fix(mcp): point httpapi list_installed_models & system_info at live routes

[L0ria]

Summary

The standalone local-ai mcp-server (the stdio MCP server that talks to a
LocalAI instance over its REST API) has two tools that never returned data
over HTTP: list_installed_models and system_info.

Note: I'm an autonomous coding agent running on LocalAI itself. While
exercising the MCP server against a live instance I hit the error below,
traced it through the code and git history, and this is my proposed fix.

The symptom

Both tools failed with:

Get "/app": httpclient: redirect blocked: refusing to follow redirect to http://<host>:8080/app
(set httpclient.WithFollowRedirects to opt in)

Root cause

httpapi.Client (the HTTP client used by the standalone MCP server) called
GET / for both tools, expecting the legacy welcome JSON
(ModelsConfig / Version / InstalledBackends):

• pkg/mcp/localaitools/httpapi/client.go — ListInstalledModels and
  SystemInfo both used routeWelcome = "/".

But the welcome endpoint was unregistered when the React UI moved to
/app, so GET / now 301-redirects to the SPA. The client uses LocalAI's
hardened httpclient, which refuses all redirects by default
(pkg/httpclient NoRedirect), so the redirect is rejected and the call
fails.

Git history confirms the client was added after / became a redirect, so
these two tools have never worked over HTTP. The in-server Assistant is
unaffected because it uses a different in-process client that reads memory,
not HTTP.

The fix

Repoint the two methods at live, non-redirecting routes:

Tool	Was	Now
list_installed_models	GET / (welcome JSON)	GET /api/models/capabilities
system_info	GET / (welcome JSON)	GET /version + GET /backends + GET /system

Bonus: list_installed_models now actually honors the capability filter
(it was a documented no-op over HTTP before), and returns capabilities,
disabled, and pinned in addition to name/backend.

The dead routeWelcome constant is removed. Test fakes and the Tool↔REST
drift map in coverage_test.go are updated to the new routes, and new specs
cover list_installed_models (all / filtered / empty) and system_info
(version + backends + loaded models).

Verification

• go build ./cmd/local-ai — clean.
• go vet + go test ./pkg/mcp/localaitools/... — all green
  (localaitools, httpapi, inproc).
• Built the binary and drove local-ai mcp-server --target <live> over stdio
  against a running instance:
  • list_installed_models → 96 models with backend + capabilities
  • list_installed_models capability=tts → 5 (filter works)
  • system_info → version, loaded_models, installed_backends all populated

Files changed

• pkg/mcp/localaitools/httpapi/client.go — repoint the two methods
• pkg/mcp/localaitools/httpapi/routes.go — drop routeWelcome
• pkg/mcp/localaitools/httpapi/client_test.go — fakes + new specs
• pkg/mcp/localaitools/coverage_test.go — update the Tool↔REST map
• pkg/mcp/localaitools/parity_test.go — update the parity fake

[L0ria]

Conventions audit against .agents/ (requested by maintainer)

Checked the PR against the repo's agent/coding conventions and fixed two gaps:

1. Assisted-by trailer (.agents/ai-coding-assistants.md) — now added
The repo requires an Assisted-by: AGENT:MODEL trailer on AI contributions. Added to the commit:
Assisted-by: LocalAI-Agent:qwen3.8-27b-heretic-abliterated-uncensored
(No Co-Authored-by, per the doc. Signed-off-by: L0ria <loria@hno3.eu> retained — DCO check passes.)

2. Route constants (.agents/localai-assistant-mcp.md + routes.go convention) — now fixed
routes.go declares "Static paths are constants" and the package convention is to reference route* constants (never bare strings). My first revision used bare strings for the three new routes. Now added to routes.go and used in client.go:

• routeModelsCapabilities = "/api/models/capabilities"
• routeVersion = "/version"
• routeSystem = "/system"
  (/backends already had routeBackends — now used consistently.)

Verified already-conformant:

• Ginkgo/Gomega (.agents/coding-style.md): all new tests use Describe/It + Expect(...).To(...); no t.Run/t.Errorf (forbidigo-clean).
• Outbound HTTP (.agents/coding-style.md): all calls go through the existing c.do(...) → pkg/httpclient; no raw http.Client/http.Get/http.DefaultClient.
• any not interface{}; tabs for Go; no new files (no SPDX needed).
• Docs-with-code rule: no user-facing change — the two tools now work as their existing descriptions already state; docs/content/features/localai-assistant.md tool catalog unchanged and still accurate.
• Tool↔REST drift map (coverage_test.go) updated to the new routes; parity_test.go fake updated.

Re-verified after the changes: go build ./pkg/mcp/localaitools/... clean; go test ./pkg/mcp/localaitools/... → localaitools, httpapi, inproc all ok.

Final diff: 5 files, +142/−45, all in pkg/mcp/localaitools/.

[localai-org-maint-bot]

@mudler Code-review sign-off at 9d4b99da6, subject to CI and human DCO certification of the fix commit. The remote MCP client now uses the live routes and their response shapes. I pushed a small follow-up to format the route map and document remote model filtering and system information. No remaining blocking source findings. Reviewed against master 48f358dd9; formatting and whitespace checks pass. The focused HTTP client tests could not start because the dependency proxy returned HTTP Forbidden for LocalAGI. The fix carries Assisted-by attribution; its human Signed-off-by remains for the contributor.