What is validate-payload?

A skill for checking an incoming request against a JSON Schema, a formal description of the fields and values an API accepts. It returns errors with field locations and records failed checks with a correlation ID.

Use it at API endpoints that need request-body validation, structured field errors, or logged validation failures.

It catches malformed requests before the rest of the system processes them and makes validation failures easier to trace.

validate-payload — Skill by coderadius-ai

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/coderadius-ai/coderadius/validate-payload

Any agent

npx skills add coderadius-ai/coderadius --skill validate-payload

Clone the repo

git clone --depth 1 https://github.com/coderadius-ai/coderadius

Made for: Claude Code, Codex.

Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 68 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.

Model	Per session	Once invoked
Fable 5	$0.00016	$0.00068
Opus 5	$0.00008	$0.00034
Sonnet 5	$0.00003	$0.00014
Haiku 4.5	$0.00002	$0.00007

Measured yesterday against content hash 9f69ca7522ad, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

validate-payload 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.

tests/fixtures/microservices/notification-service/.claude/skills/validate-payload/SKILL.md · 12 lines

What it actually says