spike

spike is a skill for Claude Code from ulises-jeremias/agent-toolkit. It costs 34 tokens per session (194 once invoked), scanned A, original, MIT.

A structured format for technical spikes, meaning short investigations into feasibility, architecture, or implementation choices.

In plain words
What is it for?
Use it to record findings, recommendations, trade-offs, risks, open questions, references, and next steps.
Why use it?
It turns exploratory work into documented findings instead of leaving decisions based on scattered notes or assumptions.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the agent-toolkit-complete plugin — 106 skills shipped together

Good fit Use it to record findings, recommendations, trade-offs, risks, open questions, references, and next steps.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ulises-jeremias/agent-toolkit/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.

Any agent
npx skills add ulises-jeremias/agent-toolkit --skill spike
Clone the repo
git clone --depth 1 https://github.com/ulises-jeremias/agent-toolkit

Made for: Claude Code.

Or install agent-toolkit-complete, the plugin that ships this one along with the rest of its 106 skills.

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 spike

README.md
[![agentmods](https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/spike/github.svg)](https://agentmods.dev/skills/ulises-jeremias/agent-toolkit/spike)
Your own site
<a href="https://agentmods.dev/skills/ulises-jeremias/agent-toolkit/spike"><img src="https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/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.

agentmods 80×15 button for spike

Your own site · 80×15
<a href="https://agentmods.dev/skills/ulises-jeremias/agent-toolkit/spike"><img src="https://agentmods.dev/badge/skills/ulises-jeremias/agent-toolkit/spike.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 194 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 $0.00034 $0.00194
Opus 5.5 $0.00014 $0.00078
Sonnet 5.5 $0.00007 $0.00039
Haiku 4.5 $0.00003 $0.00019

Measured 1mo ago against content hash 8bb9e72fff5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 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.

plugins/agent-toolkit-complete/.github/skills/spike/SKILL.md · 25 lines

What it actually says

Spike and Research Findings (WHAT)

Use for technical exploration, feasibility validation, architecture assessment, or research outputs that should influence design or implementation.

Default guardrails

  1. Apply output-handshake before final output.
  2. Make findings actionable: recommendation, tradeoffs, open questions, and next steps.
  3. Link from trd when the spike informs technical design.
  4. Link from adr when the spike leads to a durable decision.

References

  • references/default-template.md
  • references/example-graphql-federation.md — example spike for evaluating GraphQL Federation with tradeoffs and phased approach
  • trd
  • adr
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. 1mo ago First seen · 25 lines · 34 tokens per session scan A 8bb9e72fff5d

Subscribe to this mod's changes

spike is a skill published in the GitHub repository ulises-jeremias/agent-toolkit (19 stars, last pushed yesterday), licensed MIT. It adds 34 tokens to every session and 194 once invoked, about $0.0001 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 2026-09-04.

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