fix: hardening from the 2026-09-02 beta audit (compile-check on Windows, uv.lock drift, CI stdio pin, auth surface) - #1376
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A core.autocrlf checkout gives tools/compile-defines.txt and tools/compile-refs/*.txt CRLF endings; the read loops kept the CR, so every -define: carried a stray \r and every LIBCACHE/ reference failed to resolve, failing the Editor build on TestRunner types. Strip the CR when reading and pin those manifests to LF in .gitattributes. Also normalise REPO/UNITY_DATA/OUT through pwd -W so Git Bash's /x/... paths do not reach Roslyn as X:\x/..., and document the Windows recipe in the header.
The lock's own-project entry still said 10.1.0 while pyproject.toml said 10.2.0, so uv sync --locked failed and CI silently re-resolved. update_versions.py now rewrites the mcpforunityserver entry, release.yml stages the lock in the bump commit, and python-tests.yml runs uv sync --locked --extra dev so pytest uses the pinned dev dependencies instead of whatever uv pip install fetches on the day.
…orPrefs McpCiBoot wrote UseHttpTransport=false to the developer's EditorPrefs and still lost to the value EditorConfigurationCache had already read: on a machine whose prefs choose HTTP with auto-start, UNITY_MCP_ALLOW_BATCH let HttpAutoStartHandler run and BridgeControlService.StartAsync stopped the stdio bridge the harness was talking to. Keep the override in SessionState so it survives domain reloads, dies with the editor process, and never touches the user's real preference.
Discovery is parameterised by platform so it can be tested for every OS from any OS, but it used pathlib.Path, which picks the host separator; four tests failed on Windows with \home\dev\Unity. Use PurePosixPath/PureWindowsPath by target.
…face - /register-tools is no longer registered in remote-hosted mode. It carried no API-key check, so any caller could replace tool definitions for every tenant; the plugin registers tools over the hub WebSocket and never calls this route. - debug_request_context redacts the values of secret-bearing argv flags. It handed --api-key-service-token to every authenticated tenant. - ApiKeyService caps its cache at 1024 entries (expired first, negatives never evict a validated key) so unauthenticated key guesses cannot grow memory, and logs a sha256 fingerprint instead of eight literal characters of the key.
set -x printed the expanded -password/-serial arguments into the job log and left GitHub's secret masking as the only protection.
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Team Run ID: 📒 Files selected for processing (6)
🚧 Files skipped from review as they are similar to previous changes (2)
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe pull request adds Unity session-scoped stdio control, server-side secret and route protections, cross-platform compile and editor discovery fixes, and automatic ChangesSecurity hardening
Unity session transport
Cross-platform and release tooling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The changes are localized hardening fixes with documented test coverage and no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant CI
participant McpCiBoot
participant EditorConfigurationCache
participant SessionState
CI->>McpCiBoot: Start CI stdio mode
McpCiBoot->>EditorConfigurationCache: PinStdioForSession()
EditorConfigurationCache->>SessionState: Store force-stdio flag
EditorConfigurationCache-->>CI: UseHttpTransport is false
EditorConfigurationCache->>SessionState: Restore flag during Refresh()
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description clearly explains all six fixes, their reasons, compatibility details, and verification results. It does not reproduce every template heading, such as Documentation Updates, Related Issues, and Additional Notes, but the required change and testing information is substantially complete. Full details: Title checkExplanation The title clearly identifies the beta-audit hardening work and names the main areas changed, including Windows compile checks, uv.lock synchronization, CI stdio handling, and authentication-surface fixes. Full details: Docstring CoverageExplanation Docstring coverage is 40.32% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 62 functions across 14 files. (1 skipped: 1 unsupported.)
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🟡 Changes recommended
Two security-relevant edge cases remain in auth/logging hardening (API key cache eviction not prioritizing negatives as intended, and argv redaction can still leak dash-prefixed secret values).
