api-16-grpc

api-16-grpc is a skill for Claude Code, Codex from vigilantshield/Claude-HunterKit. It costs 46 tokens per session (1,680 once invoked), scanned A, original, no licence file.

Security testing guidance for gRPC APIs, which are services that communicate using structured remote procedure calls and Protocol Buffers. It covers common access-control, authentication, input, metadata, reflection, and TLS problems.

In plain words
What is it for?
Testing gRPC services for protobuf input flaws, broken object- or function-level authorization, missing authentication, reflection abuse, metadata injection, and TLS configuration errors.
Why use it?
It helps find weaknesses that ordinary web-API checks may miss. The checks focus on whether callers can reach the wrong RPC methods, send unsafe data, or connect without proper protection.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

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 skills/vigilantshield/claude-hunterkit/api-16-grpc
Any agent
npx skills add vigilantshield/Claude-HunterKit --skill api-16-grpc
Clone the repo
git clone --depth 1 https://github.com/vigilantshield/Claude-HunterKit

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for api-16-grpc

README.md
[![agentmods](https://agentmods.dev/badge/skills/vigilantshield/claude-hunterkit/api-16-grpc.svg)](https://agentmods.dev/skills/vigilantshield/claude-hunterkit/api-16-grpc)
Your own site
<a href="https://agentmods.dev/skills/vigilantshield/claude-hunterkit/api-16-grpc"><img src="https://agentmods.dev/badge/skills/vigilantshield/claude-hunterkit/api-16-grpc.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,680 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. Scan, not verified.
Origin unknown 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 5.1 $0.00046 $0.01680
Opus 5 $0.00023 $0.00840
Sonnet 5 $0.00009 $0.00336
Haiku 4.5 $0.00005 $0.00168

Measured 6d ago against content hash 46160683183c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

api-16-grpc scanned grade A 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 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.

Sends data to an external URLlowData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

grpcurl -plaintext -d '{}' target.com:50051 UserService/GetAllUsers

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

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

- curl / httpx
skills/api/api-16-grpc/SKILL.md · 232 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

1 file 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.

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. 6d ago First seen · 232 lines · 46 tokens per session scan A 46160683183c

Subscribe to this mod's changes

api-16-grpc is a skill published in the GitHub repository vigilantshield/Claude-HunterKit (5 stars, last pushed 1mo ago), with no licence file. It adds 46 tokens to every session and 1,680 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 2 findings (sends data to an external url, 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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