A workflow for exploring an idea by building a small experimental version, or for choosing the next experiment from existing ones. An experiment, or spike, is a short investigation used to learn before committing to a full build.

Use it to explore an idea, propose a useful next experiment, quickly build a known experiment, or package its findings for later work.

It helps test uncertain ideas and record what was learned before turning them into regular project work.

gsd-spike — Command for Claude Code by mrmyothet

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.

Clone the repo

git clone --depth 1 https://github.com/mrmyothet/zach-hair-studio

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/mrmyothet/zach-hair-studio/gsd-spike/github.svg)](https://agentmods.dev/commands/mrmyothet/zach-hair-studio/gsd-spike)

Your own site

<a href="https://agentmods.dev/commands/mrmyothet/zach-hair-studio/gsd-spike"><img src="https://agentmods.dev/badge/commands/mrmyothet/zach-hair-studio/gsd-spike/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.

Your own site · 80×15

<a href="https://agentmods.dev/commands/mrmyothet/zach-hair-studio/gsd-spike"><img src="https://agentmods.dev/badge/commands/mrmyothet/zach-hair-studio/gsd-spike.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 570 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.

Model	Per session	Once invoked
Fable 5.1	$0.00023	$0.00570
Opus 5	$0.00012	$0.00285
Sonnet 5	$0.00005	$0.00114
Haiku 4.5	$0.00002	$0.00057

Measured 9d ago against content hash 97eb25562595, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

gsd-spike 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 9d 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.

landing-page/.claude/commands/gsd-spike.md · 58 lines

What it actually says

Two modes:

Idea mode (default) — describe an idea to spike
Frontier mode (no argument or "frontier") — analyzes existing spike landscape and proposes integration and frontier spikes

Does not require prior new-project setup — auto-creates .planning/spikes/ if needed.

<execution_context> @/home/myothet/repos/vct/zach-hair-studio/landing-page/.claude/gsd-core/workflows/spike.md @/home/myothet/repos/vct/zach-hair-studio/landing-page/.claude/gsd-core/workflows/spike-wrap-up.md @/home/myothet/repos/vct/zach-hair-studio/landing-page/.claude/gsd-core/references/ui-brand.md </execution_context>

<runtime_note> Copilot (VS Code): Use vscode_askquestions wherever this workflow calls AskUserQuestion. </runtime_note>

Available flags:

--quick — Skip decomposition/alignment, jump straight to building. Use when you already know what to spike.
--text — Use plain-text numbered lists instead of AskUserQuestion (for non-Claude runtimes).
--wrap-up — Package spike findings into a persistent project skill for future build conversations. Runs the spike-wrap-up workflow.

Preserve all workflow gates (prior spike check, decomposition, research, risk ordering, observability assessment, verification, MANIFEST updates, commit patterns).

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.

9d ago First seen · 58 lines · 23 tokens per session scan A 97eb25562595

Subscribe to this mod's changes

gsd-spike is a command published in the GitHub repository mrmyothet/zach-hair-studio (11 stars, last pushed 28d ago), licensed MIT. It adds 23 tokens to every session and 570 once invoked, about $0.0001 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 2026-09-03.

Planning

gsd-spike

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other commands, from other repositories

checklist

clarify

specify

converge

implement

analyze