| name | port-antigravity-to-codex |
| description | Port a project's Antigravity configuration to Codex, keeping the Antigravity files in place. Scans the project for Antigravity config artifacts, maps each to its Codex equivalent using the coding-agent-concept-mapping knowledge base, and creates or edits the matching Codex files. Use when migrating a repo from Antigravity to Codex. |
| argument-hint | ["project path"] |
| disable-model-invocation | true |
| allowed-tools | Read, Write, Edit, Glob, Grep, Skill |
Port Antigravity to Codex
Migrates one project's agent configuration from Antigravity (the source) to
Codex (the target). This is a project level port: it touches only files
inside the given project, never global or machine level config. Source files are
preserved. The Codex config is created alongside them, not on top of
them, so a repo ends up configured for both agents.
If the user passed an argument ($ARGUMENTS), treat it as the path to the project
to port. Otherwise use the current working directory.
Do not hardcode the concept list
The set of portable configuration concepts (project prompt, settings, skills,
custom commands, hooks, MCP servers, subagents, permissions, and more) grows over
time. Never rely on a list baked into this skill. The authoritative, current list
lives in the concept mapping knowledge base, which you read fresh every run. All
paths below are relative to this skill's own directory in the toolkit repo, not
to the project being ported.
- Concept roster plus each agent's primary file or location:
../coding-agent-concept-mapping/ref/00-context-index.md. Every concept it lists is in
scope. Its per concept table names the Antigravity and Codex
file or location, so it is both your worklist and your file map.
- Detailed mapping and porting-in notes for one concept: the detail file
../coding-agent-concept-mapping/ref/XY-concept-name.md linked from the index, or invoke
the coding-agent-docs:coding-agent-concept-mapping skill with the concept name.
If a concept is not in the index, it has not been mapped yet. Skip it and note it
in your report; do not invent a mapping.
Procedure
1. Resolve the project
Determine the project root from $ARGUMENTS or the current working directory.
All scanning and all writing stays inside it.
2. Load the concept roster
Read ../coding-agent-concept-mapping/ref/00-context-index.md. For each concept, note the
Antigravity primary file or location and the Codex primary file or
location from its table. This roster is never hardcoded; it comes from the index
every run.
3. Scan for source artifacts
For each concept in the roster, look inside the project for the Antigravity
file or location the index named, using Glob and Grep. Record which concepts are
actually present in this project. Those are the ones to port.
4. Map each present concept
For every concept found, open its detail file
../coding-agent-concept-mapping/ref/XY-concept-name.md (or invoke coding-agent-docs:coding-agent-concept-mapping with the
concept name) and read its aspect tables and the Porting-in notes row for
Codex. When the detail file is thin on a target specific point, consult
the coding-agent-docs:codex-docs skill for the current Codex file format and
field names, and coding-agent-docs:antigravity-docs for the source. Do not migrate from
memory; these tools change often.
5. Execute the migration
Create or edit the Codex file or files named by the mapping,
translating paths, filenames, formats, and field names per the concept detail.
Follow the Codex porting-in notes exactly, since that is where the
friction lives (renamed files, changed field keys, format shifts such as JSON to
TOML). Preserve every Antigravity file untouched: the target config coexists
with the source, it never replaces it.
6. Report
Tell the user, concept by concept: which source artifact was found, which target
file was created or edited, and anything skipped, such as an unmapped concept, a
No equivalent cell, or a detail you could not confirm in the docs.
Rules
- Project level only. Never write outside the project or touch global or
machine level config.
- Never overwrite source files. Source and target configs coexist.
- The concept list comes from the index, never from this skill. Re-read
../coding-agent-concept-mapping/ref/00-context-index.md every run.
- Ground target details in
coding-agent-docs:codex-docs. When the mapping is thin,
check the current docs; do not guess field names or paths.
- A concept absent from the index is out of scope. Skip it and report it.
