Loading skill
Install any skill in seconds. Free to start, no credit card required.
Get Started Free →nimbalyst/extension-development
Build, install, and hot-reload Nimbalyst extensions using MCP tools.
Passed 14 of 18 test cases with the skill, and 2 of 18 without it.
and 19 more in the full report
14 fixed3 passed either way5 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
A newer attempt on gemini-3.6-flash on 10/11/2026 did not produce a publishable comparison (not comparable). The snapshot above is the previously measured run.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to inspect Nimbalyst main process logs specifically filtered to extension subsystem messages. Which tool and component filter value should be used?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies mcp__nimbalyst-extension-dev__get_main_process_logs. | Missed | Passed |
| Specifies setting the component filter to EXTENSION. | Passed | Passed |
The instructions your model reads when the skill loads.
Nimbalyst provides MCP tools for building, installing, and hot-reloading extensions directly from within the running app. This enables rapid iteration on extension development without manually running build commands.
The recommended in-app scaffold flow uses File > New Extension Project, Developer > New Extension Project, or the Extension Developer Kit's /new-extension command. Enable Extension Dev Tools in Settings > Advanced before using the build/install workflow.
mcp__nimbalyst-extension-dev__extension_build
Runs the project's build script (usually vite build) with pnpm if the project uses pnpm, npm otherwise.
Parameters:
path: Absolute path to the extension project root (directory containing package.json and manifest.json)Returns: Build output including any errors or warnings.
mcp__nimbalyst-extension-dev__extension_install
Installs a built extension into the running Nimbalyst instance. The extension must be built first.
Parameters:
path: Absolute path to the extension project rootReturns: Installation status and any validation warnings.
mcp__nimbalyst-extension-dev__extension_reload
Rebuilds and reinstalls an extension in one step. This is the most common tool for iterating on extension development.
Parameters:
extensionId: The extension ID from manifest.json (e.g., "com.nimbalyst.my-extension")path: Absolute path to the extension project roottest cases passed, vs 2 / 18 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.