feat(agent): support custom baseURL for Claude Code workspaces

[MarsKubeX]

When a model ID includes a base URL (provider::model::baseURL), write ANTHROPIC_BASE_URL into .claude/settings.json so Claude Code routes requests to the custom endpoint. This enables local inference engines (e.g. llama-server) and API proxies.

Part of openkaiden/kaiden#1855

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✅ All modified and coverable lines are covered by tests.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 335ae405-c8b4-4f97-b5e1-44a8dc657b7f

📥 Commits

Reviewing files that changed from the base of the PR and between 5140445 and 6fdea5b.

📒 Files selected for processing (2)

• pkg/agent/claude.go
• pkg/agent/claude_test.go

📝 Walkthrough

Walkthrough

SetModel method in claudeAgent now accepts a containerHost parameter to rewrite localhost-based Anthropic API base URLs to container DNS names. The implementation parses modelID, extracts the base URL component, and conditionally rewrites HTTP addresses via the containerurl package while preserving remote URLs. Test coverage validates all rewriting paths, conditional env block creation, and existing environment variable preservation.

Changes

Claude Agent Container Host URL Configuration

Layer / File(s)	Summary
Container host URL rewriting implementation pkg/agent/claude.go	Method signature updated to accept containerHost parameter; containerurl import added; SetModel extended to parse modelID format (model name and optional base URL), rewrite localhost addresses with containerHost, and store rewritten URL in config["env"]["ANTHROPIC_BASE_URL"].
URL rewriting test coverage pkg/agent/claude_test.go	Existing TestClaude_SetModel_ProviderModelURLFormat enhanced to assert env["ANTHROPIC_BASE_URL"] contains host-rewritten URL. Added tests for localhost-to-container rewriting, remote HTTPS URL preservation, conditional env block omission when no base URL present, and existing environment variable preservation during ANTHROPIC_BASE_URL injection.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• openkaiden/kdn#392: Both PRs modify claudeAgent.SetModel to interpret modelID format in .claude/settings.json (PR #392 normalizes provider ::model[::url] format; this PR injects ANTHROPIC_BASE_URL via containerHost rewriting).

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title accurately describes the main change: adding support for custom baseURL configuration for Claude Code workspaces via the SetModel method.
Description check	✅ Passed	The description is directly related to the changeset, explaining how model IDs with base URLs are now handled and the intended use cases for local inference engines and API proxies.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@pkg/agent/claude.go`:
- Around line 238-247: When baseURL is empty we must clear a stale
ANTHROPIC_BASE_URL in the model config so a previous custom endpoint doesn't
persist; in the function containing this block (e.g., SetModel / the code using
config and env variables in pkg/agent/claude.go) detect the case where baseURL
== "" and remove the ANTHROPIC_BASE_URL key from the env map (obtained from
config["env"]) if it exists, then write the env map back into config["env"];
keep the existing behavior when baseURL != "" that sets
env["ANTHROPIC_BASE_URL"] to the resolvedURL.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6982bde0-2f86-4324-aea5-6baa8a12186c

📥 Commits

Reviewing files that changed from the base of the PR and between d251318 and 5140445.

📒 Files selected for processing (2)

• pkg/agent/claude.go
• pkg/agent/claude_test.go

[MarsKubeX]

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