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/agentic-development/adev-plugin/learnnpx skills add agentic-development/adev-plugin --skill learngit clone --depth 1 https://github.com/agentic-development/adev-pluginWhat 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 | $0.00067 | $0.02392 |
| Opus 5 | $0.00034 | $0.01196 |
| Sonnet 5 | $0.00013 | $0.00478 |
| Haiku 4.5 | $0.00007 | $0.00239 |
Grade A, and why
adev:learn 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.
How it starts
The opening of the file, as written. The whole thing — 231 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Capture a Heuristic
Explicit user-driven capture of lessons the automated lifecycle missed. Takes a free-text lesson and distills it into a structured heuristic entry in .context-index/memory/heuristics/.
Announce at start: "I'm using the /adev:learn skill to capture this lesson as a heuristic."
Arguments
- (positional): Free-text lesson or rule. Examples:
/adev:learn "always run tests before committing hook changes"/adev:learn "the repomap parser chokes on re-exports — use named exports"
--module <module>: Target module scope (e.g.,hooks,cli). If omitted, infer from context or ask.--anti-pattern <text>: Explicit counter-rule ("don't do this"). If omitted, attempt to derive one.--list: List all heuristics, optionally filtered by--module.--promote <id>: Promote a heuristic's confidence one level up.--demote <id>: Demote a heuristic's confidence one level down.--archive <id> --reason <text>: Archive a heuristic with a reason.
Prerequisites
.context-index/must exist. If not, stop and suggest/adev:init.- The adev plugin's
lib/heuristics.mjsmust be accessible (it provides the storage API). Derive the plugin root from this skill file's base directory by stripping theskills/<name>/suffix. Use<ADEV_ROOT>/lib/heuristics.mjsfor imports.
Step 1: Parse Input
If the user provided a positional argument, use it as the raw lesson text.
If no argument was provided, ask:
What lesson should I capture? Describe:
- What to do (or what not to do)
- Why (what went wrong or what worked)
Wait for the user's response.
Load Skill Extensions: Load any skill extension instructions before proceeding:
adev skill-ext load --skill learn
If the output is not __NONE__, incorporate it as additional standing instructions that apply to this skill's entire execution. Frame it as: "The following skill extension instructions apply to this invocation (source: installed domain extensions and/or project-level overrides)." If the output is __NONE__, continue normally.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 231 lines · 67 tokens per session scan A 125c1b56a079
adev:learn is a skill published in the GitHub repository agentic-development/adev-plugin (11 stars, last pushed 3d ago), licensed MIT. It adds 67 tokens to every session and 2,392 once invoked, about $0.0003 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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