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.
npx agentmods add skills/teejayen/arc/capturenpx skills add teejayen/arc --skill capturegit clone --depth 1 https://github.com/teejayen/arcWhat 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 | $0.00042 | $0.00446 |
| Opus 5 | $0.00021 | $0.00223 |
| Sonnet 5 | $0.00008 | $0.00089 |
| Haiku 4.5 | $0.00004 | $0.00045 |
Grade A, and why
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 2d 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.
What it actually says
Capture
Save external content (bookmarks, YouTube, Spotify, articles) with context.
When to Use
- User shares a link worth saving
- External content needs to be captured with context
- Building a reference library of resources
Execution Steps
Step 1: Determine content type
From context or ask:
- bookmark ->
resources/bookmarks/ - youtube ->
resources/youtube/ - spotify ->
resources/spotify/ - article ->
resources/articles/ - other ->
resources/root or create new subfolder
Step 2: Gather details
If not provided, ask for:
- URL or identifier
- Why this matters / why saving it (this is the valuable context)
- Tags or topics it relates to
- Any specific notes
Step 3: Create capture file
Filename: descriptive-title.md (no date prefix - frontmatter has timestamp)
---
title: "[Content title]"
created: YYYY-MM-DD
source: [full URL]
platform: [youtube|spotify|web|twitter|podcast|etc]
tags: [topic, topic]
status: unprocessed
---
# [Content title]
**Source:** [URL]
**Captured:** YYYY-MM-DD
## Why I Saved This
[User's reason - the context that will matter when rediscovering this later]
## Summary
[Brief description of what this is]
## Key Points
[If applicable - remove if just a bookmark for later]
- Point 1
- Point 2
## Notes
[Additional context, quotes, timestamps for videos, etc.]
## Related
- [[relevant-notes]]
Step 4: Confirm
- Show saved location
- Suggest related areas/projects to link
- Note if this connects to current focus areas
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.
- 2d ago First seen · 77 lines · 42 tokens per session scan A c361c09b96cf
capture is a skill published in the GitHub repository teejayen/arc (5 stars, last pushed 7mo ago), licensed MIT. It adds 42 tokens to every session and 446 once invoked, about $0.0002 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 2026-08-31.
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