deephaven

Add a new command to the dhcli CLI — invoke when adding or editing a verb under cli/_commands/. Wraps the click + Pattern B + structured-error + agents-manifest conventions; prevents the most common bugs (calling asyncio.run inline, printing errors to stderr,…

The content contract for dhcli CLI help — required sections, HelpSpec authoring, plain-text rendering rules, single-source output schema, and docs/CLI.md consistency — invoke when authoring or reviewing any command help, option help, or the agents manifest

Conventions for dhcli commands that wrap an MCP tool — wrapper categories, type scoping, path-flag locality (CLI-read vs server-side), and the wraps_tool drift contract — invoke when adding/editing a cli/_commands verb that fronts a tool; not for authoring…

The role — audience and scope — of every top-level markdown document in this project. Invoke before editing any top-level doc, and when deciding where new documentation content belongs, to keep edits in-scope and prevent content drift between documents

Reference guide for this project — architecture, server commands and ports, config layout, code quality check commands, test clients — invoke when working with server configuration, running checks, or navigating the codebase

Python coding conventions and style guide for this project — invoke before writing or reviewing any Python under src/ or tests/, including docstring-only edits. Numbered rules covering private-access boundaries, test-file naming and placement, type-hint…

Comprehensively improve unit tests — invoke when a source file's coverage is below the 100%-per-file target, or its test file is missing or disorganized. Ensures test files exist, adds missing tests, removes unneeded ones, and restructures to reach full…

Run the dependency freshness check — invoke before a release, or after changing dependencies in pyproject.toml. Performs a fresh resolve then runs mypy and pytest against it, and diagnoses any failures

Write documentation. Use when asked to write documentation, update docs, or build plugin docs.

Build and install Python plugins using plugin_builder.py. Use when asked to build, install, or reinstall a plugin.

Run Playwright end-to-end tests in Docker. Use when asked to run e2e tests, integration tests, Playwright tests, or browser tests.

Run JavaScript/TypeScript Jest unit tests. Use when asked to run JS tests, Jest tests, or frontend unit tests.

Run Python plugin tests using tox. Use when asked to run Python tests, unit tests for a plugin, or tox commands.

Manages Deephaven server connections and code execution through VS Code MCP tools. Handles connecting to DHC/DHE servers, executing Python/Groovy code via runCode/runCodeFromUri, opening variable panels, troubleshooting connection issues, and retrieving…

Write MCP tools for the vscode-deephaven TypeScript MCP server. Use when adding new tools, implementing tool handlers, or creating tests for MCP tools.

Writes unit tests for vscode-deephaven using Vitest and TypeScript. Use when writing tests, adding unit tests for new features, or verifying service/component behavior. Covers test structure, mocking patterns, parameterized tests, and…

Queries Deephaven documentation for API help, syntax guidance, and best practices. Provides answers about table operations, filtering, joining, aggregations, plotting, and other Deephaven features in Python or Groovy. Use when learning Deephaven APIs, writing…

Research the Community Core codebase to understand implementations, architecture, and feature behavior

Work with Deephaven for real-time data processing. Use for table queries, joins, aggregations, time-series, UI dashboards, plotting (dx), Kafka streaming, Iceberg integration. Triggers on mentions of Deephaven, tables or queries, and related concepts.