demo-day

demo-day is a skill for Claude Code from a-lottes/aSPARK. It costs 61 tokens per session (1,696 once invoked), scanned A, original, MIT.

A hands-on quality check for a running web app. A tester uses a real browser to check the requirements, try cases beyond the normal path, and record reproducible bugs.

In plain words
What is it for?
Use it after a review has passed to test an app against its acceptance criteria, investigate edge cases, and retest fixes.
Why use it?
Reading code alone can miss problems that users encounter in the browser, such as broken interactions or unexpected input.

Skill for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the aspark plugin — 10 skills, 7 agents shipped together

Good fit Use it after a review has passed to test an app against its acceptance criteria, investigate edge cases, and retest fixes.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add a-lottes/aSPARK
Claude Code
/plugin install aspark

Made for: Claude Code.

Or install aspark, the plugin that ships this one along with the rest of its 10 skills, 7 agents.

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 demo-day

README.md
[![agentmods](https://agentmods.dev/badge/skills/a-lottes/aspark/demo-day/github.svg)](https://agentmods.dev/skills/a-lottes/aspark/demo-day)
Your own site
<a href="https://agentmods.dev/skills/a-lottes/aspark/demo-day"><img src="https://agentmods.dev/badge/skills/a-lottes/aspark/demo-day/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 demo-day

Your own site · 80×15
<a href="https://agentmods.dev/skills/a-lottes/aspark/demo-day"><img src="https://agentmods.dev/badge/skills/a-lottes/aspark/demo-day.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,696 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 $0.00061 $0.01696
Opus 5 $0.00030 $0.00848
Sonnet 5 $0.00012 $0.00339
Haiku 4.5 $0.00006 $0.00170

Measured 6d ago against content hash 751ac3903698, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

demo-day 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 6d 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/demo-day/SKILL.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/demo-day — Review (QA Tester)

You are running the QA ceremony. The product gets used, not read: every acceptance criterion is clicked through in a real browser.

Input

Argument: the app URL (and optionally the feature name). No URL → ask the user for it, and how to start the app if it isn't running.

Steps

  1. Check the gates and the gear.
    • .spark/<feature-name>/review.md must be passed. If not, stop and point to /peer-review. (The user may explicitly override this order — record that in the QA report.) The Status row answers this; the report itself belongs to the qa-tester agent's context, not to yours.
    • Only after that gate has passed, read the project's QA method if it declares one: .spark/constitution.md §8 QA Method, two fields — Browser-observable surface and Substitute verification method. Four outcomes, and only the last changes anything:
      • No constitution, no §8, or Browser-observable surface: yes → continue exactly as today: run the browser check below unchanged. Never ask the user to choose, confirm or supply a substitute method, treat this as an error or a warning, or re-negotiate whether the ceremony should be overridden. Fine, not a violation: stating in your own words, in your reply or in qa.md §1, that no declaration applies. Discouraged, capped at Minor: quoting the declaration's raw field values verbatim instead of describing the outcome. This holds at every invocation, including one where the caller demands full narration of your reasoning (spec AC-1.3/NFR-4, C19).
      • §8 present but incomplete — surface no with no method named, or an empty value → also exactly as today: run the browser check and ask the user. Ambiguity resolves toward more verification, never less.
      • Surface no, method named, but this session cannot perform itSTOP and name the part you cannot perform. A declaration is a route, never a licence to skip.
      • Surface no with a performable method named → the browser check below does not apply; proceed by the declared method without asking the user for a per-feature override, and pass the method to the QA Tester in step 2. Coverage never changes: qa.md is still produced, and every acceptance criterion and every NFR that QA owns is still verified and recorded under its own AC-/NFR- ID. You may read this declaration and never write it — only /charter creates or amends it; if you believe it is wrong, stop and point the user to /charter.
    • Unless §8 declared a performable substitute method above, confirm browser tooling is available (Claude in Chrome, Playwright MCP, Chrome DevTools MCP — whatever the session offers) and the app responds at the given URL. If either is missing, STOP and tell the user exactly what to set up or start. Never substitute code reading for testing — that holds for a declared method too: it is performed and recorded, never read off the source.
    • Only once the gates above have passed, resolve optional tool availability, once: if the session exposes MCP tools whose names end in staleness and impact (they are normally namespaced, e.g. mcp__aspark-graph__staleness), treat that as the available surface and run no command; otherwise probe once, read-only, with command -v aspark-graph >/dev/null 2>&1 && echo runner=yes || echo runner=no; test -f .aspark-graph/graph.json && echo graph=yes || echo graph=no — it reports both facts and always exits 0, so the absent case never looks like a failed command. Resolve both facts — is there a surface, and does .aspark-graph/graph.json exist — and act on the four states in ${CLAUDE_PLUGIN_ROOT}/tools/aspark-graph.md: pass the tool file in step 2 only when both hold; say its one-sentence hint, at most once, in either mixed state; and when neither holds, say nothing at all and continue exactly as you would otherwise. A run that stopped on the browser or app gate never reaches this sub-step — no tool softens that prerequisite, and the outcome here never changes a gate.
  2. Delegate to the QA Tester. Invoke the qa-tester agent with the app URL, the feature paths, the agreed viewports, any credentials/test data the user provided, the report template from ${CLAUDE_PLUGIN_ROOT}/templates/qa-report.md, and the paths of any active lenses with browser-observable checks (from the constitution's profile — ${CLAUDE_PLUGIN_ROOT}/lenses/ux.md, seo.md, security.md, i18n.md). If a tool resolved as available in step 1, pass ${CLAUDE_PLUGIN_ROOT}/tools/aspark-graph.md the same way — one more path alongside the lens paths, nothing else. Where step 1 resolved a declared substitute method, pass that method in place of the app URL and the viewports, and say they are N/A for this project — do not leave the agent to rediscover the declaration on its own. For a re-test, point it at the previous report so it verifies the fixes instead of starting from zero.
  3. Relay needs. If the agent reports missing prerequisites (login, seeded data, a second account), get them from the user and re-invoke.
  4. Present the report. The AC verification table (every criterion: pass/fail), exploratory bugs with reproduction steps, console/network findings, and the demo-day verdict — quoted honestly.
  5. Route the outcome with the user:
    • failed ACs or open Blockers/Majors → /increment (fix-mode), then /demo-day again. Re-tests cover the fixed bugs and their surrounding flows.
    • Minor bugs → the user accepts them (recorded) or sends them to fix.
  6. Close the gate. When the QA GATE checklist is genuinely satisfied, set the report status to passed.

Read the full file on GitHub · 120 lines

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. 6d ago Changed · +38 lines 751ac3903698
  2. 10d ago First seen · 82 lines · 61 tokens per session scan A 84af1de4059c

Subscribe to this mod's changes

demo-day is a skill published in the GitHub repository a-lottes/aSPARK (19 stars, last pushed today), licensed MIT. It adds 61 tokens to every session and 1,696 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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