rudironsoni dotnet-agent-harness-hooks
Source: dotnet-artisan (MIT) — Claire Novotny LLC. Ported into dotnet-agent-harness.
This guide explains the hook patterns and MCP server integration used by the dotnet-agent-harness ecosystem.
Hooks overview
Hooks fire automatically during Claude Code sessions. They provide .NET-focused defaults and suggestions.
PostToolUse hook (Write|Edit)
A single hook entry with matcher Write|Edit dispatches to scripts/hooks/post-edit-dotnet.sh, which inspects the
edited file's extension and takes the appropriate action.
| File pattern | Behavior | Details |
|---|---|---|
*Tests.cs, *Test.cs |
Suggests running related tests | Outputs a systemMessage with a dotnet test --filter command targeting the modified test class |
*.cs |
Auto-formats with dotnet format |
Runs dotnet format --include <file> asynchronously; reports results on the next turn |
*.csproj |
Suggests dotnet restore |
Outputs a systemMessage recommending restore after project file changes |
*.xaml |
Validates XML well-formedness | Uses xmllint or falls back to python3 xml.etree.ElementTree; reports validation errors |
This hook runs asynchronously (async: true) with a 60-second timeout. It never blocks editing (always exits 0).
SessionStart hook (startup)
The scripts/hooks/session-start-context.sh hook fires once when a new Claude Code session starts. It detects whether
the current directory is a .NET project and injects context.
- Counts
.sln/.slnxsolution files (up to 3 directories deep) - Counts
.csprojproject files (up to 3 directories deep) - Checks for
global.json - Extracts the target framework moniker (TFM) from the first
.csprojfound
If .NET project indicators are found, the hook outputs an additionalContext message such as:
This is a .NET project (net10.0) with 3 project(s) in 1 solution(s).
This context helps Claude understand the project environment from the start of the session.
How to disable hooks
Plugin hooks can be disabled in two ways:
- Disable all hooks globally: set
disableAllHooks: truein your.claude/settings.jsonfile. This disables hooks from all plugins. - Per-session control: use the
/hooksmenu within Claude Code to review and toggle individual hooks during a session. Hooks snapshot at session startup; changes via/hookstake effect immediately but do not persist across restarts.
To re-enable hooks after disabling, remove the disableAllHooks setting or toggle them back on via /hooks.
MCP server configuration
The plugin configures the following MCP server in .mcp.json.
Context7
| Property | Value |
|---|---|
| Transport | stdio |
| Command | npx -y @upstash/context7-mcp@latest |
| Purpose | Library documentation lookup covering Microsoft Learn, NuGet, and .NET ecosystem docs |
Context7 provides on-demand documentation lookups that enhance skill guidance with live, up-to-date library references.
Version note: The plugin currently uses @latest for initial ship. After stabilization, the version may be pinned
(for example @1.x.x) to prevent upstream breaking changes.
Requirements
- Node.js is required for MCP servers that use
npx. Verify Node.js is installed by runningnode --versionin your terminal. You can also check MCP server status with the/mcpcommand inside Claude Code. - MCP servers start automatically when the plugin is enabled. After enabling or disabling the plugin, restart Claude Code to apply MCP server changes.
Troubleshooting
dotnet not found
The PostToolUse hook checks for dotnet in PATH before running dotnet format. If the .NET SDK is not installed or
not in PATH, the hook degrades gracefully: it outputs a warning message and exits 0 without blocking.
Fix: install the .NET SDK and ensure dotnet is available in your shell's PATH.
npx not available
MCP servers configured with npx (such as Context7) will not start if Node.js is not installed.
Fix: install Node.js (LTS recommended). After installation, restart Claude Code so MCP servers can initialize.
Hooks not firing
Hooks are snapshotted when a Claude Code session starts. If you install or update the plugin mid-session, hooks from the new version will not fire until the next session.
Fix: restart Claude Code to pick up hook changes. Use /hooks to verify hooks are registered.
jq not found
The hook scripts use jq to parse JSON input from stdin. If jq is not installed, the hook scripts will fail. The
post-edit-dotnet.sh script requires jq for extracting the file_path from tool input.
Fix: install jq via your system package manager.
- macOS:
brew install jq - Ubuntu/Debian:
sudo apt-get install jq - Windows:
winget install jqlang.jq
XAML validation unavailable
The XAML well-formedness check requires either xmllint or python3. If neither is available, the hook skips
validation and reports a warning.
Fix: install libxml2-utils (for xmllint) or ensure python3 is in your PATH.