create-custom-agent SKILL.md skillA
create-custom-agent from dotnet/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dotnet/skills/create-custom-agent@git:20260205.8bbd012Pins git:20260205.8bbd012 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dotnet/skills
- Path
.agents/skills/create-custom-agent/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260205.8bbd012, committed Feb 5, 2026
- Size
- 7,599 bytes
- Repository stars
- 5,788
- License
- MIT
Creates VS Code custom agent files (.agent.md) for specialized AI personas with tools, instructions, and handoffs. Use when scaffolding new custom agents, configuring agent workflows, or setting up agent-to-agent handoffs.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Create Custom Agent This skill helps you create VS Code custom agent files that define specialized AI personas for development tasks. Custom agents configure which tools are available, provide specialized instructions, and can chain together via handoffs. ## When to Use - Creating a new custom agent from scratch - Scaffolding an `.agent.md` file with proper frontmatter - Setting up agent-to-agent handoffs for multi-step workflows - Configuring tool restrictions for specialized roles (planner, reviewer, etc.) - Creating workspace-shared or user-profile agents ## When Not to Use - Creating instruction files (use `.instructions.md` instead) - Creating reusable prompts (use `.prompt.md` instead) - Modifying existing agents (edit the file directly) ## Inputs | Input | Required | Description | |-------|----------|-------------| | Agent name | Yes | Descriptive name for the agent (e.g., `planner`, `code-reviewer`) | | Description | Yes | Brief description shown as placeholder text in chat | | Purpose/Persona | Yes | What role the agent plays and how it should behave | | Tools | Recommended | List of tools or tool sets the agent can use | …
Read the whole file at its exact version.
How to install
mdr add dotnet/skills/create-custom-agent@sha256:7c32d6ef0fb7d2caThe line at the top of this page pins the label git:20260205.8bbd012, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_xnvmz64lggdu66mo)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Feb 5, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7599 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
dotnet/skills · 5,788 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xnvmz64lggdu66mo GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/create-custom-agent GET https://markdownregistry.com/api/v1/blob/7c32d6ef0fb7d2ca26edbd3fe6ce69dfc5046e4085051af6a54cb09ac36e5f76
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.