setup(codex/hermes/opencode): mirror Claude skills so non-Claude agents are not skill-blind

CODA bundled 43 skills but only Claude Code consumed them. Codex,
Hermes, and OpenCode were skill-blind — same Databricks knowledge,
exposed to one of the five agents.

setup_gemini.py already did this for Gemini. This PR factors out the
copy logic into a `mirror_claude_skills(target_dir, agent_name)`
utility and calls it from setup_codex.py (-> ~/.codex/skills/),
setup_hermes.py (-> ~/.hermes/skills/), and setup_opencode.py
(-> ~/.local/share/opencode/skills/). Each agent's setup is idempotent
across restarts (target dir is replaced, not appended).

setup_gemini.py is left alone — its inline implementation already
works. A separate cleanup can route Gemini through the same utility
for consistency.

Closes [Discipline Gaps](https://docs.google.com/spreadsheets/d/1_VBK5twTQmMRDSzwDa7JkCN2Rb6xg5HIM-U4jGC5PKU/edit?gid=1103133504#gid=1103133504) row #17.

This PR was prepared by Claude.

Author: jamesbroadhead

setup_codex.py

@@ -13,7 +13,7 @@
 import subprocess
 from pathlib import Path
 
-from utils import adapt_instructions_file, ensure_https, get_gateway_host, get_npm_version
+from utils import adapt_instructions_file, ensure_https, get_gateway_host, get_npm_version, mirror_claude_skills
 
 # Set HOME if not properly set
 if not os.environ.get("HOME") or os.environ["HOME"] == "/":
@@ -93,6 +93,9 @@
 codex_dir = home / ".codex"
 codex_dir.mkdir(exist_ok=True)
 
+# Mirror Claude skills into ~/.codex/skills so Codex sees the same skill content
+mirror_claude_skills(codex_dir / "skills", "Codex")
+
 # Copy bundled Databricks model catalog into ~/.codex so it can be referenced
 # by relative path in config.toml (codex resolves relatives against CODEX_HOME).
 catalog_src = Path(__file__).parent / ".codex" / "databricks-models.json"

setup_hermes.py

@@ -25,7 +25,7 @@
 import subprocess
 from pathlib import Path
 
-from utils import adapt_instructions_file, ensure_https, get_gateway_host
+from utils import adapt_instructions_file, ensure_https, get_gateway_host, mirror_claude_skills
 
 # Opt-out: allow operators to disable Hermes bundling without removing the file.
 if os.environ.get("ENABLE_HERMES", "true").strip().lower() in ("false", "0", "no"):
@@ -58,6 +58,9 @@
 local_bin.mkdir(parents=True, exist_ok=True)
 hermes_home.mkdir(parents=True, exist_ok=True)
 
+# Mirror Claude skills into ~/.hermes/skills so Hermes sees the same skill content
+mirror_claude_skills(hermes_home / "skills", "Hermes")
+
 
 def _run(cmd, **kwargs):
     """Run a subprocess command and return (rc, stdout, stderr)."""

setup_opencode.py

@@ -11,7 +11,7 @@
 import subprocess
 from pathlib import Path
 
-from utils import ensure_https, get_gateway_host, get_npm_version
+from utils import ensure_https, get_gateway_host, get_npm_version, mirror_claude_skills
 
 # content-filter proxy local proxy — sanitizes empty content blocks before reaching Databricks
 # (see https://github.com/sst/opencode/issues/5028)
@@ -278,6 +278,9 @@
 opencode_data_dir = home / ".local" / "share" / "opencode"
 opencode_data_dir.mkdir(parents=True, exist_ok=True)
 
+# Mirror Claude skills into ~/.local/share/opencode/skills so OpenCode sees them
+mirror_claude_skills(opencode_data_dir / "skills", "OpenCode")
+
 if gateway_host:
     auth_data = {
         "databricks": {

utils.py

@@ -4,10 +4,29 @@
 
 import os
 import re
+import shutil
 import subprocess
 from pathlib import Path
 
 
+def mirror_claude_skills(target_dir: Path, agent_name: str) -> None:
+    """Mirror ~/.claude/skills into ``target_dir`` so non-Claude agents see them.
+
+    Replaces ``target_dir`` if it already exists (idempotent across restarts).
+    Resolves the Claude skills directory via ``HOME``, falling back to a no-op
+    if nothing is there (the same shape `setup_gemini.py` uses for Gemini).
+    """
+    home = Path(os.environ.get("HOME", "/app/python/source_code"))
+    claude_skills_dir = home / ".claude" / "skills"
+    if not claude_skills_dir.exists():
+        print(f"No Claude skills at {claude_skills_dir}, skipping {agent_name} mirror")
+        return
+    if target_dir.exists():
+        shutil.rmtree(target_dir)
+    shutil.copytree(claude_skills_dir, target_dir)
+    print(f"Skills mirrored: {claude_skills_dir} -> {target_dir}")
+
+
 def get_npm_version(package_name):
     """Resolve the latest stable version of an npm package.