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| Capability | Aider | Antigravity CLI | Claude Code | OpenAI Codex | Gemini CLI | OpenCode |
|---|---|---|---|---|---|---|
| Root instructions | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| Nested instructions | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| Instruction precedence | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| MCP stdio | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: yes ↗ | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| MCP HTTP | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: yes ↗ | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| Headless execution | ? UNKNOWNDocumented: yes ↗ | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: yes ↗ | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: yes ↗ | ✓ OBSERVEDv1.18.29 · linux x64Documented: yes ↗ |
| Exit semantics | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| Structured output | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: yes ↗ | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| Skill discovery | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: yes ↗ |
| Hook execution | ? UNKNOWNDocumented: unknown | ? UNKNOWNDocumented: unknown | ? UNKNOWNDocumented: unknown | ? UNKNOWNDocumented: unknown | ? UNKNOWNDocumented: unknown | ? UNKNOWNDocumented: unknown |
| Git worktrees | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
| Repository boundary | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.1.27 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv0.153.4 · linux x64Documented: unknown | ? UNKNOWNDocumented: unknown | ✓ OBSERVEDv1.18.29 · linux x64Documented: unknown |
✓ Observed in a completed run× Expected behavior not observed? Insufficient evidenceHow to read these results →