mega-01 × google/gemma-4-e4b (GGUF)

Model: google/gemma-4-e4b (GGUF, auto-loaded context: 131072) Chat: "Unnamed Chat" (LM Studio, vibeLM plugin, real tools attached)

Pre-run anomalies

• Reset ~/Desktop/sandbox/weather-cli (and stray root-level files from the previous MLX run) and cleared runtime-state.json before starting.

Turn 1 — new plugin bug discovered (Bug 3)

Prompt: "yo can you set me up a quick node cli in ~/Desktop/sandbox/weather-cli that just takes a city and prints the current weather, pull from some free api"

Real tool-use sequence, all via genuine plan tooling this time (create_plan/update_plan_step): create_plan, bash_terminal (mkdir -p ~/Desktop/sandbox/weather-cli — succeeded), web_search × 2 (both returned irrelevant results — unrelated "Free" ISP and "BEST" patio-tile company pages, not weather APIs), update_plan_step (noted search failed, falling back to OpenWeatherMap with a placeholder key), write_file, update_plan_step, amend.

The write_file call passed path: "~/Desktop/sandbox/weather-cli/index.js" — a literal string starting with ~, not a shell-expanded path. The plugin's write_file tool reported success ("action":"written"), but the actual path written was:

i.e. a literal directory named ~ was created inside the workspace, and the redundant Desktop/sandbox/weather-cli segments were nested inside that. The intended target, ~/Desktop/sandbox/weather-cli/index.js, was never written — find ~/Desktop/sandbox/weather-cli shows the directory exists (from the earlier bash_terminal mkdir) but is empty. The plan's own step 2 ("Write the Node.js code in index.js...") was marked "status": "done" based on this false-success report, and amend closed out the turn despite steps 0 and 3 still reading "pending" in the final runtime-state.json.

Root cause (confirmed via source read, src/toolsProvider.ts:540-547): all file tools (write_file, read_file, append_file, rename_file, search_files, delete_file) share one helper, sandboxPath(workspace, requestedPath), which does nothing but path.resolve(workspace, requestedPath) plus a workspace-containment check. Node's path.resolve never expands ~ (that's a shell-only convention) — it treats ~/Desktop/sandbox/weather-cli/index.js as an ordinary relative path segment and joins it verbatim onto the workspace root. The containment check still passes (the garbled path is still nested under the workspace), so no error is raised. bash_terminal is unaffected — it hands the raw command string to a real shell, which expands ~ natively.

This is not this model's mistake alone: a leftover package.json was found at the exact same garbled path (.../sandbox/~/Desktop/sandbox/weather-cli/package.json), dated from an earlier model's session (qwen3.6-27b, ts ~13:18) that ran bash_terminal chmod +x ~/Desktop/sandbox/weather-cli/index.js — confirming this same tilde-path confusion has silently corrupted file locations across multiple models in this benchmark whenever a model uses a ~-prefixed path with a file tool instead of a workspace-relative one.

Suggested minimal fix: in sandboxPath, reject or expand (via os.homedir()) any requestedPath whose first path segment is literally ~, before passing it to resolve(), instead of silently treating it as a relative directory name.

T1: FAIL — no working code at the intended path; real plugin bug (not fixed yet — flagging for a follow-up branch, consistent with Bug 1/Bug 2 handling earlier in this benchmark run). Also would have needed a manual OpenWeatherMap key even if the path had resolved correctly.

Scenario verdict: FAIL (stopped after T1)

Distinct from prior failures: this is the first case in the benchmark where the breakdown is squarely a plugin bug, not primarily a model behavior problem — the model's plan, search, and tool-call sequencing were all reasonable; the write_file path handling silently ate the result.