Borrowing it
Nothing to install: this file belongs to ShawnBaek/kindle-weekly-letter. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ShawnBaek/kindle-weekly-letter/main/.claude/skills/sources/SKILL.mdgit clone --depth 1 https://github.com/ShawnBaek/kindle-weekly-letterWrote 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.
[](https://agentmods.dev/skills/shawnbaek/kindle-weekly-letter/sources)<a href="https://agentmods.dev/skills/shawnbaek/kindle-weekly-letter/sources"><img src="https://agentmods.dev/badge/skills/shawnbaek/kindle-weekly-letter/sources/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.
<a href="https://agentmods.dev/skills/shawnbaek/kindle-weekly-letter/sources"><img src="https://agentmods.dev/badge/skills/shawnbaek/kindle-weekly-letter/sources.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00030 | $0.00453 |
| Opus 5 | $0.00015 | $0.00227 |
| Sonnet 5 | $0.00006 | $0.00091 |
| Haiku 4.5 | $0.00003 | $0.00045 |
Grade A, and why
sources 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 11d 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
Manage Sources
Read sources.json at the project root.
Commands
Based on $ARGUMENTS, do one of:
/sources list or /sources list [topic]
Display all sources grouped by topic in a readable table:
Topic: AI Engineering News
▲5 Anthropic Blog (anthropic.com/blog) — active
▲5 OpenAI Blog (openai.com/blog) — active
▲4 Hacker News (news.ycombinator.com) — active
...
If a topic is specified, show only that topic. Sort by votes descending.
/sources vote [topic] [source name]
Increment the vote count for the matching source by 1. Save to sources.json.
/sources unvote [topic] [source name]
Decrement the vote count for the matching source by 1 (minimum 0). Save to sources.json.
/sources add [topic] [source name] [url]
Add a new source to the specified topic with votes=1 and status=active. Save to sources.json.
/sources remove [topic] [source name]
Set status to "inactive" (don't delete — keep for history). Save to sources.json.
/sources (no arguments)
Show all sources for all topics with vote counts.
Notes
- Match topic by id (e.g., "ai_news") or by partial name (e.g., "ai", "ios", "english")
- Match source by partial name, case-insensitive
- After any change, confirm what was updated and show the updated topic
- Sources with status "inactive" are shown with
strikethroughbut still kept in the file - Agent prompts in
prompts/referencesources.json— higher voted sources get higher priority
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.
- 11d ago First seen · 48 lines · 0 tokens per session scan A 40c2ac14d162
sources is a skill published in the GitHub repository ShawnBaek/kindle-weekly-letter (2 stars, last pushed 5mo ago), licensed MIT. It adds 30 tokens to every session and 453 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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