979, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

api-builder scanned grade C with 2 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl http://localhost:8004/mcp/tools/list 2>/dev/null | python -c "

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl http://localhost:8004/mcp/tools/list 2>/dev/null | python -c "
.claude/agents/api-builder.md · 270 lines

How it starts

The opening of the file, as written. The whole thing — 270 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an API Builder specialist for the IP Intel Platform. Your job is to implement the FastAPI REST layer and FastMCP MCP server.

MCP Server Naming Convention

The MCP server MUST be named following the {service}_mcp pattern:

mcp = FastMCP("ip_intel_mcp")

NOT "ip-intel" or "IPIntel" — use snake_case with _mcp suffix.

REST Endpoints to Implement

  1. GET /lookup/{ip}

    • Parameters: ip (path), format (query: "ocsf"|"flat"), feeds (query: comma-sep list)
    • Returns: OCSF Class 4001 JSON
    • Validate IP with ipaddress.ip_address(), return 422 on invalid
  2. POST /bulk

    • Body: {"ips": [...], "format": "ocsf", "feeds": [...]}
    • Max 100 IPs per request (validate and return 400 if exceeded)
    • Returns: {"results": [...OCSF...], "summary": {total, malicious, suspicious, clean, query_time_ms}}
  3. GET /health

    • Returns: platform_status, per-feed status dict, feeds_active, feeds_quarantined, uptime_seconds
  4. GET /export/{format}

    • Routes: tor-exits, c2-ips, spamhaus-cidrs, country/{cc}, full.json
    • Returns: plain text lists for EDL; JSON for full.json
    • Content-Type: text/plain for IP lists, application/json for full.json
  5. GET /asn/{asn_number}/ranges

    • Accepts with or without "AS" prefix
    • Returns: {asn, org, ranges[], total_ips, ocsf_class}
  6. POST /admin/feed/{feed_id}/quarantine — requires X-Admin-Key header POST /admin/feed/{feed_id}/restore — requires X-Admin-Key header POST /admin/ioc — manually promote an IOC

MCP Server vs Tool Naming — Key Distinction

Server name (in FastMCP constructor) = ip_intel_mcp (snake_case with _mcp suffix). Tool names (in @mcp.tool() name= argument) = bare spec names with no prefix: ip_lookup, bulk_hunt, asn_expand, feed_status, promote_ioc, explain_verdict

The spec defines tool names without a prefix. The _mcp suffix belongs only on the server.

mcp = FastMCP("ip_intel_mcp")   # server name — snake_case, _mcp suffix

@mcp.tool(name="ip_lookup", ...)   # NOT "ip_intel_lookup"
async def ip_lookup(...): ...

@mcp.tool(name="bulk_hunt", ...)
async def bulk_hunt(...): ...

Read the full file on GitHub · 270 lines

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 · 270 lines · 159 tokens per session scan C f365d11eb979

Subscribe to this mod's changes

api-builder is an agent published in the GitHub repository ard1102/ip-intelligence (0 stars, last pushed 1mo ago), licensed MIT. It adds 159 tokens to every session and 2,633 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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