Add structured rtk dotnet support (build/test/restore) with binlog/TRX parsing, robust argument forwarding, and locale-stable fallback behavior by danielmarbach · Pull Request #172 · rtk-ai/rtk

danielmarbach · 2026-02-17T13:16:20Z

Add first-class .NET support to RTK: rtk dotnet build, rtk dotnet test, rtk dotnet restore (+ passthrough for other subcommands).
Implement structured parsing with new modules:
- src/binlog.rs for MSBuild binlog parsing
- src/dotnet_trx.rs for TRX parsing + failed test extraction
- src/dotnet_cmd.rs for orchestration, formatting, forwarding, and fallback logic
Make structured artifacts authoritative (binlog/TRX first, text parsing only as fallback).
Improve robustness by setting DOTNET_CLI_UI_LANGUAGE=en-US for spawned dotnet invocations (stable fallback parsing across locales).
Integrate command routing/docs/fixtures (src/main.rs, README.md, tests/fixtures/dotnet/*, Cargo.toml/Cargo.lock).

Why

Raw dotnet output is verbose and token-expensive in LLM workflows.
.NET/MSBuild output can be localized; text-only parsing is brittle.
Structured-first parsing gives more reliable summaries while preserving exit codes and user args.
Benefits
Significant token reduction on real .NET workflows.
Cleaner, focused build/test/restore summaries.
Better cross-locale reliability without sacrificing fallback resilience.
Safer argument handling and improved test diagnostics extraction.

Real-world impact (NServiceBus)

Solution-level run against NServiceBus.slnx:

rtk dotnet test ...: 86.4% savings (~3.1K tokens)
rtk dotnet build ...: ~93% savings (~523 tokens)
rtk dotnet restore ...: ~0% (already minimal output)

More outputs

02-17 13:23 ▲ rtk dotnet test           -82% (186)
02-17 13:23 ▲ rtk dotnet build          -80% (163)
02-17 13:17 ▲ rtk dotnet build          -91% (863)
02-17 13:17 ▲ rtk dotnet restore        -97% (1.2K)
02-17 13:10 ▲ rtk dotnet test NServi... -86% (3.1K)
02-17 13:00 ▲ rtk dotnet build NServ... -93% (523)
02-17 13:00 • rtk dotnet restore NSe... -0% (0)
02-17 12:54 ■ rtk dotnet test --no-b... -38% (303)
02-17 12:54 ▲ rtk dotnet build --no-... -76% (130)
02-17 12:54 • rtk dotnet restore        -0% (0)

danielmarbach · 2026-02-17T13:26:28Z

@DavidFowler this might be something of interest to you

It probably still misses a few things but might be a good start

F0rty-Tw0 · 2026-02-17T18:25:39Z

Will be testing this during the week. Thanks for enormous work.

F0rty-Tw0

Overall very good job :)

F0rty-Tw0 · 2026-02-17T18:56:23Z

src/dotnet_trx.rs

+    find_recent_trx_in_dir(Path::new("./TestResults"))
+}
+
+fn find_recent_trx_in_dir(dir: &Path) -> Option<PathBuf> {


a failing dotnet test can produce a ./TestResults/<GUID>/test.trx and it looks like we don't check for that in here.

F0rty-Tw0 · 2026-02-17T19:01:18Z

src/dotnet_trx.rs

+
+lazy_static! {
+    // Note: (?s) enables DOTALL mode so . matches newlines
+    static ref TRX_COUNTERS_RE: Regex = Regex::new(


here and in line 12 regex takes in consideration the attribute order, but the xml report attribute order is not guaranteed, parser can silently miss counters/failed tests and under-report failures

F0rty-Tw0 · 2026-02-17T19:03:33Z

src/dotnet_cmd.rs

+        .any(|arg| matches!(arg.to_ascii_lowercase().as_str(), "-nologo" | "/nologo"))
+}
+
+fn has_logger_arg(args: &[String]) -> bool {


interesting one, and i think it can wrongly return true when an argument like --results-directory logs/logger-output is passed, or a test filter containing logger.

pszymkowiak · 2026-02-18T22:31:45Z

This is an outstanding PR — probably the most thorough community contribution we've received. The binary binlog parser, multi-layer fallback strategy (binlog → text → TRX), and 42 tests
show serious engineering. Really impressive work, thank you!

A few things to address before merge:

Missing hook rewrite (required)

Without this, Claude Code will type dotnet build and it won't go through the RTK filter. Every command we support has a corresponding rewrite in .claude/hooks/rtk-rewrite.sh. Please add:

--- .NET ---

elif echo "$MATCH_CMD" | grep -qE '^dotnet[[:space:]]+(build|test|restore)([[:space:]]|$)'; then
REWRITTEN="${ENV_PREFIX}$(echo "$CMD_BODY" | sed 's/^dotnet/rtk dotnet/')"

See the cargo/pytest/ruff sections in the hook file for examples.

Binlog parse crash on build (bug)

In dotnet_cmd.rs, run_dotnet_with_binlog() for "build" does:
binlog::parse_build(&binlog_path)?
If the binlog is corrupted, this crashes instead of falling back to text. The "test" path already handles this correctly with .unwrap_or_default(). Please use the same pattern for build
and restore.

Regex compiled at runtime in scrub_sensitive_env_vars()

This function calls Regex::new() in a loop for every env var on every invocation. Should be lazy_static! to avoid recompilation. Not a blocker but matters for performance.

Binlog temp files not cleaned up

build_binlog_path() creates files in /tmp/rtk_dotnet_* but never removes them. Could accumulate over time. Consider cleaning up after parsing, similar to how you handle TRX cleanup.

None of these are major — #1 is the only blocker. Great work!

danielmarbach · 2026-02-19T05:18:06Z

Thank you for the kinds words

It will take a while until I can address those because I have a few prio things I need to get through first but I should be able to get back to this next week

danielmarbach added 10 commits February 17, 2026 10:34

Basic dotnet implementation

ff10599

Better default behavior

be6111f

Isolate trx handling

70bd78c

Fixtures

31e8b3a

Actual proper binlog parsing

92be082

Fix summary and failure detection

c39120f

Restore fix

0136a85

Fix test

9dce881

Prefer binlog

24ef195

Set the CLI language

18e4177

danielmarbach mentioned this pull request Feb 17, 2026

feat: Add support for dotnet CLI commands #103

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Add structured rtk dotnet support (build/test/restore) with binlog/TRX parsing, robust argument forwarding, and locale-stable fallback behavior#172

Add structured rtk dotnet support (build/test/restore) with binlog/TRX parsing, robust argument forwarding, and locale-stable fallback behavior#172
danielmarbach wants to merge 11 commits intortk-ai:masterfrom
danielmarbach:feat-dotnet

danielmarbach commented Feb 17, 2026 •

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Real-world impact (NServiceBus)

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pszymkowiak commented Feb 18, 2026

--- .NET ---

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danielmarbach commented Feb 17, 2026 •

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