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Agent skill

Composer Dev Env

by dxos in dxos/dxos

Run a local Composer against the shared EDGE dev environment over HTTPS at https://local.composer.space/, sign in with a passkey, and connect the dev MCP server (mcp.dev.dxos.network) so the agent…

Custom licenceAuto-check passedAgent Workflows

Install Composer Dev Env

skills CLI
$ npx skills add dxos/dxos --skill composer-dev-env -a claude-code

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

GitHub CLI
$ gh skill install dxos/dxos composer-dev-env --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/dxos/dxos.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/composer-dev-env .claude/skills/composer-dev-env && 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/

Facts

Skill name
composer-dev-env
GitHub stars
525
Token cost
~1.3k tokens
SKILL.md length
590 words
Files
1
Skills in repo
41
Repo updated
First seen
Licence
Custom licence

At a glance

Run a local Composer against the shared EDGE dev environment over HTTPS at https://local.composer.space/, sign in with a passkey, and connect the dev MCP server (mcp.dev.dxos.network) so the agent…

  • Works in 4 steps: Certificate (once per machine) → Serve against dev on port 443 → Account and passkey (the user does this) → …
  • Asked to point local Composer at dev
  • SKILL.md covers 1. Certificate (once per…, 2. Serve against dev on port 443, 3. Account and passkey (the… and 4. Connect the dev MCP, plus 3 more sections
  • Calls npx, claude and curl; reaches local.composer.space and dev.dxos.network

What it does

Composer Dev Env is an agent skill from dxos/dxos. Run a local Composer against the shared EDGE dev environment over HTTPS at https://local.composer.space/, sign in with a passkey, and connect the dev MCP server (mcp.dev.dxos.network) so the agent can read and write the same dev spaces. Use when asked to point local Composer at dev, to work against the dev MCP, to set up the local HTTPS cert, or when the dev MCP answers whoami but lists no operations.

Its SKILL.md is about 1.3k 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 MCP servers. It works with Model Context Protocol. The repository describes itself as: TypeScript implementation of the DXOS protocols, SDK, toolchain and Composer.

When your agent uses it

  • Asked to point local Composer at dev
  • Work against the dev MCP
  • Set up the local HTTPS cert
  • The dev MCP answers whoami but lists no operations

Example prompts

  • “/composer-dev-env”

Requirements

  • Node.js

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Certificate (once per machine)
  2. Serve against dev on port 443
  3. Account and passkey (the user does this)
  4. Connect the dev MCP

What it can do on your machine

Read from SKILL.md and the folder at commit f0fc12a. 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

    Shell commands in SKILL.md call:

    • npx
    • claude
    • curl
    • pnpm
    • wrangler

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • local.composer.space
    • dev.dxos.network
    • account.dev.composer.space
    • mcp.dev.dxos.network

    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

Composer Dev Env loads about 1.3k tokens when it runs. Until then it costs about 106 tokens; SKILL.md has 590 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~106
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 590 words (~1,330 tokens).

“The chain is: local Composer (HTTPS, trusted cert) → EDGE dev (hub, auth, sync) → dev MCP server reading the same identity's spaces. The dxos plugin's composer MCP points at production (composer.dxos.network/mcp); the dev MCP is a separate server and…”

— opening of SKILL.md by dxos, Custom licence
name
composer-dev-env

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/composer-dev-env of dxos/dxos.

Open the folder on GitHubat commit f0fc12a

Compare with similar skills

Composer Dev Env 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.

Composer Dev Env compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Composer Dev Env this skilldxos/dxos525—~1.3kAutomated safety check: PassCustom licence
MCP Server Builderanthropics/skills180k64 repos~2.3kAutomated safety check: PassApache-2.0
MCP Server BuildershareAI-lab/learn-claude-code78k5 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Fastmcp Client CLIPrefectHQ/fastmcp28k1 repos~823Automated safety check: PassApache-2.0
Crush Configurationcharmbracelet/crush29k—~3.7kAutomated safety check: PassCustom licence

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  • Autocue

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Works with

Categories

Questions about Composer Dev Env

What does Composer Dev Env do?

Run a local Composer against the shared EDGE dev environment over HTTPS at https://local.composer.space/, sign in with a passkey, and connect the dev MCP server (mcp.dev.dxos.network) so the agent…. Composer Dev Env is an agent skill from dxos/dxos.network) so the agent can read and write the same dev spaces.

When should I use Composer Dev Env?

Composer Dev Env fits situations like: asked to point local Composer at dev; work against the dev MCP; set up the local HTTPS cert; the dev MCP answers whoami but lists no operations.

How do I install Composer Dev Env in Claude Code?

Run `npx skills add dxos/dxos --skill composer-dev-env -a claude-code`. Or copy the skill folder (.agents/skills/composer-dev-env in dxos/dxos) into .claude/skills/composer-dev-env in your project. Claude Code loads it when a task matches its description.

How do I install Composer Dev Env in Codex?

Run `npx skills add dxos/dxos --skill composer-dev-env -a codex`. Or copy the skill folder (.agents/skills/composer-dev-env in dxos/dxos) into .agents/skills/composer-dev-env in your project. Codex loads it when a task matches its description.

Can I use Composer Dev Env 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 dxos/dxos --skill composer-dev-env -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/composer-dev-env, .gemini/skills/composer-dev-env, .github/skills/composer-dev-env and .opencode/skills/composer-dev-env in your project.

What does Composer Dev Env need to run?

Going by SKILL.md and its folder, Composer Dev Env needs the command-line tools its instructions call (npx, claude, curl, pnpm and wrangler). Our summary lists: Node.js.

Does Composer Dev Env access the network?

SKILL.md names 4 domains. In commands or code: local.composer.space, dev.dxos.network, account.dev.composer.space and mcp.dev.dxos.network; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is Composer Dev Env 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 Composer Dev Env use?

Composer Dev Env has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Composer Dev Env use?

About 1.3k tokens (SKILL.md is roughly 5.3k 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 Composer Dev Env?

Skills that share tags, products or a category with Composer Dev Env: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Fastmcp Client CLI (PrefectHQ/fastmcp, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Composer Dev Env?

dxos (a GitHub organization) maintains it in dxos/dxos, which has 525 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 8, 2026.

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