add-tool

add-tool is a skill for Claude Code from umbraco/Umbraco-MCP-Base. It costs 46 tokens per session (1,699 once invoked), scanned A, original, MIT.

A workflow for adding a new API operation to an existing MCP tool collection. It creates the tool and updates the collection index, with optional tests.

In plain words
What is it for?
Use it when an API endpoint or collection operation is missing, after the collection and generated API client already exist. You can target a collection and optionally describe the operation to add.
Why use it?
It avoids manually wiring a new endpoint into an existing collection and helps keep implementation and coverage changes together.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Part of the umbraco-mcp-skills plugin — 13 skills, 7 agents shipped together

Good fit Use it when an API endpoint or collection operation is missing, after the collection and generated API client already exist. You can target a collection and optionally describe the operation to add.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/umbraco/umbraco-mcp-base/add-tool
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 umbraco/Umbraco-MCP-Base --skill add-tool
Clone the repo
git clone --depth 1 https://github.com/umbraco/Umbraco-MCP-Base

Made for: Claude Code.

Or install umbraco-mcp-skills, the plugin that ships this one along with the rest of its 13 skills, 7 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 add-tool

README.md
[![agentmods](https://agentmods.dev/badge/skills/umbraco/umbraco-mcp-base/add-tool/github.svg)](https://agentmods.dev/skills/umbraco/umbraco-mcp-base/add-tool)
Your own site
<a href="https://agentmods.dev/skills/umbraco/umbraco-mcp-base/add-tool"><img src="https://agentmods.dev/badge/skills/umbraco/umbraco-mcp-base/add-tool/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 add-tool

Your own site · 80×15
<a href="https://agentmods.dev/skills/umbraco/umbraco-mcp-base/add-tool"><img src="https://agentmods.dev/badge/skills/umbraco/umbraco-mcp-base/add-tool.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,699 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00046 $0.01699
Opus 5.5 $0.00018 $0.00680
Sonnet 5.5 $0.00009 $0.00340
Haiku 4.5 $0.00005 $0.00170

Measured 2mo ago against content hash 44b7853a9d9f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-tool scanned grade A with 1 finding 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 2mo 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -sk {swaggerUrl}
plugins/umbraco-mcp-skills/skills/add-tool/SKILL.md · 176 lines

How it starts

The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add Tool

Add one or more new tools to an existing MCP collection. This skill handles creating the tool file, updating the collection index, and optionally adding integration tests and eval tests.

Use this skill when:

  • A new API endpoint has been added and needs a tool
  • You want to expose an additional operation from an existing collection
  • /build-tools skipped the collection because it already has an index.ts

Prerequisites

Before running, ensure:

  1. The collection already exists (src/umbraco-api/tools/{collection}/index.ts)
  2. The API client has been generated (src/umbraco-api/api/generated/ exists — if not, run npm run generate)
  3. The project compiles: npm run compile

Arguments

  • Collection name (required): the collection to add the tool to (e.g. /add-tool form)
  • Operation hint (optional): a description of the endpoint to add (e.g. /add-tool form "copy form endpoint")

If no arguments are provided, ask the user which collection and what endpoint to add.

Agents

This skill orchestrates the following agents:

Agent When to use
mcp-tool-creator Creating the tool file (Step 3)
mcp-tool-description-writer Writing the tool description (Step 3)
mcp-tool-reviewer Reviewing the new tool for LLM-readiness (Step 5)
integration-test-creator Creating an integration test for the new tool (Step 6)
eval-test-creator Updating eval tests to cover the new tool (Step 7)

Critical Rules

ONE TOOL AT A TIME. Create one tool file, compile, verify, then move to the next if adding multiple.

RUN COMMANDS SEPARATELY. Always run compile and test as separate Bash calls. Never chain with &&.

DO NOT RECREATE EXISTING INFRASTRUCTURE. The collection index, test setup, builders, and helpers already exist. This skill only adds new files and updates existing ones.

Workflow

Step 0: Understand the Request

Read the arguments to determine:

  • Which collection to add to
  • What endpoint(s) to add

Read the full file on GitHub · 176 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. 2mo ago First seen · 176 lines · 46 tokens per session scan A 44b7853a9d9f

Subscribe to this mod's changes

add-tool is a skill published in the GitHub repository umbraco/Umbraco-MCP-Base (2 stars, last pushed yesterday), licensed MIT. It adds 46 tokens to every session and 1,699 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

add-tool compared with skills from other repositories

add-tool next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
add-toolumbraco/Umbraco-MCP-BaseSkill2yesterdayMITA46Claude Code
imagegenopenai/codexSkill135ktodayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill100ktodayApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill80k6d agoMITA200Claude Code, Codex
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
chat-pet-sprite-creationmicrosoft/vscodeSkill195ktodayMITA53Claude Code, Codex