The closest existing per-agent profiles include OpenCode V2 and Claude Code Markdown files with YAML frontmatter. Goose has YAML Recipes. OpenClaw has an experimental Claw package, not a single YAML file. Each format has its own runtime; tool rules do not replace Pod or sandbox isolation.

Per-agent native profiles and the chat-first exception

OpenCode V2

A file at .opencode/agents/<name>.md has YAML frontmatter and a Markdown body used as its system prompt. The frontmatter includes model, mode (primary, subagent, or all) and an ordered permissions list of action/resource/effect rules. This is a documented profile for one named agent; opencode run --agent <name> or the server API can drive it. Version matters: V2 uses permissions; legacy V1 examples with permission should not be copied into V2. A selected primary agent does not automatically change the session's selected model. The rules gate OpenCode tools, while Pod and sandbox configuration must constrain the actual process and network. Agent format | CLI | Permissions

Claude Code

A file at .claude/agents/<name>.md similarly carries YAML frontmatter and a Markdown role. Native fields cover tools, disallowedTools, model, permission mode and MCP servers. It can be selected as the main agent in a headless claude --agent <name> -p ... invocation. This is a Claude Code runtime schema, and its permissions are not a substitute for container isolation. Custom subagents | CLI reference

Goose Recipe

A Recipe is YAML/JSON for a repeatable Goose run, with instructions, model, extensions/MCP servers and tool selection. It is an existing language, but it is a launch recipe rather than a complete infrastructure access policy. It can be useful if the controller creates short-lived runs for chat requests. Recipe reference

OpenClaw and experimental Claws

OpenClaw already routes agents from channels, including an official Buzz plugin for team rooms. Its established agent registry is JSON5 with separate workspace instructions. The experimental Claws package instead has a CLAW.md manifest with YAML frontmatter and portable role text, plus profiles/openclaw.yml for model, subagents and allowed or denied tools. It is a native package with validation and lifecycle commands, not a single YAML file. Host credentials, channel bindings and some runtime policy remain outside the package; it requires OPENCLAW_EXPERIMENTAL_CLAWS=1. The documented Buzz route binds rooms to agents; arbitrary mention-based selection among multiple agents within one room still needs verification. Claws CLI | Agents config | Buzz

These four options do not require a new agent language. They have different integration boundaries: OpenCode/Claude/Goose need a chat adapter, whereas OpenClaw includes one. None implies a separate owner of the human team's tasks.