Load subagent names from agents/ markdown files

[OZoneGuy]

Summary

• Extend readSubagentNames to load agents from agents/*.md next to the OpenCode config, in addition to the agent section in opencode.json
• Parse markdown frontmatter for mode and disable, merge with JSON-defined agents (directory wins on name clash), and keep existing subagent selection behavior
• Add unit tests for directory-only agents, merge/override, and disabled markdown agents

Test plan

• bun test tests/unit/mcp-config.test.ts

Made with Cursor

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I have my agents defined in markdown files for opencode, https://opencode.ai/docs/agents/#markdown, and they are not picked up by the plugin. Adding code to pick up the markdown agents.

[Nomadcxx]

FYI, three follow-ups that align this with how OpenCode itself loads agents (packages/opencode/src/config/agent.ts). I will push them on top of your branch so this PR carries them.

1. Read agent/ as well as agents/. OpenCode globs {agent,agents}/**/*.md, so anyone on the singular agent/ layout gets nothing from the current code. This is the main gap.

2. Recurse into subdirectories. The flat readdirSync skips nested agent files, and the basename-only name can differ from the path-based name OpenCode uses.

3. Handle quoted and alternate frontmatter values. mode: "subagent" keeps its quotes under the current regex and stops matching subagent, and disable: "true" or disable: yes slips past the exact === "true" check. Strip the quotes and accept the truthy forms. No YAML dependency, so your regex approach stays.

Commits to follow. Thanks for kicking this off.

[Nomadcxx]

Pushed the three fixes as a commit on top. Covered by unit tests and a real-filesystem test that writes agent/ and agents/ trees to disk (with a nested agent) and reads them back, so the recursive readdirSync and path-based naming run for real, not just against mocks.

Still needs a live check before merge: confirm that in a running OpenCode session the discovered names actually reach the task tool, so the model can spawn an agent defined only in agent/foo.md. The loader is verified end to end at the filesystem layer; the path through OpenCode subagent selection is not, since that needs a real session.