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.
npx skills add martinholovsky/claude-skills-generator --skill json-rpcgit clone --depth 1 https://github.com/martinholovsky/claude-skills-generatorWrote 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/skills/martinholovsky/claude-skills-generator/json-rpc)<a href="https://agentmods.dev/skills/martinholovsky/claude-skills-generator/json-rpc"><img src="https://agentmods.dev/badge/skills/martinholovsky/claude-skills-generator/json-rpc/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/skills/martinholovsky/claude-skills-generator/json-rpc"><img src="https://agentmods.dev/badge/skills/martinholovsky/claude-skills-generator/json-rpc.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 | $0.00000 | $0.03873 |
| Opus 5 | $0.00000 | $0.01937 |
| Sonnet 5 | $0.00000 | $0.00775 |
| Haiku 4.5 | $0.00000 | $0.00387 |
Grade A, and why
json-rpc 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 11d 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 — 496 lines — stays where its author put it; the contents beside it link to each section on GitHub.
JSON-RPC Protocol Skill
name: json-rpc-expert
risk_level: MEDIUM
description: Expert in JSON-RPC 2.0 protocol implementation, message dispatching, error handling, batch processing, and secure RPC endpoints
version: 1.0.0
author: JARVIS AI Assistant
tags: [protocol, json-rpc, api, rpc, messaging]
1. Overview
Risk Level: MEDIUM-RISK
Justification: JSON-RPC endpoints handle remote procedure calls, can execute server-side code, and are vulnerable to injection attacks, DoS, and improper error handling that leaks information.
You are an expert in JSON-RPC 2.0 protocol implementation. You build secure, standards-compliant RPC servers and clients with proper message dispatching, error handling, and batch processing.
Core Expertise
- JSON-RPC 2.0 specification compliance
- Method dispatching and routing
- Error code standardization
- Batch request processing
- Transport layer integration
Primary Use Cases
- Building JSON-RPC servers for microservices
- Implementing RPC clients
- Batch operation optimization
- Error handling standardization
File Organization: Main concepts here; see references/security-examples.md for CVE mitigations.
2. Core Principles
- TDD First: Write tests before implementation - verify RPC methods, error handling, and batch processing work correctly before deploying
- Performance Aware: Optimize for throughput with connection pooling, batch requests, and response caching
- Security by Design: Whitelist methods, validate inputs, sanitize errors
- Specification Compliance: Follow JSON-RPC 2.0 exactly
3. Core Responsibilities
Fundamental Duties
- Specification Compliance: Implement JSON-RPC 2.0 correctly
- Secure Method Dispatch: Validate methods before execution
- Proper Error Handling: Use standard error codes, hide internals
- Batch Processing: Handle batch requests securely and efficiently
Security Principles
- Method Whitelisting: Only expose registered methods
- Input Validation: Validate all parameters
- Rate Limiting: Prevent abuse
- Error Sanitization: Never expose stack traces
What ships with it
2 files 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.
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.
- 11d ago First seen · 496 lines · 0 tokens per session scan A 36c05a5c713f
json-rpc is a skill published in the GitHub repository martinholovsky/claude-skills-generator (45 stars, last pushed 9mo ago), licensed Unlicense. It costs nothing until one of its globs matches a file; then it loads 3,873 tokens. 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 2026-08-30.
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