What is list:builtin-tools?

A skill that lists the built-in tools available in Claude Code, Anthropic's coding assistant. It also checks configuration files to show tools disabled by permission rules.

Use it to audit Claude Code's tool inventory, including file, command, and other built-in tools, and identify which ones permissions have disabled.

It makes the difference between available, denied, and MCP-connected tools clear. This helps explain why a tool may be missing from a session.

list:builtin-tools — Skill for Claude Code by lttr

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 lttr/claude-marketplace --skill list-builtin-tools

Clone the repo

git clone --depth 1 https://github.com/lttr/claude-marketplace

Made for: Claude Code.

Or install cc, the plugin that ships this one along with the rest of its 8 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/lttr/claude-marketplace/list-builtin-tools/github.svg)](https://agentmods.dev/skills/lttr/claude-marketplace/list-builtin-tools)

Your own site

<a href="https://agentmods.dev/skills/lttr/claude-marketplace/list-builtin-tools"><img src="https://agentmods.dev/badge/skills/lttr/claude-marketplace/list-builtin-tools/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/lttr/claude-marketplace/list-builtin-tools"><img src="https://agentmods.dev/badge/skills/lttr/claude-marketplace/list-builtin-tools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 342 The whole file, excluding the scripts and references it only reads on demand.

Security scan D 2 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00012	$0.00342
Opus 5	$0.00006	$0.00171
Sonnet 5	$0.00002	$0.00068
Haiku 4.5	$0.00001	$0.00034

Measured 11d ago against content hash 0a847b828f56, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade D, and why

list:builtin-tools scanned grade D with 2 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 11d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

1. Read the `permissions.deny` array from each settings file that applies, in order: `~/.claude/settings.json`, `.claude/settings.json`, `.claude/settings.local.json`. Collect bare tool-name entries (e.g. `NotebookEdit`)

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

1. Read the `permissions.deny` array from each settings file that applies, in order: `~/.claude/settings.json`, `.claude/settings.json`, `.claude/settings.local.json`. Collect bare tool-name entries (e.g. `NotebookEdit`)

plugins/cc/skills/list-builtin-tools/SKILL.md · 35 lines

What it actually says

Context

Claude Code has a set of built-in tools that are always available, separate from MCP server tools. Users may want to see what built-in tools are available for reference.

Tools denied via permissions.deny in settings are removed from the session entirely — they never appear in the tool list, not even as deferred tools. So the live tool list alone under-reports what the harness ships: a denied tool looks identical to a tool that doesn't exist. Read the settings files to tell the two apart.

Your task

Read the permissions.deny array from each settings file that applies, in order: ~/.claude/settings.json, .claude/settings.json, .claude/settings.local.json. Collect bare tool-name entries (e.g. NotebookEdit); ignore scoped ones like Bash(rm -rf /*:*), which gate arguments rather than the tool.
List all built-in Claude Code tools (excluding MCP tools that start with mcp__) — both the ones available this session and the ones denied by those settings.

For each tool, provide:

Tool name in backticks
Brief description (one line)
— disabled (deny: <settings file>) suffix if it was denied

Organize by category:

File Operations
Execution & Shell
Web Access
Task Management
Integration

Deferred tools (schemas loaded on demand via ToolSearch) are available — list them normally, not as disabled.

Use compact format with minimal formatting.

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.

11d ago First seen · 35 lines · 12 tokens per session scan D 0a847b828f56

Subscribe to this mod's changes

list:builtin-tools is a skill published in the GitHub repository lttr/claude-marketplace (2 stars, last pushed yesterday), licensed MIT. It adds 12 tokens to every session and 342 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it D with 2 findings (reads agent configuration directories, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents Claude Code claude-ai workflow

stream-chain

Stream-JSON chaining for multi-agent pipelines, data transformation, and sequential workflows.

spencermarx/open-code-review · 18 tokens

hook-factory

Generate production-ready Claude Code hooks with interactive Q&A, automated installation, and enhanced validation. Supports 10 templates across 7 event types for comprehensive workflow automation.

alirezarezvani/claude-code-skill-factory · 36 tokens

html-ppt-hermes-cyber-terminal

OpenDesign + BYOK: choosing and wiring your own model, hands-on — cost, quality, and the routing decision. Built as a decision-grade AI literacy deck for engineers, IT, applied-AI teams.

nexu-io/open-design · 53 tokens

r3f-best-practices

React Three Fiber (R3F) and Poimandres ecosystem best practices. Use when writing, reviewing, or optimizing R3F code. Triggers on tasks involving @react-three/fiber, @react-three/drei, zustand, @react-three/postprocessing, @react-three/rapier, or leva.

zebbern/claude-code-guide · 74 tokens

log-error-digest

Analyze log files to troubleshoot errors, identify peak error periods, and produce error clustering, frequency statistics, and time distribution reports. Supports JSON, syslog, and Nginx formats with automatic detection. Use when a user uploads a .log file and asks to analyze errors, find patterns, debug issues, or…

zebbern/claude-code-guide · 71 tokens

development

An index of programming guidance for Python, Go, Rust, TypeScript, Java, C++, and shell scripting.

fengshao1227/ccg-workflow · 41 tokens

list:builtin-tools