cf-plan-custom

cf-plan-custom is a skill for Claude Code, Codex from dinhanhthi/coding-friend. It costs 0 tokens per session (2,460 once invoked), scanned A, original, MIT.

A workflow for creating a new Coding Friend skill or agent when a task includes a special flag or clearly asks for one. It first checks whether a new add-on is really needed and then guides its design.

In plain words
What is it for?
Handling requests to create or add a skill, command, or agent, including deciding which type to create and validating the need before planning it.
Why use it?
It prevents accidental creation of unnecessary add-ons and makes the intended type explicit. The flag-based path can skip the normal detection and confirmation steps.

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/dinhanhthi/coding-friend/cf-plan-custom
Any agent
npx skills add dinhanhthi/coding-friend --skill cf-plan-custom
Clone the repo
git clone --depth 1 https://github.com/dinhanhthi/coding-friend

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 cf-plan-custom

README.md
[![agentmods](https://agentmods.dev/badge/skills/dinhanhthi/coding-friend/cf-plan-custom.svg)](https://agentmods.dev/skills/dinhanhthi/coding-friend/cf-plan-custom)
Your own site
<a href="https://agentmods.dev/skills/dinhanhthi/coding-friend/cf-plan-custom"><img src="https://agentmods.dev/badge/skills/dinhanhthi/coding-friend/cf-plan-custom.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,460 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 $0.00000 $0.02460
Opus 5 $0.00000 $0.01230
Sonnet 5 $0.00000 $0.00492
Haiku 4.5 $0.00000 $0.00246

Measured 5d ago against content hash d34471038a77, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cf-plan-custom 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 5d 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.

.coding-friend/skills/cf-plan-custom/SKILL.md · 182 lines

How it starts

The opening of the file, as written. The whole thing — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Before

New Skill/Agent Detection

Force trigger: If the task description contains --skill or --agent flag → strip the flag from the description, pre-select the type (skill or agent) for the Skill Type Decision later, and skip detection + confirmation — go directly to the challenge below.

Auto-detect: Scan the task description for these keyword patterns (case-insensitive):

  • "new skill", "create skill", "add skill", "build skill"
  • "new command", "create command", "add command"
  • "new agent", "create agent", "add agent"

If none of these patterns match → skip this entire Before section and proceed with standard cf-plan.

If a pattern matches → ask the user to confirm: "It looks like you want to create a new Coding Friend skill/agent — is that correct?" If they say no, skip this Before section.

If confirmed → proceed with the challenge below.

Challenge: Is a New Skill Really Needed?

Before planning anything, challenge the idea rigorously. Ask the user these questions using AskUserQuestion (one round, all 5 questions — batched intentionally to minimize back-and-forth since these are validation questions, not discovery):

  1. What specific gap does this fill? What can't you do today with existing skills? Be concrete — "it would be nice" is not a gap.

  2. Can an existing skill be extended instead? Read plugin/context/bootstrap.md at runtime to get the current inventory of skills and agents (do not rely on a hardcoded list — skills change over time). Could any of them be extended with new steps, modes, or flags to cover this use case?

  3. Can existing skills be combined/chained? Could a workflow combining 2-3 existing skills achieve the same result? For example, /cf-scan + /cf-remember or /cf-fix + /cf-review. If yes, a small doc describing the combo may be all that's needed.

  4. Who is the audience? All Coding Friend users (→ plugin skill), only this project (→ custom guide), or only you the creator (→ .claude/skills/)?

Read the full file on GitHub · 182 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. 5d ago First seen · 182 lines · 0 tokens per session scan A d34471038a77

Subscribe to this mod's changes

cf-plan-custom is a skill published in the GitHub repository dinhanhthi/coding-friend (3 stars, last pushed 5d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,460 tokens. 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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