feat: add claude_code.anthropic_provider config for custom model routing

[kilhyeonjun]

Summary

Claude Code agent files (.claude/agents/*.md) use model aliases like opus, sonnet, haiku which are hardcoded to anthropic/ prefix in claude-model-mapper.ts. Users proxying Anthropic models through custom gateways (e.g., Kiro) get Model not found: anthropic/claude-opus-4-6 errors because they don't have an anthropic provider configured.

Changes

Add claude_code.anthropic_provider config option that overrides the default anthropic provider prefix when resolving agent model aliases.

Files Changed

File	Change
src/config/schema/claude-code.ts	Add anthropic_provider field to schema
src/features/claude-code-agent-loader/claude-model-mapper.ts	Accept optional anthropicProvider param, use it instead of hardcoded ANTHROPIC_PREFIX
src/features/claude-code-agent-loader/loader.ts	Pass anthropicProvider through loadAgentsFromDir → mapClaudeModelToOpenCode
src/plugin-handlers/agent-config-handler.ts	Read claude_code.anthropic_provider from config and pass to loaders
src/features/claude-code-agent-loader/claude-model-mapper.test.ts	Add 6 test cases for anthropicProvider override
assets/oh-my-opencode.schema.json	Auto-generated schema update

Example Config

{
  "claude_code": {
    "anthropic_provider": "kiro"
  }
}

Behavior

Input	Without config	With "anthropic_provider": "kiro"
model: opus	anthropic/claude-opus-4-6	kiro/claude-opus-4-6
model: sonnet	anthropic/claude-sonnet-4-6	kiro/claude-sonnet-4-6
model: haiku	anthropic/claude-haiku-4-5	kiro/claude-haiku-4-5
model: claude-opus-4-6	anthropic/claude-opus-4-6	kiro/claude-opus-4-6
model: openai/gpt-5.2	openai/gpt-5.2 (unchanged)	openai/gpt-5.2 (unchanged)

Explicit provider/model format is always preserved regardless of config.

Testing

• 28 unit tests pass (22 existing + 6 new)
• bun run typecheck passes
• bun run build succeeds
• Verified locally with OpenCode + Kiro gateway: all 3 agent types (opus/sonnet/haiku) route correctly through kiro/ provider

---

Summary by cubic

Adds claude_code.anthropic_provider to route Claude Code agent aliases (opus, sonnet, haiku) and bare claude-* models through a custom provider, fixing “Model not found: anthropic/…” errors with gateways like Kiro. Adds validation to prevent malformed provider values.

• New Features

  • Overrides the default anthropic/ prefix for aliases and bare claude-* models.
  • Keeps explicit provider/model strings unchanged.
  • Loader applies the override to user and project agents.
  • Validates anthropic_provider (trimmed, non-empty, no /); added tests.

• Migration

  • Set "claude_code.anthropic_provider": "kiro" (or your gateway) to map model: opus → kiro/claude-opus-4-6.

^{Written for commit 166e104. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 6 files

Confidence score: 3/5

• There is a concrete regression risk in src/config/schema/claude-code.ts: anthropic_provider currently accepts arbitrary strings, and values with whitespace or / can generate malformed model IDs for Claude Code aliases.
• Given the issue’s medium severity (6/10) and high confidence (9/10), this carries user-facing impact in provider/model resolution, so the merge risk is moderate rather than minimal.
• Pay close attention to src/config/schema/claude-code.ts - tighten provider-name validation to prevent malformed alias model IDs.

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="src/config/schema/claude-code.ts">

<violation number="1" location="src/config/schema/claude-code.ts:14">
P2: Validate `anthropic_provider` as a provider name instead of accepting arbitrary strings; whitespace or `/` here produces malformed model IDs for every Claude Code alias.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

0 issues found across 2 files (changes from recent commits).

_{Auto-approved: Safe addition of a config option with clear fallback to default behavior. Tests cover both existing and new functionality, ensuring no regressions.}