forge-plan

An implementation-planning step for clarified Forge issues. It explores the codebase and records a step-by-step plan showing which files and existing patterns are relevant.

In plain words
What is it for?
Use it to plan changes for issues of different sizes, from small targeted edits to work that needs deeper codebase investigation.
Why use it?
It gives the person or coding agent implementing the issue a concrete path to follow. The plan helps reduce blind exploration, wrong architectural choices, and rework.

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

Made for: Claude Code, Codex.

Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,667 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 $0.00095 $0.03667
Opus 5 $0.00048 $0.01834
Sonnet 5 $0.00019 $0.00733
Haiku 4.5 $0.00010 $0.00367

Measured 2d ago against content hash 5d6454bb3d1d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

forge-plan 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 2d 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/core/skills/forge-plan/SKILL.md · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Forge Plan

This is the planning step in the issue pipeline: clarified → approved (it runs after triage and clarify). Its job is to turn a triaged, reproduced issue into a concrete implementation plan that a coding agent (or developer) can follow without re-exploring the codebase.

Planning is the highest-value step in the pipeline. A good plan saves the coding step from wasting tokens on exploration, wrong turns, and rework. A bad plan (or no plan) means the coding agent explores blindly, makes architectural mistakes, and produces code that needs heavy review.

Usage

/forge-plan <documentId>

Tools

forge_issues, forge_comments, plus codebase exploration tools (Read, Glob, Grep).

Two-Tier Planning

Not every issue needs deep codebase exploration. The planning depth should match the complexity:

Lightweight plan (xs/s/m): Use project knowledge (forge_knowledge) + issue description + targeted Glob to identify files and write the plan. Read at most 1-2 source files — only when you need to check an existing pattern or verify a component's current props/API. The coding agent will read the files during implementation anyway, so duplicate deep-reading wastes tokens.

Deep plan (l/xl): Full codebase exploration. Read all affected files, trace dependencies, verify patterns. l/xl issues involve architectural decisions where a wrong plan costs more than the exploration.

The tier is determined by the triage comment's complexity classification.

Workflow

Pull-model note: On large issues forge_step_start returns a lean manifest (bodyTruncated:true). Fetch plan/description/acceptanceCriteria as needed via forge_issues.get { documentId, fields: ['description', 'acceptanceCriteria'] } rather than assuming full body is present.

Step 1: Fetch Issue & Triage Context

Fetch the issue and its comments in parallel:

forge_issues → get → { documentId: "<id>" }
forge_comments → list → { filters: { issue: "<documentId>" } }
forge_config → get

Read the full file on GitHub · 213 lines

Files

What ships with it

4 files 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. 2d ago First seen · 213 lines · 95 tokens per session scan A 5d6454bb3d1d

Subscribe to this mod's changes

forge-plan is a skill published in the GitHub repository SidCorp-co/forge (5 stars, last pushed 3d ago), licensed Apache-2.0. It adds 95 tokens to every session and 3,667 once invoked, about $0.0005 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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