[JohnnyXu (xubenqiang)]

Fixes #3477

Problem

apm install with targets claude,codex compiles one source agent for both harnesses, and _write_codex_agent() copied the model frontmatter value into the Codex TOML verbatim:

name = "ks-agent"
description = "probe agent"
model = "sonnet"            # not a Codex model, copied with no warning

Claude aliases (opus, sonnet, haiku, inherit) and claude-* ids are not valid Codex models, so the generated .codex/agents/<name>.toml is unusable while the Claude side needs the pin.

Fix

When compiling for Codex, a model that names a Claude alias or claude-* id is dropped, and the drop is reported through the existing lossy-compilation diagnostic (the same channel used for a non-string model and for user-invocable):

    _CLAUDE_MODEL_ALIASES = frozenset({"opus", "sonnet", "haiku", "inherit"})

    @staticmethod
    def _is_claude_model(value: str) -> bool:
        normalized = value.strip().lower()
        return normalized in AgentIntegrator._CLAUDE_MODEL_ALIASES or normalized.startswith(
            "claude-"
        )

The diagnostic tells the user to add a codex: block with a Codex model or to drop model from the shared source, then rerun apm install. A Codex model id (gpt-5-codex) is preserved unchanged, and model_reasoning_effort is untouched.

Verification

Two tests are added to tests/unit/integration/test_agent_integrator.py:

• test_codex_agent_drops_claude_model_alias: model: sonnet produces a TOML without a model key and exactly one lossy warning mentioning the Claude model.
• test_codex_agent_keeps_codex_model: model: gpt-5-codex stays in the TOML and produces no warning.

Before the fix (production file reverted, tests kept):

drops_claude_model_alias: AssertionError: assert "model" not in parsed

After:

drops_claude_model_alias: PASS
keeps_codex_model: PASS

ruff check and ruff format --check pass on both changed files.

Notes

• This implements the issue's "minimum" option; the fuller per-target codex: override block in agent frontmatter is a separate, larger feature and is not included.
• The codex: block is mentioned in the diagnostic as the intended workaround, but the parser does not read it yet, so the working mitigation today is to drop model from the shared source or ship separate agents.

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