deckforge-visual-evidence

A verification skill for a DeckForge application that runs the app in a separate browser session and records what happens. It captures screenshots, errors, failed requests, accessibility results, and traces in machine-readable evidence.

In plain words
What is it for?
Use it for visual and behavior testing of generated DeckForge apps across required screen sizes and reduced-motion settings.
Why use it?
It provides evidence that the app's editor, presenter, viewer, and export-preview functions work, while marking unavailable checks as unverified.

Skill for Claude CodeCodex

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/tph-kds/deckforge/deckforge-visual-evidence
Any agent
npx skills add tph-kds/deckforge --skill deckforge-visual-evidence
Clone the repo
git clone --depth 1 https://github.com/tph-kds/deckforge

Made for: Claude Code, Codex.

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 319 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.

ModelPer sessionOnce invoked
Fable 5 $0.00071 $0.00319
Opus 5 $0.00036 $0.00160
Sonnet 5 $0.00014 $0.00064
Haiku 4.5 $0.00007 $0.00032

Measured 2d ago against content hash 6b56b723ab96, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

deckforge-visual-evidence 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 2d 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.

skills/deckforge-visual-evidence/SKILL.md · 29 lines

What it actually says

deckforge-visual-evidence

Verification worker. Prove a generated DeckForge application works by executing it.

  1. Determine changed surfaces and the required capabilities from the capability catalog.
  2. Start the target application on an isolated port (do not reuse a shared server).
  3. Run behavior-focused editor, presenter, viewer, and export-preview scenarios via Playwright.
  4. Capture the required viewports and a reduced-motion run.
  5. Record console errors, failed requests, and timing.
  6. Retry each candidate defect once before reporting.
  7. Annotate evidence with slide, block, and capability IDs.
  8. Generate browser-evidence-report.json and per-capability evidence entries.
  9. Stop all created processes and browser contexts.
  10. Mark unavailable checks unverified, never passed.

Read references/browser-evidence-contract.md and the report schema at ../../schemas/browser-evidence-report.schema.json. Map Playwright tests to capabilities with assets/evidence-capability-map.json.

Never claim a check ran when the browser, runner, or port was unavailable.

Files

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.

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. 2d ago First seen · 29 lines · 71 tokens per session scan A 6b56b723ab96

Subscribe to this mod's changes

deckforge-visual-evidence is a skill published in the GitHub repository tph-kds/deckforge (4 stars, last pushed 16d ago), licensed MIT. It adds 71 tokens to every session and 319 once invoked, about $0.0004 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 2026-08-31.

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