Borrowing it
Nothing to install: this file belongs to FilipNowakowicz/nixos-config. 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/FilipNowakowicz/nixos-config/main/.agents/skills/capture-learning-candidate/SKILL.mdgit clone --depth 1 https://github.com/FilipNowakowicz/nixos-configWrote 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/filipnowakowicz/nixos-config/capture-learning-candidate)<a href="https://agentmods.dev/skills/filipnowakowicz/nixos-config/capture-learning-candidate"><img src="https://agentmods.dev/badge/skills/filipnowakowicz/nixos-config/capture-learning-candidate/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/filipnowakowicz/nixos-config/capture-learning-candidate"><img src="https://agentmods.dev/badge/skills/filipnowakowicz/nixos-config/capture-learning-candidate.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 | $0.00042 | $0.00763 |
| Opus 5 | $0.00021 | $0.00381 |
| Sonnet 5 | $0.00008 | $0.00153 |
| Haiku 4.5 | $0.00004 | $0.00076 |
Grade A, and why
capture-learning-candidate 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 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.
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 — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Capture Learning Candidate
When work surfaces something a future agent should know, record one compact
candidate under .agents/learning/candidates/. Candidates are machine-routed
proposals reviewed later by a human-gated reviewer — see
.agents/learning/README.md. Capturing a candidate must never change agent
behavior on its own.
When to capture (high bar)
File a candidate only when all hold:
- The lesson is reusable across future sessions, not a one-off fact.
- You have verifiable evidence (commit,
file:line, failing check output, or a direct user correction). - It is not already encoded in
CLAUDE.md,lib/invariants.nix, a test, a hook, or an existing skill.
Strong triggers: a user correction of how you worked; a validation gate
(scripts/validate.sh, merge-gate) catching something a careful agent would
have avoided; a non-obvious repo gotcha you only learned by hitting it; or a
repo/CI fix that should become a durable check, hook, skill, or doc update.
When NOT to capture
- One-off or session-only context (belongs in your normal summary, nowhere else).
- Anything already covered by docs, invariants, tests, hooks, or skills.
- Ephemeral user/preference facts better suited to auto-memory.
- A lesson you cannot back with evidence.
Prefer fewer, higher-signal candidates. Skipping is the default.
Workflow
- Do not scan candidate bodies. Build 3-6 query terms from the issue shape, file paths, commands, CI job, host, or hook involved.
- Run
bash .agents/learning/scripts/query-candidates.sh <terms>.- If it returns a likely duplicate, open only that candidate file and update it in place.
- If it returns nothing relevant, create a new candidate.
- Copy
.agents/learning/TEMPLATE.ymlto.agents/learning/candidates/<date>-<kebab-slug>.yml. - Fill the required fields with terse, grep-friendly values:
route:implement-fix,promote-memory,promote-skill,promote-hook,promote-doc, orreject.best_form: strongest viable artifact, preferring executable checks over hooks, hooks over skills, and skills over prose docs.evidence,observation,proposed_upgrade, plusdate/expires/status. The optional fields (triggers,targets,dedupe_key,type,risk,agent) are commented out in the template — add one only when it adds real routing signal. Do not pad fields to look thorough.
- Mention the captured candidate's path in your work summary.
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 · 68 lines · 42 tokens per session scan A 22b12e8bff68
capture-learning-candidate is a skill published in the GitHub repository FilipNowakowicz/nixos-config (5 stars, last pushed 5d ago), licensed MIT. It adds 42 tokens to every session and 763 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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