Agent skill

Customizing Commands

Creates, edits, and enables Letta Code mod-provided slash commands.

Apache-2.0Auto-check passedAgent Workflows

Install Customizing Commands

skills CLI

$ npx skills add letta-ai/letta-code --skill customizing-commands -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install letta-ai/letta-code customizing-commands --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/letta-code.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/skills/builtin/customizing-commands .claude/skills/customizing-commands && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "customizing-commands" agent skill from https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands into .claude/skills/customizing-commands/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "customizing-commands", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add letta-ai/letta-code --skill customizing-commands -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install letta-ai/letta-code customizing-commands --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/letta-code.git skills-src && mkdir -p .agents/skills && cp -r skills-src/src/skills/builtin/customizing-commands .agents/skills/customizing-commands && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "customizing-commands" agent skill from https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands into .agents/skills/customizing-commands/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "customizing-commands", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add letta-ai/letta-code --skill customizing-commands -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install letta-ai/letta-code customizing-commands --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/letta-code.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/src/skills/builtin/customizing-commands .cursor/skills/customizing-commands && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "customizing-commands" agent skill from https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands into .cursor/skills/customizing-commands/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "customizing-commands", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/letta-ai/letta-code.git --path src/skills/builtin/customizing-commands

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add letta-ai/letta-code --skill customizing-commands -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install letta-ai/letta-code customizing-commands --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/letta-code.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/src/skills/builtin/customizing-commands .gemini/skills/customizing-commands && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "customizing-commands" agent skill from https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands into .gemini/skills/customizing-commands/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "customizing-commands", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install letta-ai/letta-code customizing-commands

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add letta-ai/letta-code --skill customizing-commands -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/letta-code.git skills-src && mkdir -p .github/skills && cp -r skills-src/src/skills/builtin/customizing-commands .github/skills/customizing-commands && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "customizing-commands" agent skill from https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands into .github/skills/customizing-commands/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "customizing-commands", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add letta-ai/letta-code --skill customizing-commands -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install letta-ai/letta-code customizing-commands --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/letta-ai/letta-code.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/src/skills/builtin/customizing-commands .opencode/skills/customizing-commands && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "customizing-commands" agent skill from https://github.com/letta-ai/letta-code/tree/main/src/skills/builtin/customizing-commands into .opencode/skills/customizing-commands/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "customizing-commands", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: customizing-commands
GitHub stars: 3.6k
Token cost: ~908 tokens
SKILL.md length: 323 words
Files: 1
Skills in repo: 25
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Creates, edits, and enables Letta Code mod-provided slash commands.

Works in 5 steps: Inspect ~/.letta/mods/ for related… → Preserve unrelated mod code; create a… → Register with letta.commands.register()… → …
The user asks to add a custom /command
SKILL.md covers First decide whether a command…, Workflow, Default prompt command and Command result types, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Customizing Commands is an agent skill from letta-ai/letta-code. Creates, edits, and enables Letta Code mod-provided slash commands. Use when the user asks to add a custom /command, slash command, command shortcut, scoped conversation-backed command, or command-driven panel behavior.

Its SKILL.md is about 910 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering Hooks and plugins. It works with Letta. The repository describes itself as: Stateful agents that are like people, with memory, identity, and the ability to learn and adapt. The licence is Apache-2.0.

When your agent uses it

The user asks to add a custom /command
Command shortcut
Scoped conversation-backed command
Command-driven panel behavior

Example prompts

“/customizing-commands”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Inspect ~/.letta/mods/ for related command files.
Preserve unrelated mod code; create a focused new file if merging is messy.
Register with letta.commands.register() and guard with letta.capabilities.commands.
Return the unregister function, or a disposer that calls it plus any timer/panel cleanup.
Tell the user the exact file path changed and to run /reload.

What it can do on your machine

Read from SKILL.md and the folder at commit 253a3bc. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Customizing Commands loads about 908 tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 323 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~60
When it runs · the whole SKILL.md, loaded when a task matches: ~908

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from letta-ai/letta-code at commit 253a3bc, republished under its Apache-2.0 licence (© letta-ai). 323 words, ~908 tokens.

