Convert .local.md Settings for OpenCode and Codex

Overview

PR #124 introduces .claude/compound-engineering.local.md — a YAML frontmatter settings file that workflow commands (review.md, work.md) read at runtime to decide which agents to run. The conversion script already handles agents, commands, skills, hooks, and MCP servers. It does not handle .local.md settings files.

The question: can OpenCode and Codex support this same pattern? And what does the converter need to do?

Analysis: What .local.md Actually Does

The settings file does two things:

1. YAML frontmatter with structured config: review_agents: [list], plan_review_agents: [list]
2. Markdown body with free-text instructions passed to review agents as context

The commands (review.md, work.md) read this file at runtime using the Read tool and use the values to decide which Task agents to spawn. This is prompt-level logic — it's instructions in the command body telling the AI "read this file, parse it, act on it."

Key Insight: This Already Works

The converter already converts review.md and work.md command bodies verbatim (for OpenCode) or as generated skills (for Codex). The instructions that say "Read .claude/compound-engineering.local.md" are just markdown text inside the command body. When the converter outputs them:

• OpenCode: The command template includes the full body. The AI reads it, follows the instructions, reads the settings file.
• Codex: The command becomes a prompt + generated skill. The skill body includes the instructions. The AI reads it, follows the instructions, reads the settings file.

The .local.md file itself is not a plugin component — it's a runtime artifact created per-project by the user (via /compound-engineering-setup). The converter doesn't need to bundle it.

What Needs Attention

1. Setup Command Has disable-model-invocation: true

setup.md has disable-model-invocation: true. The converter already handles this correctly:

• OpenCode (claude-to-opencode.ts:117): Skips commands with disableModelInvocation
• Codex (claude-to-codex.ts:22): Filters them out of prompts and generated skills

This means /compound-engineering-setup won't be auto-invocable in either target. That's correct — it's a deliberate user action. But it also means users of the converted plugin have no way to run setup. They'd need to manually create the .local.md file.

2. The .local.md File Path Is Claude-Specific

The commands reference .claude/compound-engineering.local.md. In OpenCode, the equivalent directory is .opencode/. In Codex, it's .codex/. The converter currently does no text rewriting of file paths inside command bodies.

3. Slash Command References in Config-Aware Sections

The commands say things like "Run /compound-engineering-setup to create a settings file." The Codex converter already transforms /command-name → /prompts:command-name, but since setup has disable-model-invocation, there's no matching prompt. This reference becomes a dead link.

4. Task {agent-name}(...) Syntax in Review Commands

review.md uses Task {agent-name}(PR content) — the Codex converter already transforms these to $skill-name references. OpenCode passes them through as template text.

Proposed Solution

Phase 1: Add Settings File Path Rewriting to Converters

Both converters should rewrite .claude/ paths inside command bodies to the target-appropriate directory.

File: src/converters/claude-to-opencode.ts

Add a transformContentForOpenCode(body) function that replaces:

• .claude/compound-engineering.local.md → .opencode/compound-engineering.local.md
• ~/.claude/compound-engineering.local.md → ~/.config/opencode/compound-engineering.local.md

Apply it in convertCommands() to the command body before storing as template.

File: src/converters/claude-to-codex.ts

Extend transformContentForCodex(body) to also replace:

• .claude/compound-engineering.local.md → .codex/compound-engineering.local.md
• ~/.claude/compound-engineering.local.md → ~/.codex/compound-engineering.local.md

Phase 2: Generate Setup Equivalent for Each Target

Since setup.md is excluded by disable-model-invocation, the converter should generate a target-native setup instruction that tells users how to create the settings file.

Option A: Include setup as a non-auto-invocable command anyway (recommended)

Change the converters to include disable-model-invocation commands but mark them appropriately:

• OpenCode: Include in command map but add a manual: true flag or comment
• Codex: Include as a prompt (user can still invoke it manually via /prompts:compound-engineering-setup)

This is the simplest approach — the setup instructions are useful even if not auto-triggered.

Option B: Generate a README/instructions file

Create a compound-engineering-settings.md file in the output that documents how to create the settings file for the target platform. More complex, less useful.

Recommendation: Option A — just stop filtering out disable-model-invocation commands entirely. Both OpenCode and Codex support user-invoked commands/prompts. The flag exists to prevent Claude from auto-invoking during conversation, not to hide the command entirely.

Phase 3: Update Tests

File: tests/converter.test.ts

• Add test that .claude/ paths in command bodies are rewritten to .opencode/ paths
• Update existing disable-model-invocation test to verify the command IS included (if Option A)

File: tests/codex-converter.test.ts

• Add test that .claude/ paths are rewritten to .codex/ paths
• Add test that setup command is included as a prompt (if Option A)
• Add test that slash command references to setup are preserved correctly

Phase 4: Add Fixture for Settings-Aware Command

File: tests/fixtures/sample-plugin/commands/settings-aware-command.md

---
name: workflows:review
description: Run comprehensive code reviews
---

Read `.claude/compound-engineering.local.md` for agent config.
If not found, use defaults.
Run `/compound-engineering-setup` to create settings.

Test that the converter rewrites the paths and command references correctly.

Acceptance Criteria

• OpenCode converter rewrites .claude/ → .opencode/ in command bodies
• Codex converter rewrites .claude/ → .codex/ in command/skill bodies
• Global path ~/.claude/ rewritten to target-appropriate global path
• disable-model-invocation commands are included (not filtered) in both targets
• Tests cover path rewriting for both targets
• Tests cover setup command inclusion
• Existing tests still pass

What We're NOT Doing

• Not bundling the .local.md file itself (it's user-created per-project)
• Not converting YAML frontmatter format (both targets can read .md files with YAML)
• Not adding target-specific setup wizards (the instructions in the command body work across all targets)
• Not rewriting AskUserQuestion tool references (all three platforms support equivalent interactive tools)

Complexity Assessment

This is a small change — mostly string replacement in the converters plus updating the disable-model-invocation filter. The .local.md pattern is prompt-level instructions, not a proprietary API. It works anywhere an AI can read a file and follow instructions.