forge-understand

forge-understand is a skill for Claude Code, Codex from SidCorp-co/forge. It costs 60 tokens per session (635 once invoked), scanned A, original, Apache-2.0.

A workflow skill for checking whether an issue is actionable and reproducing a reported bug before planning work. It separates real work from notes, questions, completed items, and duplicates.

In plain words
What is it for?
Use it to triage issue-tracker items, clarify missing completion criteria, and verify bugs with an exact command, request, or click path.
Why use it?
It prevents teams from planning around unclear requests or unverified bug reports. A reproduction records how the failure happened and what output was seen.

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/sidcorp-co/forge/forge-understand
Any agent
npx skills add SidCorp-co/forge --skill forge-understand
Clone the repo
git clone --depth 1 https://github.com/SidCorp-co/forge

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 forge-understand

README.md
[![agentmods](https://agentmods.dev/badge/skills/sidcorp-co/forge/forge-understand.svg)](https://agentmods.dev/skills/sidcorp-co/forge/forge-understand)
Your own site
<a href="https://agentmods.dev/skills/sidcorp-co/forge/forge-understand"><img src="https://agentmods.dev/badge/skills/sidcorp-co/forge/forge-understand.svg" alt="Measured on agentmods" height="20"></a>
Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 635 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 $0.00060 $0.00635
Opus 5 $0.00030 $0.00318
Sonnet 5 $0.00012 $0.00127
Haiku 4.5 $0.00006 $0.00064

Measured 3d ago against content hash 18bb93db21d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

forge-understand 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.

packages/runner/skills/forge-understand/SKILL.md · 63 lines

How it starts

The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.

forge-understand

Two questions, in order. Answer the first wrong and everything after it is wasted; answer the second by guessing and the plan is fiction.

1 · Is this work?

Work has a named deliverable, an owner, and a finish someone other than the author can verify.

Four things arrive in the issue tracker that are not work:

It is actually What you do
a note, a learning, a decision write it to project memory, comment saying where it went, then dropped
a question answer it in a comment; dropped if nothing remains to build
already done verify it against the repo, say so with the commit, then dropped
a duplicate comment naming the original, then dropped

dropped, never closedclosed stamps merged_at and unblocks every dependent as if the work had shipped.

If it is work but you cannot tell what finished looks like, that is needs_info, not a guess.

2 · Reproduce it

Nothing proceeds on a described symptom.

A bug is reproduced when you have run it and seen it fail. Record the exact command, request or click path, and the actual output. "I read the code and it looks wrong" is a hypothesis; it is not reproduction, and it is wrong often enough to matter.

A feature is reproduced when you have found the current behaviour it changes and stated it. If the feature is genuinely new surface with nothing to compare against, say that explicitly rather than skipping the step silently.

If you cannot reproduce it, do not proceed on the assumption that it is real. Comment with exactly what you tried and what happened instead, then needs_info.

What you write

Into the issue, before phase 2:

  • what is wrong, in one sentence a reader who has not read the code can check
  • the reproduction: command or path, expected, actual
  • the acceptance criteria — how anyone will know it is fixed

Acceptance criteria are the reviewer's contract in phase 5. Vague criteria there produce a rubber stamp there. Write them so that a reviewer who has never seen your code can decide pass or fail.

Read the full file on GitHub · 63 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. 3d ago First seen · 63 lines · 60 tokens per session scan A 18bb93db21d4

Subscribe to this mod's changes

forge-understand is a skill published in the GitHub repository SidCorp-co/forge (5 stars, last pushed 3d ago), licensed Apache-2.0. It adds 60 tokens to every session and 635 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 2026-08-31.

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