Download SKILL.mdSave it as .claude/skills/customizing-commands/SKILL.md (or your agent's skills folder).

name: customizing-commands
description: Creates, edits, and enables Letta Code mod-provided slash commands. Use when the user asks to add a custom /command, slash command, command shortcut, scoped conversation-backed command, or command-driven panel behavior.

Customizing Commands

Use this as the command-specific entrypoint for local mod slash commands. For broader mod work, recipes live in ../creating-mods/references/commands.md, ../creating-mods/references/architecture.md, ../creating-mods/references/ui.md, and ../creating-mods/references/plan-mode.md.

Mod files live in:

text

~/.letta/mods/

Use a focused file name, e.g. ~/.letta/mods/review.ts or ~/.letta/mods/commands.ts.

First decide whether a command is right

User wants	Build
`/foo` sends a prompt or shows local output	Mod command
`/foo` starts a reusable agent workflow	Skill + thin mod command
Agent/model should autonomously call the capability	Mod tool, not a command
Command shows transient progress/results	Mod command + panel
Command needs model output while the main agent is busy	`runWhenBusy: true` command + forked `ctx.conversation`

If the command is a reusable workflow like /goal, put the workflow instructions in a skill and keep the mod command as a small launcher/prompt.

Workflow

Inspect ~/.letta/mods/ for related command files.
Preserve unrelated mod code; create a focused new file if merging is messy.
Register with letta.commands.register() and guard with letta.capabilities.commands.
Return the unregister function, or a disposer that calls it plus any timer/panel cleanup.
Tell the user the exact file path changed and to run /reload.

Default prompt command

export default function activate(letta) {
  if (!letta.capabilities.commands) return;

  return letta.commands.register({
    id: "review",
    description: "Review current git changes",
    args: "[focus]",
    run(ctx) {
      const focus = ctx.args.trim();
      return {
        type: "prompt",
        content: focus
          ? `Review current git changes. Focus on ${focus}.`
          : "Review current git changes. Focus on correctness issues.",
        systemReminder: true,
      };
    },
  });
}

Command result types

type ModCommandResult =
  | { type: "prompt"; content: string; systemReminder?: boolean }
  | { type: "output"; output: string; success?: boolean }
  | { type: "handled" };

prompt: sends content to the agent. Use for normal slash shortcuts.
output: prints local text and does not contact the agent.
handled: command handled its own side effects/UI; common for panel commands.

Rules

Command IDs omit the slash: id: "review", not "/review".
Use lowercase slugs with letters, numbers, and hyphens.
Do not register built-in command IDs.
runWhenBusy: true commands must not return prompt while the main agent is busy; use scoped conversation helpers/panels and return handled.
showInTranscript: false commands should usually return handled, not prompt.
Do not import Letta Code app internals.
Do not do surprising side effects on startup; mods activate on app start and /reload.

More recipes

Simple output command, panel command, busy-safe conversation command: ../creating-mods/references/commands.md
Complex command architecture, state, cleanup: ../creating-mods/references/architecture.md
Panel/status UI patterns: ../creating-mods/references/ui.md
Worked plan-mode command/tool composition: ../creating-mods/references/plan-mode.md

Files

Just SKILL.md in src/skills/builtin/customizing-commands of letta-ai/letta-code.

Open the folder on GitHubat commit 253a3bc

Compare with similar skills

Customizing Commands next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Customizing Commands compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Customizing Commands this skillletta-ai/letta-code	3.6k	—	~908	Automated safety check: Pass	Apache-2.0	today
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official	38k	10 repos	~4.1k	Automated safety check: Notes	Apache-2.0	today
Claude Code Agent Developmentanthropics/claude-plugins-official	38k	7 repos	~2.8k	Automated safety check: Pass	Apache-2.0	today
Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase	10k	11 repos	~3.5k	Automated safety check: Pass	MIT	2 mo ago
Plugin Settings Patternanthropics/claude-plugins-official	38k	7 repos	~3k	Automated safety check: Pass	Apache-2.0	today
MCP Integration for Pluginsanthropics/claude-plugins-official	38k	11 repos	~3.1k	Automated safety check: Pass	Apache-2.0	today

