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/yamadashy/agent-readable/readable-mdnnpx skills add yamadashy/agent-readable --skill readable-mdngit clone --depth 1 https://github.com/yamadashy/agent-readableWrote 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/yamadashy/agent-readable/readable-mdn)<a href="https://agentmods.dev/skills/yamadashy/agent-readable/readable-mdn"><img src="https://agentmods.dev/badge/skills/yamadashy/agent-readable/readable-mdn.svg" alt="Measured on agentmods" 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 | $0.00090 | $0.00600 |
| Opus 5 | $0.00045 | $0.00300 |
| Sonnet 5 | $0.00018 | $0.00120 |
| Haiku 4.5 | $0.00009 | $0.00060 |
Grade A, and why
readable-mdn scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
description: Fetches MDN Web Docs as raw Markdown by mapping the developer.mozilla.org URL to its source file in mdn/content (en-US) or mdn/translated-content (other locales) on GitHub and curl-ing the raw blob. Cleaner What it actually says
MDN Web Docs Reader
MDN content lives on GitHub as Markdown. Fetching the raw Markdown is more compact than rendering the SPA page.
- English (
en-US): https://github.com/mdn/content - Other locales (
ja,fr,zh-CN, ...): https://github.com/mdn/translated-content
Steps
1. Map the URL to a content path
From https://developer.mozilla.org/{locale}/docs/{path}:
# en-US
https://raw.githubusercontent.com/mdn/content/main/files/en-us/{path-lowercased}/index.md
# Other locales
https://raw.githubusercontent.com/mdn/translated-content/main/files/{locale-lowercased}/{path-lowercased}/index.md
Examples:
| MDN URL | Source path |
|---|---|
developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch |
mdn/content → files/en-us/web/api/fetch_api/using_fetch/index.md |
developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Array |
mdn/translated-content → files/ja/web/javascript/reference/global_objects/array/index.md |
If the original MDN URL redirects (visible by following with curl -IL), resolve it before mapping.
2. Fetch the Markdown
# en-US
curl -s -o /tmp/mdn.md \
"https://raw.githubusercontent.com/mdn/content/main/files/en-us/{path}/index.md"
# Translated
curl -s -o /tmp/mdn.md \
"https://raw.githubusercontent.com/mdn/translated-content/main/files/{locale}/{path}/index.md"
3. Read the file
Read /tmp/mdn.md
If the path is wrong (404), fall back to WebFetch on the original developer.mozilla.org URL.
License / attribution
MDN content is dual-licensed (CC BY-SA 2.5 for prose, CC0 for code samples). When quoting, link back to the MDN page.
Reference
- MDN content repo (en-US): https://github.com/mdn/content
- Translated content: https://github.com/mdn/translated-content
- License: https://github.com/mdn/content/blob/main/LICENSE.md
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.
- 4d ago First seen · 65 lines · 90 tokens per session scan A 8da872b98ffd
readable-mdn is a skill published in the GitHub repository yamadashy/agent-readable (2 stars, last pushed 3mo ago), licensed MIT. It adds 90 tokens to every session and 600 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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