Headlong is a Bash-based agent microharness for running language-model agents in persistent, self-directed loops. People use it to create agents that maintain ongoing interests and projects, interact through shell commands, and share one stream of conversations across a team and chat services.
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 skills add laude-institute/headlong --skill web-researchgit clone --depth 1 https://github.com/laude-institute/headlongWrote 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/laude-institute/headlong/web-research)<a href="https://agentmods.dev/skills/laude-institute/headlong/web-research"><img src="https://agentmods.dev/badge/skills/laude-institute/headlong/web-research/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/laude-institute/headlong/web-research"><img src="https://agentmods.dev/badge/skills/laude-institute/headlong/web-research.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 38 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00032 | $0.00403 |
| Opus 5 | $0.00016 | $0.00201 |
| Sonnet 5 | $0.00006 | $0.00081 |
| Haiku 4.5 | $0.00003 | $0.00040 |
Grade A, and why
web-research scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
description: Research topics using the web via curl. Use when the user asks to look something up, find current information, or research a topic online. What it actually says
web-research
When to use
User asks to look something up, find current information, research a topic, or answer a question that requires up-to-date knowledge beyond what you have in context.
Common operations
Fetch a web page
curl -sL "https://example.com" | head -200
Search via DuckDuckGo (HTML)
query="your search terms"
curl -sL "https://html.duckduckgo.com/html/?q=$(printf '%s' "$query" | jq -sRr @uri)" \
| grep -oP 'href="https?://[^"]*"' | head -10
Fetch and extract text from HTML
# Strip HTML tags for readable text
curl -sL "$url" | sed 's/<[^>]*>//g' | sed '/^$/d' | head -100
Fetch JSON APIs
curl -s "https://api.example.com/endpoint" | jq '.results[]'
Download a file
curl -sLO "https://example.com/file.txt"
Tips
- Always use
-s(silent) and-L(follow redirects) with curl - Pipe HTML through
sed 's/<[^>]*>//g'for rough text extraction - Use
headortailto limit output — full web pages are huge - For JavaScript-heavy sites, raw curl won't render dynamic content
- Rate-limit requests — don't hammer endpoints in tight loops
- Check robots.txt before scraping extensively
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.
- 10d ago First seen · 54 lines · 32 tokens per session scan A 51cee33b3add
web-research is a skill published in the GitHub repository laude-institute/headlong (1,144 stars, last pushed today), licensed Apache-2.0. It adds 32 tokens to every session and 403 once invoked, about $0.0002 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 2026-08-30.
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