gsd:spike

gsd:spike is a command for Claude Code from mrboups/xbrain. It costs 24 tokens per session (584 once invoked), scanned A, a copy of gsd:spike, MIT.

An exploration workflow for testing an idea through a small practical experiment, or choosing the next experiment to run.

In plain words
What is it for?
Use it to investigate ideas, build exploratory prototypes, research open questions, and record findings for later development.
Why use it?
It helps uncover risks and useful findings before building the full feature.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: names the AskUserQuestion tool.

Good fit Use it to investigate ideas, build exploratory prototypes, research open questions, and record findings for later development.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/mrboups/xbrain/spike
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/mrboups/xbrain

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 gsd:spike

README.md
[![agentmods](https://agentmods.dev/badge/commands/mrboups/xbrain/spike.svg)](https://agentmods.dev/commands/mrboups/xbrain/spike)
Your own site
<a href="https://agentmods.dev/commands/mrboups/xbrain/spike"><img src="https://agentmods.dev/badge/commands/mrboups/xbrain/spike.svg" alt="Measured on agentmods" height="20"></a>
Per session 24 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 584 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 94% copy Near-identical to another mod 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 $0.00024 $0.00584
Opus 5 $0.00012 $0.00292
Sonnet 5 $0.00005 $0.00117
Haiku 4.5 $0.00002 $0.00058

Measured 4d ago against content hash 147fd008b3c9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, 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 4d 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.

Origin

This is a copy

94% identical to gsd:spike — 13 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/commands/gsd/spike.md · 57 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 /gsd-new-project — auto-creates .planning/spikes/ if needed.

<execution_context> @D:/VSC/xbrain/.claude/get-shit-done/workflows/spike.md @D:/VSC/xbrain/.claude/get-shit-done/workflows/spike-wrap-up.md @D:/VSC/xbrain/.claude/get-shit-done/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.

  1. 4d ago First seen · 57 lines · 24 tokens per session scan A 147fd008b3c9

Subscribe to this mod's changes

gsd:spike is a command published in the GitHub repository mrboups/xbrain (2 stars, last pushed 24d ago), licensed MIT. It adds 24 tokens to every session and 584 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to gsd:spike, differing in 13 lines, and is treated as a copy.