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 obsidiangit 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/obsidian)<a href="https://agentmods.dev/skills/laude-institute/headlong/obsidian"><img src="https://agentmods.dev/badge/skills/laude-institute/headlong/obsidian/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/obsidian"><img src="https://agentmods.dev/badge/skills/laude-institute/headlong/obsidian.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
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 →
- high Tool Misuse · line 77 Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
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 | $0.00018 | $0.01031 |
| Opus 5 | $0.00009 | $0.00515 |
| Sonnet 5 | $0.00004 | $0.00206 |
| Haiku 4.5 | $0.00002 | $0.00103 |
Grade A, and why
obsidian scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
obsidian — Obsidian vault management
Overview
An Obsidian vault is a folder of markdown files with a .obsidian/ config directory. The OBSIDIAN_VAULT environment variable must point to the vault root. All operations are filesystem-based — Obsidian detects changes automatically when running.
Obsidian Sync
Obsidian watches the vault directory for filesystem changes. When Obsidian is running, any file you create, edit, or delete is picked up and synced automatically (if Obsidian Sync or a sync plugin is configured). Never modify anything inside .obsidian/ directly.
Filesystem operations
Read a note
cat "$OBSIDIAN_VAULT/path/to/note.md"
List notes
# All notes
find "$OBSIDIAN_VAULT" -name '*.md' -not -path '*/.obsidian/*'
# Notes in a specific folder
ls "$OBSIDIAN_VAULT/folder/"*.md
Create a note
cat > "$OBSIDIAN_VAULT/path/to/note.md" << 'EOF'
---
tags: [topic]
---
Note content here.
EOF
Edit a note (append)
echo "New content" >> "$OBSIDIAN_VAULT/path/to/note.md"
Edit a note (overwrite)
cat > "$OBSIDIAN_VAULT/path/to/note.md" << 'EOF'
Replacement content.
EOF
Search by content
grep -rl "search term" "$OBSIDIAN_VAULT" --include='*.md' | grep -v '.obsidian/'
Search by filename
find "$OBSIDIAN_VAULT" -name '*keyword*' -name '*.md' -not -path '*/.obsidian/*'
Move / rename
mv "$OBSIDIAN_VAULT/old/path.md" "$OBSIDIAN_VAULT/new/path.md"
Note: Moving or renaming files does not automatically update [[wikilinks]] pointing to that note. If the note is linked from others, update those references manually or rely on Obsidian's built-in rename refactoring (which only works when Obsidian performs the rename via its UI).
Delete a note
rm "$OBSIDIAN_VAULT/path/to/note.md"
Manage folders
mkdir -p "$OBSIDIAN_VAULT/new/folder"
rmdir "$OBSIDIAN_VAULT/empty/folder"
Tags, links, and metadata
Find notes with a tag
grep -rl '#tagname' "$OBSIDIAN_VAULT" --include='*.md' | grep -v '.obsidian/'
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.
- 9d ago First seen · 127 lines · 18 tokens per session scan A 466c250a5dd7
obsidian is a skill published in the GitHub repository laude-institute/headlong (1,135 stars, last pushed 4d ago), licensed Apache-2.0. It adds 18 tokens to every session and 1,031 once invoked, about $0.0001 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 2026-08-30.
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