epic-dev

epic-dev is a skill for Claude Code, Codex from neuromechanist/research-skills. It costs 84 tokens per session (1,746 once invoked), scanned A, original, BSD-3-Clause.

A workflow for delivering large software features in several phases, using GitHub issues, pull requests, branches, and separate workspaces for each phase.

In plain words
What is it for?
Use it to plan and deliver multi-phase features, create related GitHub sub-issues, manage phase branches or worktrees, run checks, and prepare pull requests.
Why use it?
It organizes work that is too large for one change and keeps progress, reviews, tests, and cleanup tracked across phases.

Skill for Claude CodeCodex

Written for Claude Code and Codex: shipped in a Claude Code plugin, but also agents/openai.yaml present. Also seen: mentions Claude Code; mentions Codex.

Part of the project plugin — 15 skills, 5 commands, 3 agents shipped together

Good fit Use it to plan and deliver multi-phase features, create related GitHub sub-issues, manage phase branches or worktrees, run checks, and prepare pull requests.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/neuromechanist/research-skills/epic-dev
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.

Any agent
npx skills add neuromechanist/research-skills --skill epic-dev
Clone the repo
git clone --depth 1 https://github.com/neuromechanist/research-skills

Made for: Claude Code, Codex.

Or install project, the plugin that ships this one along with the rest of its 15 skills, 5 commands, 3 agents.

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 epic-dev

README.md
[![agentmods](https://agentmods.dev/badge/skills/neuromechanist/research-skills/epic-dev/github.svg)](https://agentmods.dev/skills/neuromechanist/research-skills/epic-dev)
Your own site
<a href="https://agentmods.dev/skills/neuromechanist/research-skills/epic-dev"><img src="https://agentmods.dev/badge/skills/neuromechanist/research-skills/epic-dev/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.

agentmods 80×15 button for epic-dev

Your own site · 80×15
<a href="https://agentmods.dev/skills/neuromechanist/research-skills/epic-dev"><img src="https://agentmods.dev/badge/skills/neuromechanist/research-skills/epic-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,746 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
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 Memory Poisoning · line 135
    Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.
    Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
How audits are shown
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 $0.00084 $0.01746
Opus 5 $0.00042 $0.00873
Sonnet 5 $0.00017 $0.00349
Haiku 4.5 $0.00008 $0.00175

Measured 11d ago against content hash 957a6346a8ac, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

epic-dev 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 11d 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/project/skills/epic-dev/SKILL.md · 141 lines

How it starts

The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Epic Development Workflow

Codex entrypoint for the same phased epic workflow exposed to Claude Code as /epic-dev. Use workflow-reference for command snippets, state shape, and variation details, then follow this procedure as the execution contract.

Operating Rules

  • Execute repository detection, GitHub lookups, worktree setup, tests, commits, PR creation, and cleanup directly when prerequisites are valid.
  • Ask before strategic points only: epic plan approval, per-phase implementation plan approval, critical review decisions, and final epic merge.
  • Use absolute paths in shell commands. Do not rely on a previous cd.
  • Track progress with the active planning tool when available.
  • Do not use codex/ branch prefixes. Prefer feature/issue-{N}-..., patch/..., or chore/... per project rules.
  • Do not use emojis in issues, PRs, commits, or generated state.
  • Keep the lead on Sol (or the strongest available model) for epic design, observation, approvals, supervision, load-bearing verification, and final synthesis. Use Terra only to elaborate an approved phase architecture, and Luna for detailed implementation, focused review, and validation. Escalate unresolved design or high-risk invariants per agent-fanout.
  • Semantic line breaks remain the default for prose source, except GitHub issue and pull-request bodies. In GitHub bodies, keep each paragraph on one source line, separate paragraphs with blank lines, and do not insert sentence- or clause-level newlines inside a paragraph.

Phase 0: Repository Detection

  1. Run project-detect-repo-config from the target repository.
  2. Validate required values before continuing:
    • INTEGRATION_BRANCH
    • REPO_ROOT
    • CURRENT_BRANCH
  3. Stop and report the exact error if ERROR is set or required values are empty.
  4. Validate GitHub CLI access. If HAS_GH=false or GH_ERROR is set, tell the user what to fix and stop.
  5. If HAS_GH_SUBISSUE=false, install gh-sub-issue with gh extension install agbiotech/gh-sub-issue after normal approval rules for networked commands.
  6. Read existing state from .claude/epic.local.md if present. New Codex runs may continue using that file for compatibility with the Claude command.

Read the full file on GitHub · 141 lines

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. 11d ago First seen · 141 lines · 84 tokens per session scan A 957a6346a8ac

Subscribe to this mod's changes

epic-dev is a skill published in the GitHub repository neuromechanist/research-skills (45 stars, last pushed 8d ago), licensed BSD-3-Clause. It adds 84 tokens to every session and 1,746 once invoked, about $0.0004 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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