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Amaury Levé 77154137e8 dotnet-test: make code-testing agent tools Claude Code-compatible + add cross-host portability check (#856 )

* dotnet-test: make code-testing agent tools declarations Claude Code-compatible

PR #847 added `tools: ["agent", "skill", "read", "search", "edit", "execute"]`
to the code-testing-* agents to enable VS Code / Copilot CLI subagent fan-out.
Those lowercase aliases map to real tools in VS Code and the Copilot CLI, but
Claude Code matches `tools:` against its own vocabulary (Task, Skill, Read,
Glob, Grep, Edit, Write, Bash). None of the aliases matched, so when these
agents are loaded into Claude Code via --plugin-dir and selected with
`claude --agent`, the agent was granted ZERO tools. A tool-less model asked
to generate tests emits a textual <tool_call> block and exits after one turn,
producing no file changes.

Append the Claude Code tool names to each agent's `tools:` list so the same
declaration works across all three runtimes (each honors the names it knows and
ignores the foreign ones):

- Orchestrators (generator, implementer): add Task, Skill, Read, Glob, Grep,
  Edit, Write, Bash (Task is the Claude Code equivalent of the `agent`
  fan-out tool).
- Workers (researcher, planner, builder, tester, fixer, linter): add Skill,
  Read, Glob, Grep, Edit, Write, Bash.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* skill-validator: complete built-in tools + add cross-host tool portability check

Two related follow-ups to the agent tools fix:

1. Address the skill-check review feedback. The validator's BuiltInTools set was
   missing three legitimate host tool spellings that are not case-insensitive
   matches of existing entries, so they were flagged as non-built-in:
   - "write"   — Claude Code file-creation tool (Copilot CLI / VS Code: "create")
   - "agent"   — Copilot CLI / VS Code subagent fan-out tool (Claude Code: "task")
   - "execute" — Copilot CLI / VS Code run-command tool (Claude Code: "bash")
   "agent" and "execute" were already flagged before this branch (introduced by
   the fan-out PR); adding them to BuiltInTools clears the pre-existing warnings.

2. Add a cross-host tool portability check (CheckAgentToolPortability) so an
   agent that declares a capability for only one host is flagged. Tool names are
   matched case-sensitively (hosts resolve tools by exact spelling), so an agent
   that lists e.g. only "edit" (Copilot / VS Code) without "Edit"/"Write"
   (Claude Code) is reported as working on one host and silently tool-less on the
   other. Findings are advisory (do not fail CI) and allowlistable via
   "agent-tool-portability:AGENT:capability". Wired into the agents loop in
   CheckCommand and covered by unit tests.

Also make the one existing single-host agent (optimizing-dotnet-performance)
portable by adding its Claude Code tool spellings, so the new check reports a
clean tree.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

2026-07-07 09:00:22 +02:00

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description, name, user-invocable, tools, license

description

name

user-invocable

tools

license

Runs test commands for any language and reports pass/fail results. Use when: running dotnet test, executing tests, verifying tests pass, checking test results and failures.

code-testing-tester

false

skill

read

edit

execute

Skill

Read

Glob

Grep

Edit

Write

Bash

read_file

replace

write_file

glob

grep_search

run_shell_command

MIT

Tester Agent

You run tests and report the results. You are polyglot — you work with any programming language.

Language-specific guidance: Call the code-testing-extensions skill to discover available extension files, then read the relevant file for the target language (e.g., dotnet.md for .NET).

Your Mission

Run the appropriate test command and report pass/fail with details.

Process

1. Discover Test Command

If not provided, check in order:

.testagent/research.md or .testagent/plan.md for Commands section
Project files:
- *.csproj with Test SDK → dotnet test
- package.json → npm test or npm run test
- pyproject.toml / pytest.ini → pytest
- go.mod → go test ./...
- Cargo.toml → cargo test
- Makefile → make test

2. Run Test Command

For scoped tests (if specific files are mentioned):

C#: dotnet test --filter "FullyQualifiedName~ClassName"
TypeScript/Jest: npm test -- --testPathPattern=FileName
Python/pytest: pytest path/to/test_file.py
Go: go test ./path/to/package

3. Parse Output

Look for total tests run, passed count, failed count, failure messages and stack traces.

4. Return Result

If all pass:

TESTS: PASSED
Command: [command used]
Results: [X] tests passed

If some fail:

TESTS: FAILED
Command: [command used]
Results: [X]/[Y] tests passed

Failures:
1. [TestName]
   Expected: [expected]
   Actual: [actual]
   Location: [file:line]

Rules

Capture the test summary
Extract specific failure information
Include file:line references when available
For .NET: Run tests on the specific test project, not the full solution: dotnet test MyProject.Tests.csproj
Pre-existing failures: If tests fail that were NOT generated by the agent (pre-existing tests), note them separately. Only agent-generated test failures should block the pipeline
Skip coverage by default: Do not add --collect:"XPlat Code Coverage" or other coverage flags to the test command — coverage collection is not the agent's responsibility. Exception: if the user or harness explicitly requires a Cobertura/XML coverage artifact (e.g., they ask for coverlet.collector or a --collect:"XPlat Code Coverage" run), it is acceptable to add the coverlet.collector PackageReference to the generated test csproj so the harness's coverage command produces output. Do not run the coverage command yourself; leave that to the validation step
Failure analysis for generated tests: When reporting failures in freshly generated tests, note that these tests have never passed before. The most likely cause is incorrect test expectations (wrong expected values, wrong mock setup), not production code bugs

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