Similar skills

Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
38k GitHub starsUsed in 10 repos~4.1k tokens
Agent WorkflowsAuto-check: notes
Claude Code Agent Development
anthropics/claude-plugins-official
Official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
38k GitHub starsUsed in 7 repos~2.8k tokens
Agent WorkflowsAuto-check passed
Claude Code Skill Developer Guide
diet103/claude-code-infrastructure-showcase
A guide to creating and managing Claude Code skills with auto-activation: skill-rules.json triggers, hooks, enforcement levels, YAML frontmatter and progressive disclosure.
10k GitHub starsUsed in 11 repos~3.5k tokens
Agent WorkflowsAuto-check passed
Plugin Settings Pattern
anthropics/claude-plugins-official
Official
Shows how Claude Code plugins keep per-project settings and state in .claude/plugin-name.local.md files with YAML frontmatter and a markdown body.
38k GitHub starsUsed in 7 repos~3k tokens
Agent WorkflowsAuto-check passed
MCP Integration for Plugins
anthropics/claude-plugins-official
Official
Explains how to bundle Model Context Protocol servers in a Claude Code plugin, covering config files, stdio, SSE, HTTP and WebSocket server types, and authentication.
38k GitHub starsUsed in 11 repos~3.1k tokens
Agent WorkflowsAuto-check passed
Claude Code Command Development
anthropics/claude-plugins-official
Official
Explains how to write Claude Code slash commands: Markdown files with YAML frontmatter, arguments, file references, bash context and interactive prompts.
38k GitHub starsUsed in 10 repos~4.8k tokens
Agent WorkflowsAuto-check passed

Questions about Customizing Commands

What does Customizing Commands do?

Creates, edits, and enables Letta Code mod-provided slash commands. Customizing Commands is an agent skill from letta-ai/letta-code. Creates, edits, and enables Letta Code mod-provided slash commands.

When should I use Customizing Commands?

Customizing Commands fits situations like: the user asks to add a custom /command; command shortcut; scoped conversation-backed command; command-driven panel behavior.

How do I install Customizing Commands in Claude Code?

Run `npx skills add letta-ai/letta-code --skill customizing-commands -a claude-code`. Or copy the skill folder (src/skills/builtin/customizing-commands in letta-ai/letta-code) into .claude/skills/customizing-commands in your project. Claude Code loads it when a task matches its description.

How do I install Customizing Commands in Codex?

Run `npx skills add letta-ai/letta-code --skill customizing-commands -a codex`. Or copy the skill folder (src/skills/builtin/customizing-commands in letta-ai/letta-code) into .agents/skills/customizing-commands in your project. Codex loads it when a task matches its description.

Can I use Customizing Commands in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add letta-ai/letta-code --skill customizing-commands -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/customizing-commands, .gemini/skills/customizing-commands, .github/skills/customizing-commands and .opencode/skills/customizing-commands in your project.

What does Customizing Commands need to run?

SKILL.md names no scripts, command-line tools or credentials: Customizing Commands is instructions for the agent only.

Does Customizing Commands access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Customizing Commands safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Customizing Commands use?

Customizing Commands is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Customizing Commands use?

About 908 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Customizing Commands?

Skills that share tags, products or a category with Customizing Commands: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars) and Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Customizing Commands?

letta-ai (a GitHub organization) maintains it in letta-ai/letta-code, which has 3,552 GitHub stars. The repository holds 25 skills in this directory. The repository was last updated on October 9, 2026.

Source: letta-ai/letta-code on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Customizing Commands

Install Customizing Commands

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Customizing Commands

First decide whether a command is right

Workflow

Default prompt command

Command result types

Rules

More recipes

Files

Compare with similar skills

Similar skills

Hook Development for Claude Code Plugins

Claude Code Agent Development

Claude Code Skill Developer Guide

Plugin Settings Pattern

MCP Integration for Plugins

Claude Code Command Development

More from letta-ai/letta-code

Creating Skills

Generating Mod Envs

Initializing Memory

Self Configuration

Browser Use

Creating Mods

Questions about Customizing Commands

Install Customizing Commands

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Customizing Commands

First decide whether a command is right

Workflow

Default prompt command

Command result types

Rules

More recipes

Files

Compare with similar skills

Similar skills

More from letta-ai/letta-code

Related

Questions about Customizing Commands