2.6 KiB
Codex Tool Mapping
Skills speak in actions ("dispatch a subagent", "create a todo", "read a file"). On Codex these resolve to the tools below.
| Action skills request | Codex equivalent |
|---|---|
| Read a file | shell (e.g., cat, head, tail) — Codex reads files via shell |
| Create / edit / delete a file | apply_patch (structured diff for create, update, delete) |
| Run a shell command | shell |
| Search file contents | shell (e.g., grep, rg) |
| Find files by name | shell (e.g., find, ls) |
| Fetch a URL | shell with curl / wget — Codex has no native fetch tool |
| Search the web | web_search (enabled by default; configurable in config.toml via the top-level web_search setting — live, cached, or disabled) |
| Invoke a skill | Skills load natively — just follow the instructions |
Dispatch a subagent (Subagent (general-purpose): template) |
spawn_agent (see Subagent dispatch requires multi-agent support) |
| Multiple parallel dispatches | Multiple spawn_agent calls in one response |
| Wait for subagent result | wait_agent |
| Free up subagent slot when done | close_agent |
| Task tracking ("create a todo", "mark complete") | update_plan |
Subagent dispatch requires multi-agent support
Add to your Codex config (~/.codex/config.toml):
[features]
multi_agent = true
This enables spawn_agent, wait_agent, and close_agent for skills like dispatching-parallel-agents and subagent-driven-development.
Environment Detection
Skills that create worktrees or finish branches should detect their environment with read-only git commands before proceeding:
GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
BRANCH=$(git branch --show-current)
GIT_DIR != GIT_COMMON→ already in a linked worktree (skip creation)BRANCHempty → detached HEAD (cannot branch/push/PR from sandbox)
See using-git-worktrees Step 0 and finishing-a-development-branch
Step 1 for how each skill uses these signals.
Codex App Finishing
When the sandbox blocks branch/push operations (detached HEAD in an externally managed worktree), the agent commits all work and informs the user to use the App's native controls:
- "Create branch" — names the branch, then commit/push/PR via App UI
- "Hand off to local" — transfers work to the user's local checkout
The agent can still run tests, stage files, and output suggested branch names, commit messages, and PR descriptions for the user to copy.