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Pull request overview
This PR applies a set of audit-driven hardening fixes across the Unity-side harness/CI utilities and the Python server’s remote-hosted auth surface, aiming to improve Windows compatibility, prevent lockfile drift, avoid leaking secrets in CI/diagnostics, and make CI stdio transport deterministic without mutating developer preferences.
Changes:
- Make the license-free Roslyn compile gate and local harness path discovery behave correctly on Windows checkouts/platform targets.
- Keep
Server/uv.lockin sync withpyproject.tomland enforce locked dependency installs in CI. - Harden remote-hosted server surfaces (disable unauthenticated tool-registration route in hosted mode, redact argv secrets, bound/safer API key cache + safer log fingerprinting), and prevent CI logs from echoing Unity credentials.
File summaries
| File | Description |
|---|---|
| tools/update_versions.py | Adds uv.lock self-version rewrite during version bumps to prevent lock drift. |
| tools/tests/test_update_versions.py | New unit tests covering uv.lock rewriting behavior and drift guardrails. |
| tools/tests/test_local_harness.py | Updates expected editor path strings to be platform-separator-correct. |
| tools/local_harness.py | Builds candidate editor paths using target-platform path flavors for cross-OS testability. |
| tools/compile-check.sh | Hardens Windows Git Bash usage (path normalization; strip CR from manifests/defines). |
| TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/EditorConfigurationCacheTests.cs | Adds EditMode tests for session-scoped stdio pin/unpin behavior. |
| Server/uv.lock | Bumps project entry version to match pyproject.toml. |
| Server/tests/test_custom_tool_service_user_scope.py | Ensures /register-tools is not exposed in remote-hosted mode. |
| Server/tests/integration/test_debug_request_context_diagnostics.py | Adds redaction tests for diagnostic argv output. |
| Server/tests/integration/test_api_key_service.py | Adds tests for bounded cache behavior and log redaction/fingerprinting. |
| Server/src/services/tools/debug_request_context.py | Redacts secret-bearing argv values in diagnostics. |
| Server/src/services/custom_tool_service.py | Disables unauthenticated REST tool registration route in remote-hosted mode. |
| Server/src/services/api_key_service.py | Adds cache cap and replaces partial-key logging with sha256 fingerprinting. |
| MCPForUnity/Editor/Services/EditorConfigurationCache.cs | Implements SessionState-based stdio pinning that overrides persisted preference. |
| MCPForUnity/Editor/McpCiBoot.cs | Pins stdio for CI sessions without writing EditorPrefs. |
| CLAUDE.md | Documents local Roslyn compile-check usage. |
| .github/workflows/release.yml | Stages Server/uv.lock during release bump commits. |
| .github/workflows/python-tests.yml | Switches CI install to uv sync --locked --extra dev to enforce lock correctness. |
| .github/workflows/e2e-bridge.yml | Prevents set -x from echoing Unity activation credentials into logs. |
| .gitattributes | Forces LF for compile-check input manifests to avoid CR contamination on Windows. |
Review details
- Files reviewed: 19/20 changed files
- Comments generated: 2
- Review effort level: Lite
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| if hide_next: | ||
| hide_next = False | ||
| if not arg.startswith("-"): | ||
| out.append("***") | ||
| continue |
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| now = time.time() | ||
| if len(self._cache) >= self.MAX_CACHE_ENTRIES: | ||
| for stale in [k for k, v in self._cache.items() if v[3] <= now]: | ||
| del self._cache[stale] | ||
| if len(self._cache) >= self.MAX_CACHE_ENTRIES: | ||
| if not result.valid: | ||
| # Full of live entries: a negative verdict is not worth evicting | ||
| # a validated key for. The caller still gets the answer. | ||
| return result | ||
| del self._cache[min(self._cache, key=lambda k: self._cache[k][3])] |
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Actionable comments posted: 2
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Inline comments:
In `@CLAUDE.md`:
- Line 171: Update the compile-check documentation around the
UNITY_DATA/UNITY_VERSION invocation to document that .compile-refs must be
populated with Newtonsoft.Json.dll and nunit.framework.dll before running it,
either by fetching or copying those files, or by setting EXTRA_REFS to a
directory containing both assemblies.
