Load executor skills without host path conversion - #29626
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## Why
Plugin manifests use the same schema whether the package lives on the
host or in an executor. Only the path representation differs: host
callers need native `Path` inputs and `AbsolutePathBuf` outputs, while
executor callers need `PathUri` throughout.
Maintaining separate parsing or resolver implementations would duplicate
the manifest rules and allow them to drift. This PR instead makes
URI-native resolution the single parsing path and keeps host conversion
at the boundary.
## What changed
- Make `parse_plugin_manifest_uri` the shared manifest parser and
resolve every path-bearing field as `PathUri`.
- Keep the existing host entrypoint as a thin adapter: convert its
native root and manifest path to `PathUri`, run the shared parser, then
map resources back to `AbsolutePathBuf`.
- Expose `PluginManifest::try_map_resources` so callers can convert the
generic resource type without duplicating manifest construction.
- Resolve relative manifest paths using the root URI's convention:
backslashes are separators for Windows roots and ordinary filename
characters for POSIX roots.
- Apply lexical containment after URI resolution, rejecting absolute
paths and parent traversal outside the plugin root.
- Make encoded backslashes fail containment only for Windows URIs;
encoded `/` remains unsafe for every convention.
- Use a host-native synthetic root for marketplace fallback manifests so
the host adapter also works on Windows.
```text
host Path --------> PathUri --\
+--> one manifest parser --> PluginManifest<PathUri>
executor PathUri -------------/
host result: PluginManifest<PathUri> --> PluginManifest<AbsolutePathBuf>
```
Existing host manifest behavior is preserved; #28918 is the first
executor consumer.
## Verification
- `just test -p codex-utils-path-uri`
- `just test -p codex-plugin`
- `just test -p codex-core-plugins`
## Stack
1. #29614 — add lexical `PathUri` containment.
2. **This PR** — share URI-native manifest path resolution.
3. #28918 — keep selected plugin roots and resources URI-native.
4. #29626 — load executor skills without host path conversion.
5. #29628 — resolve executor MCP working directories without host path
conversion.
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## Why Selected capability roots belong to the executor filesystem, not the app-server host. Converting their path strings into the host's native `Path` breaks whenever the two machines use different path conventions, such as a Windows executor behind a Unix app-server. This PR establishes `PathUri` as the selected-plugin boundary so the executor remains authoritative for its paths. ## What changed - Require `selectedCapabilityRoots[].location.path` to be a canonical `file:` URI and deserialize it directly as `PathUri`; native path strings are rejected. - Update the app-server schema, generated TypeScript, examples, and request coverage for the URI contract. - Keep selected roots, resolved plugin locations, manifest paths, and manifest resources as `PathUri`. - Inspect and read plugin roots and manifests only through the selected environment's `ExecutorFileSystem`. - Parse executor manifests with the shared URI-native parser from #29620 instead of projecting them onto the host filesystem. - Enforce resource containment lexically and preserve the root URI's POSIX or Windows path convention. - Cover foreign Windows plugin roots and URI-native manifest resources. ```text thread/start selectedCapabilityRoots[].location.path = "file:///C:/plugins/demo" | PathUri v ExecutorFileSystem | +--> plugin.json +--> manifest resources ``` This PR stops at the shared selected-plugin representation. The next two PRs remove the remaining host-path projections in the skill and MCP consumers. ## Stack 1. #29614 — add lexical `PathUri` containment. 2. #29620 — share URI-native manifest path resolution. 3. **This PR** — keep selected plugin roots and resources URI-native. 4. #29626 — load executor skills without host path conversion. 5. #29628 — resolve executor MCP working directories without host path conversion.
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Why
After #28918, selected skill roots are
PathUri, but the executor skill provider still converts them to the app-server host'sAbsolutePathBuf. A foreign Windows root therefore cannot be discovered by a Unix host, and the inverse has the same problem.This PR keeps executor skill discovery and reads on the filesystem that owns the selected root while reusing the existing skill rules.
What changed
PathUrithroughExecutorFileSystem, preserving its depth, directory, symlink, and sibling-metadata concurrency behavior.PathUriin the skill catalog, then routeskills.readback through the same environment filesystem.No second filesystem abstraction or duplicate traversal implementation is introduced.
Stack
PathUricontainment.