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 klh/speedy-claude --skill zod4git clone --depth 1 https://github.com/klh/speedy-claudeWrote 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/klh/speedy-claude/zod4)<a href="https://agentmods.dev/skills/klh/speedy-claude/zod4"><img src="https://agentmods.dev/badge/skills/klh/speedy-claude/zod4/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/klh/speedy-claude/zod4"><img src="https://agentmods.dev/badge/skills/klh/speedy-claude/zod4.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 307 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00054 | $0.01990 |
| Opus 5 | $0.00027 | $0.00995 |
| Sonnet 5 | $0.00011 | $0.00398 |
| Haiku 4.5 | $0.00005 | $0.00199 |
Grade A, and why
zod4 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 5d 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 — 319 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zod 4 Expert Guide
Zod 4 is a major release with significant performance improvements, reduced TypeScript compilation times, and a cleaner API. This skill covers migration from v3 and idiomatic Zod 4 usage.
Quick Migration Checklist
Before diving deep, address these high-impact breaking changes:
| Change | Zod 3 | Zod 4 |
|---|---|---|
| Record schemas | z.record(z.string()) |
z.record(z.string(), z.string()) |
| Strict objects | .strict() |
z.strictObject({...}) |
| Passthrough | .passthrough() |
z.looseObject({...}) |
| Error formatting | err.format() |
z.treeifyError(err) |
| Coerce input type | string |
unknown |
Install Zod 4:
npm install zod@^4.5.0
Zod 4.5 (current)
z.compile() — the headline feature
Pre-compile any schema for hot paths: 3–9x faster parsing, up to 9x less memory per schema.
import { z } from "zod";
const UserSchema = z.object({ id: z.string(), email: z.string().email() });
const CompiledUser = z.compile(UserSchema); // returns a drop-in schema
CompiledUser.parse(payload); // same API, compiled fast-path
Use for: request validators, per-message parsers, anything parsing in a loop. Compile once at module init. Un-compiled schemas behave as before — no pressure to compile cold paths.
JSON Schema conversion matured
First-party z.toJSONSchema() (introduced in 4.0) got correctness fixes in 4.5 — notably falsy prefault values and several conversion soundness fixes. See klh-zod-validation (references/openapi.md) for the full schema-boundary workflow (JSON Schema → OpenAPI → Postman).
Stricter soundness fixes — check on upgrade
4.5 ships "potentially breaking bug fixes": some validations are now stricter. When bumping 4.x → 4.5, re-run the test suite against edge-case fixtures (empty strings, falsy defaults, undefined inputs) rather than assuming a minor bump is free.
What ships with it
3 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.
- 5d ago Changed · +34 lines 3265a2057184
- 9d ago First seen · 285 lines · 54 tokens per session scan A d6ad44165db0
zod4 is a skill published in the GitHub repository klh/speedy-claude (11 stars, last pushed 3d ago), licensed MIT. It adds 54 tokens to every session and 1,990 once invoked, about $0.0003 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 2026-08-30.
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