feature-radar-learn

feature-radar-learn is a skill for Claude Code, Codex from runkids/feature-radar. It costs 210 tokens per session (820 once invoked), scanned A, original, MIT.

A learning tool that records reusable patterns, design decisions, mistakes, and techniques from completed development work in `.feature-radar/specs/`. Each item is assigned to one of four categories: Pattern, Decision, Pitfall, or Technique.

In plain words
What is it for?
Use it to review recent work, capture why an approach was chosen, document mistakes to avoid, and build a reference of techniques that worked.
Why use it?
Important reasoning is often lost after a feature, bug fix, refactor, or investigation is finished. This keeps the lessons available for future coding sessions.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install

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.

agentmods
npx agentmods add skills/runkids/feature-radar/feature-radar-learn
Any agent
npx skills add runkids/feature-radar --skill feature-radar-learn
Clone the repo
git clone --depth 1 https://github.com/runkids/feature-radar

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for feature-radar-learn

README.md
[![agentmods](https://agentmods.dev/badge/skills/runkids/feature-radar/feature-radar-learn.svg)](https://agentmods.dev/skills/runkids/feature-radar/feature-radar-learn)
Your own site
<a href="https://agentmods.dev/skills/runkids/feature-radar/feature-radar-learn"><img src="https://agentmods.dev/badge/skills/runkids/feature-radar/feature-radar-learn.svg" alt="Measured on agentmods" height="20"></a>
Per session 210 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 820 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00210 $0.00820
Opus 5 $0.00105 $0.00410
Sonnet 5 $0.00042 $0.00164
Haiku 4.5 $0.00021 $0.00082

Measured 6d ago against content hash f3c0631997f4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

feature-radar-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 6d 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.

skills/feature-radar-learn/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Extract Learnings

Capture reusable knowledge from completed work into .feature-radar/specs/.

Deep Read

Behavioral Directives

Workflow

  1. Identify the source — ask the user what was just completed (feature, bug fix, refactor, investigation)
  2. Analyze the work — review recent commits, changed files, and implementation decisions
  3. Extract knowledge — identify what's reusable:
    • Patterns: recurring solutions worth replicating (e.g., "three-tier config merge")
    • Decisions: architectural choices with rationale (e.g., "YAML over JSON because...")
    • Pitfalls: mistakes or dead ends others should avoid
    • Techniques: implementation approaches that worked well

Before writing to specs/, classify each piece of knowledge into exactly one category:

  • Pattern: recurring solution worth replicating
  • Decision: architectural choice with rationale
  • Pitfall: mistake or dead end to avoid
  • Technique: implementation approach that worked well

State the classification explicitly in your output.

  1. Write to specs — create or append to .feature-radar/specs/{topic}.md
  2. Checkpoint — State what was written and ask: "I've written to specs/{topic}.md ({classification type}). Does this look correct, or should I adjust anything?" Wait for user confirmation before proceeding.
  3. Update base.md — increment the specs count in Tracking Summary

File Format

Use the format defined in ../feature-radar/references/SPEC.md § 3.4 (specs/{topic}.md).

Guidelines

  • One topic per file. If the learning spans multiple topics, create multiple files.
  • Name files by the pattern, not by the feature that produced it.
    • Good: yaml-config-merge.md, symlink-vs-copy-tradeoffs.md
    • Bad: audit-feature-learnings.md, v2-refactor-notes.md
  • Append to existing files when the new learning extends a known topic.
  • Keep it concise — future readers need the insight, not the full story.

Read the full file on GitHub · 81 lines

Changes

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.

  1. 6d ago First seen · 81 lines · 210 tokens per session scan A f3c0631997f4

Subscribe to this mod's changes

feature-radar-learn is a skill published in the GitHub repository runkids/feature-radar (13 stars, last pushed 6mo ago), licensed MIT. It adds 210 tokens to every session and 820 once invoked, about $0.0011 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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