extension-foundry

extension-foundry is a skill for Claude Code, Codex from sdfdu/evopilot. It costs 34 tokens per session (392 once invoked), scanned A, original, MIT.

A skill for turning repeated, successful agent workflows into reviewed, versioned extensions such as Agent Skills. It uses recorded observations to decide when a pattern is reliable enough to promote.

In plain words
What is it for?
Use it to analyze workflow history, identify proven patterns, compile and validate candidate skills, and test them separately before installation.
Why use it?
It prevents one-off successes from becoming automatic behavior and adds review, testing, rollback, and comparison with the previous workflow.

Skill for Claude CodeCodex

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/sdfdu/evopilot/extension-foundry
Any agent
npx skills add sdfdu/evopilot --skill extension-foundry
Clone the repo
git clone --depth 1 https://github.com/sdfdu/evopilot

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 extension-foundry

README.md
[![agentmods](https://agentmods.dev/badge/skills/sdfdu/evopilot/extension-foundry.svg)](https://agentmods.dev/skills/sdfdu/evopilot/extension-foundry)
Your own site
<a href="https://agentmods.dev/skills/sdfdu/evopilot/extension-foundry"><img src="https://agentmods.dev/badge/skills/sdfdu/evopilot/extension-foundry.svg" alt="Measured on agentmods" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 392 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 $0.00034 $0.00392
Opus 5 $0.00017 $0.00196
Sonnet 5 $0.00007 $0.00078
Haiku 4.5 $0.00003 $0.00039

Measured 3d ago against content hash e969a55ea0af, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

extension-foundry 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 3d 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.

plugins/evopilot/skills/extension-foundry/SKILL.md · 22 lines

What it actually says

Extension Foundry

Evolve capability through promotion, testing, and rollback rather than uncontrolled self-modification.

  1. Run evopilot_analyze_sequences; use evopilot_analyze_habits only to inspect individual actions. Ignore patterns supported by fewer than three observations.
  2. At three observations, describe a candidate workflow. At five with at least three successful outcomes, it becomes draft_ready. At eight with at least three successes, consider it stable.
  3. Prefer a Skill when existing tools are sufficient. Add a deterministic script for repeatable mechanics.
  4. Draft an MCP server only when live data, authentication, controlled external actions, or a missing tool genuinely requires one.
  5. Use evopilot_compile_skill only for a draft_ready or stable fingerprint, then run evopilot_validate_skill. Review both SKILL.md and evopilot.json, keep the bundle uninstalled, version it, and test it in an isolated workspace. Treat structural validation as a pre-review check, not proof that the workflow executes correctly.
  6. Compare success rate, retries, corrections, time, and user acceptance against the previous workflow.
  7. Never automatically activate generated Skills. Require human review after validation, and require human approval before installing or enabling MCP, adding credentials, expanding access, or publishing.
  8. Roll back when the new workflow performs worse or routes unrelated requests.

Never modify EvoPilot's approval policy through learned behavior. Explicit user instructions outrank learned memories.

When the PreToolUse gate blocks an exact action, show its approval ID and ask the user. Call evopilot_authorize_once only after the user explicitly confirms that action, then retry it once.

Files

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.

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. 3d ago First seen · 22 lines · 34 tokens per session scan A e969a55ea0af

Subscribe to this mod's changes

extension-foundry is a skill published in the GitHub repository sdfdu/evopilot (2 stars, last pushed 4d ago), licensed MIT. It adds 34 tokens to every session and 392 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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