In `@tools/compile-check.sh`:
- Around line 46-47: Normalize EXTRA_REFS with winpath before it is consumed by
resolve_ref or used to generate Roslyn compiler references, while preserving the
existing behavior for unset values.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Team
Run ID: 18d2d586-ce44-4c89-a7e8-3784c0dda1f8
⛔ Files ignored due to path filters (1)
Server/uv.lockis excluded by!**/*.lock
📒 Files selected for processing (19)
.gitattributes.github/workflows/e2e-bridge.yml.github/workflows/python-tests.yml.github/workflows/release.ymlCLAUDE.mdMCPForUnity/Editor/McpCiBoot.csMCPForUnity/Editor/Services/EditorConfigurationCache.csServer/src/services/api_key_service.pyServer/src/services/custom_tool_service.pyServer/src/services/tools/debug_request_context.pyServer/tests/integration/test_api_key_service.pyServer/tests/integration/test_debug_request_context_diagnostics.pyServer/tests/test_custom_tool_service_user_scope.pyTestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/EditorConfigurationCacheTests.cstools/compile-check.shtools/local_harness.pytools/tests/test_local_harness.pytools/tests/test_update_versions.pytools/update_versions.py
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.
- _redact_argv now always hides the token after a bare secret flag; every secret flag the server accepts takes a value, so a value starting with '-' is still the secret (Copilot). - ApiKeyService evicts a negative entry before any validated key when a new validated key needs room, matching the comment's intent (Copilot). - compile-check.sh normalises EXTRA_REFS through winpath so an MSYS-style /c/refs reaches Roslyn as C:/refs (CodeRabbit). - CLAUDE.md documents the EXTRA_REFS prerequisite (CodeRabbit).
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Addressed the four bot findings in the follow-up commit: argv redaction now hides a secret value even when it starts with a dash; cache eviction drops a negative entry before any validated key; |
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Description
Six small, independent fixes from a beta audit (base
b2fd964d). None of them touch a file that any open PR touches, and each has tests.ci: make compile-check.sh work from a Windows checkout.gitattributes, Windows recipe in the headercore.autocrlfcheckout the\rrode into every-define:and everyLIBCACHE/lookup, so the Editor build failed on TestRunner/UI types. The license-free gate now runs locally in ~1 min per Unity version.chore: keep Server/uv.lock in step with the version bumpupdate_versions.pyrewrites the lock's own entry,release.ymlstages it,python-tests.ymlrunsuv sync --locked --extra dev, lock refreshed 10.1.0 → 10.2.0pyproject.toml.fix(editor): pin stdio for the CI boot session without rewriting EditorPrefsEditorConfigurationCache.PinStdioForSession()(SessionState) used byMcpCiBootUNITY_MCP_ALLOW_BATCHunlocked HTTP auto-start andBridgeControlService.StartAsyncstopped the stdio bridge mid-run. The old code also rewrote the developer's real preference. 3 EditMode tests.fix(harness): build editor paths with the target platform's separatorPurePosixPath/PureWindowsPathby target platform inlocal_harness.pyfix(server): close three audit findings on the remote-hosted auth surface/register-toolsnot registered in remote-hosted mode;debug_request_contextredacts secret argv values;ApiKeyServicebounded cache + sha256 fingerprint in logsci: stop xtrace from echoing Unity credentials during activation-xaround the Unity activation call ine2e-bridge.yml-password/-serialwere echoed into the job log with only secret masking in the way.Type of Change
Verification
tools/compile-check.shpasses for Unity 2021.3.45f2 and 6000.3.9f1 on win/osx/linux, run from this branch on a Windows checkout.-runTests, 2021.3.45f2) for the touched fixtures: 38/38, including the 3 newEditorConfigurationCachetests.tools/tests123 passed;uv sync --locked --extra devsucceeds.Compatibility / Package Source
Summary by CodeRabbit
Security
Reliability
Bug Fixes
Documentation