[RaphaelFakhri]

What changed

modelsEndpoint() now appends /v1/models to the configured Anthropic base URL, the same way the OpenAI branch appends /models. Before this change, it resolved the absolute path /v1/models against the base URL, which dropped any path the base URL had.

Fixes #189.

Why

Anthropic-compatible providers often serve their API under a path. For example, z.ai uses https://api.z.ai/api/anthropic. With that base URL, setup probed https://api.z.ai/v1/models?limit=1 instead of https://api.z.ai/api/anthropic/v1/models?limit=1. The probe returned 404 and setup failed with Model route verification failed with HTTP 404, even though the route works.

The default https://api.anthropic.com base URL still resolves to https://api.anthropic.com/v1/models?limit=1.

Verification

• pnpm test passes (pnpm test:unit: 61 files, 2384 tests passed)
• pnpm lint passes
• pnpm knip passes
• If this adds a matcher: ran it against at least one real repo and confirmed the candidate count is sane (not applicable)

pnpm -r build also passes. The new verifyModelRouteWithFetch test with a pathful base URL fails on main (Received: "https://api.z.ai/v1/models?limit=1") and passes with this change.

Notes for reviewer

A trailing slash on the base URL is removed before the path is appended, so https://host/api/anthropic and https://host/api/anthropic/ probe the same endpoint.

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[auto-maintain]

🤖 auto-maintain review

Automated, advisory triage for @RaphaelFakhri's PR. Facts below are read from the GitHub API.

Check	Result
Author's merged PRs (this repo)	0 — ⚠️ first-time contributor
Account established	✅ (age 1048d · 5 followers · 469 public repos)
Commits signed/verified	⚠️ 0/1

Review panel: 🟢 low highest severity

deepsec maintainer code review: 🟢 low

No actionable defects found in the complete base-to-head diff.

General code review: 🟢 low

No actionable defects found in the complete base-to-head diff.

Scanner and matcher quality: 🟢 low

No actionable issues found in the complete diff.

Sandbox and credential boundaries: 🟢 low

Path-preserving Anthropic probe matches the in-VM proxy's UPSTREAM+req.url forwarding and leaves host validation, redirect:error, and the egress/header-injection policy intact; no credential-boundary or correctness issues found.

Durability and distributed state: 🟢 low

No actionable durability or distributed-state issues found.

_{Posted by auto-maintain. This automated code review is advisory; a human maintainer makes the call.}