cast-verify

cast-verify is a skill for Claude Code from codecast-sh/codecast. It costs 79 tokens per session (471 once invoked), scanned A, original, MIT.

A workflow for proving that completed work behaves as claimed and recording evidence for reviewers. It runs repository checks and exercises the change through a browser, command line, API, backend, or mobile simulator as appropriate.

In plain words
What is it for?
Use it before marking work done to run tests, type checks, and linting, verify the relevant user flow, test failure paths, and attach the results.
Why use it?
Saying that work is finished does not show that it works. Saved test output, real usage, screenshots, and failure checks give reviewers something they can inspect.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Good fit Use it before marking work done to run tests, type checks, and linting, verify the relevant user flow, test failure paths, and attach the results.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/codecast-sh/codecast/cast-verify
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.

Any agent
npx skills add codecast-sh/codecast --skill cast-verify
Clone the repo
git clone --depth 1 https://github.com/codecast-sh/codecast

Made for: Claude Code.

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 cast-verify

README.md
[![agentmods](https://agentmods.dev/badge/skills/codecast-sh/codecast/cast-verify/github.svg)](https://agentmods.dev/skills/codecast-sh/codecast/cast-verify)
Your own site
<a href="https://agentmods.dev/skills/codecast-sh/codecast/cast-verify"><img src="https://agentmods.dev/badge/skills/codecast-sh/codecast/cast-verify/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.

agentmods 80×15 button for cast-verify

Your own site · 80×15
<a href="https://agentmods.dev/skills/codecast-sh/codecast/cast-verify"><img src="https://agentmods.dev/badge/skills/codecast-sh/codecast/cast-verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 471 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00079 $0.00471
Opus 5.5 $0.00032 $0.00188
Sonnet 5.5 $0.00016 $0.00094
Haiku 4.5 $0.00008 $0.00047

Measured 1mo ago against content hash e03ca536c88c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cast-verify 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 1mo 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.

packages/cli/skills/cast-verify/SKILL.md · 49 lines

What it actually says

Asserting success is worth nothing; evidence is what a reviewer can check without rerunning. The rule is: show it, then say it.

Checks

Run what the repository defines: typecheck, tests for the packages touched, lint. Fix what fails. Keep the exact command and the last lines of its output; they go in the evidence.

Exercise the change

Pick the surface that matches the change:

  • Web: cast browser open <url> in the human's Chrome, drive the flow with cast browser do, and capture cast browser shot --share --alt "<what it shows>" at the moments that prove the behaviour. A flow that a reader should watch: cast browser steps with shots before and after.
  • CLI or API: run the real command against real data and keep the output.
  • Backend: an end to end test or a request against the deployed function.
  • Mobile: the simulator, with a screenshot via cast image.

Test the failure path too when the change has one. A screenshot of the happy path alone proves half the claim.

Attach

cast task comment <id> -t review - <<'EVIDENCE'
Verified: <one line per claim, each with the command or the image link>
Not verified: <what remains and why>
EVIDENCE

Put the same images inline in the reply as ![caption](url) so the thread shows them. When the change is on a pull request, the same block goes in the PR description.

Then

Mark the task done only for the claims that have evidence: cast task done <id> -m "<what was verified and how>". Anything without evidence stays open and is named in the reply as not verified.

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. 1mo ago First seen · 49 lines · 79 tokens per session scan A e03ca536c88c

Subscribe to this mod's changes

cast-verify is a skill published in the GitHub repository codecast-sh/codecast (40 stars, last pushed today), licensed MIT. It adds 79 tokens to every session and 471 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-15.

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