add-tool

add-tool is a skill for Claude Code, Codex from caioreix/agency-cli. It costs 59 tokens per session (3,446 once invoked), scanned A, original, MIT.

A development workflow for adding support for a new AI tool or code editor to agency-cli, a command-line program for managing tool configurations.

In plain words
What is it for?
Use it to add a converter for a tool or IDE, including project-wide or user-wide settings for macOS, Linux, and Windows.
Why use it?
It provides the research, code changes, tests, registration, documentation, and checks needed to support another tool consistently across operating systems.

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/caioreix/agency-cli/add-tool
Any agent
npx skills add caioreix/agency-cli --skill add-tool
Clone the repo
git clone --depth 1 https://github.com/caioreix/agency-cli

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 add-tool

README.md
[![agentmods](https://agentmods.dev/badge/skills/caioreix/agency-cli/add-tool.svg)](https://agentmods.dev/skills/caioreix/agency-cli/add-tool)
Your own site
<a href="https://agentmods.dev/skills/caioreix/agency-cli/add-tool"><img src="https://agentmods.dev/badge/skills/caioreix/agency-cli/add-tool.svg" alt="Measured on agentmods" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,446 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 $0.00059 $0.03446
Opus 5 $0.00030 $0.01723
Sonnet 5 $0.00012 $0.00689
Haiku 4.5 $0.00006 $0.00345

Measured 4d ago against content hash a7a8362d68e5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

add-tool 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 4d 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.

.github/skills/add-tool/SKILL.md · 420 lines

How it starts

The opening of the file, as written. The whole thing — 420 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mission

You are a senior Go developer specialised in the agency-cli codebase. When asked to add support for a new tool, you carry out the full implementation end-to-end: research, code, tests, registration, and verification.

Steps to follow — in order:

  1. Research — Search the tool's official documentation. Find: how it loads AI agents / custom instructions / rules / skills; the expected file format; and where config files live on macOS, Linux, and Windows.
  2. Plan — Decide scope (project vs global), paths per OS, and file format.
  3. Implement — Create internal/converter/<toolname>.go.
  4. Test — Create internal/converter/<toolname>_test.go.
  5. Register — Update internal/installer/installer.go, internal/converter/converter.go, and cmd/root.go.
  6. Document — Update README.md Supported Tools table.
  7. Verify — Run go test ./... and make lint and confirm everything passes.

Project Layout

internal/
  converter/
    converter.go          ← registry, Converter interface, SupportedTools
    <toolname>.go         ← one file per tool
    <toolname>_test.go
  installer/
    installer.go          ← DestinationDir switch
cmd/
  root.go                 ← --tool flag description

Converter Interface

type Converter interface {
    Convert(a *agent.Agent, destDir string, scope string) ([]string, error)
    Name() string          // display name, e.g. "My Tool"
    Description() string   // install path shown in `agency-cli tools`
    IsProjectScoped() bool
}

Register via init():

func init() { //nolint:gochecknoinits // required by cobra/converter
    Register("toolname", &myTool{})
}

Agent Fields

type Agent struct {
    Name        string // e.g. "DevOps Engineer"
    Description string // one-line summary
    Color       string // e.g. "cyan", "blue"
    Emoji       string // e.g. "🤖"
    Vibe        string // short personality note
    Tools       string // comma-separated tool list
    Category    string // directory category
    Slug        string // kebab-case, e.g. "devops-engineer"
    Body        string // full markdown body after frontmatter
    FilePath    string // source path
}

Read the full file on GitHub · 420 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. 4d ago First seen · 420 lines · 59 tokens per session scan A a7a8362d68e5

Subscribe to this mod's changes

add-tool is a skill published in the GitHub repository caioreix/agency-cli (4 stars, last pushed 5mo ago), licensed MIT. It adds 59 tokens to every session and 3,446 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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