duplicate skill name WARN on every workspace: symlink ~/.claude/skills → ~/.agents/skills is not inode-deduped; nested remotion-best-practices SKILL.md collides

Description

OpenCode 1.18.25 (Desktop, macOS) logs WARN duplicate skill name on every workspace boot, not once per process. Two distinct collisions:

1. Same skill, two roots, often the same inode. ~/.claude/skills/<name> is a symlink to ~/.agents/skills/<name> (standard Claude + Codex layout). Discovery still treats them as two skills and warns. followSymlinks: true plus no realpath/inode check.

   Example from this machine (already a symlink):

   WARN duplicate skill name name=codex-security-scan
     existing=/Users/…/.claude/skills/codex-security-scan/SKILL.md
     duplicate=/Users/…/.agents/skills/codex-security-scan/SKILL.md
   

2. Recursive glob inside a skill package. ~/.agents/skills/remotion-best-practices/{remotion-create,remotion-markup,…}/SKILL.md has the same frontmatter name as the sibling top-level ~/.agents/skills/remotion-create/SKILL.md. {skill,skills}/**/SKILL.md indexes both.

This is not the TUI-vs-Desktop which winner bug (#35153) and not only the non-deterministic last-writer (#32202). The user-visible failure here is a warning flood (once per open workspace) and a prompt-cache miss risk from unstable <location> bytes. Related closed: #29950.

OPENCODE_DISABLE_CLAUDE_CODE_SKILLS=1 is an undocumented workaround for (1) only. It is env-only (not in opencode.json schema). It does not fix (2). There is no config key to skip Claude roots while keeping ~/.agents/skills.

Plugins

oh-my-openagent@latest (warnings are service=skill / OpenCode core, not the plugin)

OpenCode version

Desktop 1.18.25; CLI 1.18.10

Steps to reproduce

1. Install the same skill in both Claude and Agents roots as a symlink:

   mkdir -p ~/.agents/skills/example
   echo $'---\nname: example\ndescription: demo\n---\n' > ~/.agents/skills/example/SKILL.md
   ln -s ~/.agents/skills/example ~/.claude/skills/example
   

2. Also copy a nested package layout:

   mkdir -p ~/.agents/skills/pkg/example
   cp ~/.agents/skills/example/SKILL.md ~/.agents/skills/pkg/example/SKILL.md
   

3. Start OpenCode Desktop (or opencode) from any project.
4. Open more than one recent workspace.

Expected

• Same inode / symlink pair: index once, no WARN.
• Nested **/SKILL.md under another skill directory: do not register as a second skill of the same name, or warn once with a stable winner by documented precedence.
• A opencode.json flag equivalent to OPENCODE_DISABLE_CLAUDE_CODE_SKILLS.

Actual

• WARN for every colliding name, repeated for every workspace instance.
• Winner is last writer (see #32202).
• Desktop has no config-file way to opt out of ~/.claude/skills without also dropping ~/.agents/skills (OPENCODE_DISABLE_EXTERNAL_SKILLS=1).

Operating System

macOS

Terminal

OpenCode Desktop