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arc: Skill for Claude Code

.claude/skills/decision-capture/SKILL.md

decision-capture is a skill for Claude Code from teejayen/arc. It costs 37 tokens per session (414 once invoked), scanned A, original, MIT.

A decision record that saves what was chosen, the alternatives considered, and the reasoning behind it.

In plain words
What is it for?
Use it when a choice has been made, options were compared, or the reasoning needs to be remembered later.
Why use it?
It prevents important context from being lost after a conversation. Future readers can understand not only the decision, but also its trade-offs.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

This is teejayen/arc's own configuration. It tells Claude Code how to work on arc itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything arc configures →

not rated 5repo 9mo ago A scan 37 tokens original MIT
View source ↗ teejayen/arc
Reuse

Borrowing it

Nothing to install: this file belongs to teejayen/arc. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/teejayen/arc/main/.claude/skills/decision-capture/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/teejayen/arc

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 decision-capture

README.md
[![agentmods](https://agentmods.dev/badge/skills/teejayen/arc/decision-capture/github.svg)](https://agentmods.dev/skills/teejayen/arc/decision-capture)
Your own site
<a href="https://agentmods.dev/skills/teejayen/arc/decision-capture"><img src="https://agentmods.dev/badge/skills/teejayen/arc/decision-capture/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 decision-capture

Your own site · 80×15
<a href="https://agentmods.dev/skills/teejayen/arc/decision-capture"><img src="https://agentmods.dev/badge/skills/teejayen/arc/decision-capture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 414 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 $0.00037 $0.00414
Opus 5.5 $0.00015 $0.00166
Sonnet 5.5 $0.00007 $0.00083
Haiku 4.5 $0.00004 $0.00041

Measured 2mo ago against content hash 2963cecd85f8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

decision-capture 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 2mo 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.

.claude/skills/decision-capture/SKILL.md · 84 lines

What it actually says

Decision Capture

Extract and document a decision from the conversation.

When to Use

  • A clear decision has been made during conversation
  • User wants to record reasoning for future reference
  • Trade-offs were weighed and a choice was made

Execution Steps

Step 1: Get date

date "+%Y-%m-%d"

Step 2: Identify the decision

If not clear from context, ask which decision to capture.

Step 3: Create decision file

Location: decisions/YYYY-MM-DD-decision-topic.md

---
title: "Decision: [Clear title]"
created: YYYY-MM-DD
tags: [decision, relevant-area]
status: active
---

# Decision: [Clear title]

**Date:** YYYY-MM-DD
**Area:** [Which life domain - career, projects, family, etc.]

## The Decision
[Clear statement of what was decided]

## Context
[What situation led to needing this decision]

## Options Considered

### Option 1: [Name]
[Description]
- Pros: ...
- Cons: ...

### Option 2: [Name]
[Description]
- Pros: ...
- Cons: ...

## Why This Option
[The reasoning and trade-offs that led to this choice]

## Implications
- What this means for...
- Changes to...

## Success Criteria
[How we'll know it was the right call]

## Review
[When to revisit - "in 3 months", "after X happens", or "no review needed"]

## Related
- [[session-file-if-applicable]]
- [[related-notes]]

Step 4: Confirm

  • Confirm the file location
  • Remind that /session will push to GitHub
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. 2mo ago First seen · 84 lines · 37 tokens per session scan A 2963cecd85f8

Subscribe to this mod's changes

decision-capture is a skill published in the GitHub repository teejayen/arc (5 stars, last pushed 9mo ago), licensed MIT. It adds 37 tokens to every session and 414 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 2026-08-31.

Memory and context
Related

decision-capture compared with skills from other repositories

decision-capture next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
decision-captureteejayen/arcSkill59mo agoMITA37Claude Code
knowledge-ingestopenclaw/openclawSkill394kyesterdayMITA80Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0Skill68k2d agoApache-2.0A217Claude Code, Codex
forgetasgeirtj/system_prompts_leaksSkill71k2d agoCC0-1.0A74Claude Code, Codex
Cortexdanielmiessler/LifeOSSkill20kyesterdayMITA184Claude Code
memoryopensquilla/opensquillaSkill7.1k6d agoApache-2.0A44Claude Code, Codex
ha-data-storesshiwenwen/hope-agentSkill1.9kyesterdayMITA115Claude Code, Codex