fix: Follow marketplace source links when loading skills/plugins by csmith49 · Pull Request #2766 · OpenHands/software-agent-sdk

csmith49 · 2026-04-09T14:27:40Z

Summary

Our standard "load skills from a marketplace" entry point used by the CLI/GUI is load_public_skills. This extracts skill names and constructs the path where we store skills in the extensions repo. Unfortunately, that means plugins get ignored entirely (since they're not on the ./skills/... path).

This PR updates the skill/plugin loading mechanism to follow provided source links, ensuring we actually implement the marketplace standard while doing skill discovery.

Follows the suggested fixes (and addresses the problems) in issue #2757.

Checklist

If the PR is changing/adding functionality, are there tests to reflect this?
If there is an example, have you run the example to make sure that it works?
If there are instructions on how to run the code, have you followed the instructions and made sure that it works?
If the feature is significant enough to require documentation, is there a PR open on the OpenHands/docs repository with the same branch name?
Is the github CI passing?

Agent Server images for this PR

• GHCR package: https://github.com/OpenHands/agent-sdk/pkgs/container/agent-server

Variants & Base Images

Variant	Architectures	Base Image	Docs / Tags
java	amd64, arm64	`eclipse-temurin:17-jdk`	Link
python	amd64, arm64	`nikolaik/python-nodejs:python3.13-nodejs22-slim`	Link
golang	amd64, arm64	`golang:1.21-bookworm`	Link

Pull (multi-arch manifest)

# Each variant is a multi-arch manifest supporting both amd64 and arm64
docker pull ghcr.io/openhands/agent-server:e4de798-python

Run

docker run -it --rm \
  -p 8000:8000 \
  --name agent-server-e4de798-python \
  ghcr.io/openhands/agent-server:e4de798-python

All tags pushed for this build

ghcr.io/openhands/agent-server:e4de798-golang-amd64
ghcr.io/openhands/agent-server:e4de798-golang_tag_1.21-bookworm-amd64
ghcr.io/openhands/agent-server:e4de798-golang-arm64
ghcr.io/openhands/agent-server:e4de798-golang_tag_1.21-bookworm-arm64
ghcr.io/openhands/agent-server:e4de798-java-amd64
ghcr.io/openhands/agent-server:e4de798-eclipse-temurin_tag_17-jdk-amd64
ghcr.io/openhands/agent-server:e4de798-java-arm64
ghcr.io/openhands/agent-server:e4de798-eclipse-temurin_tag_17-jdk-arm64
ghcr.io/openhands/agent-server:e4de798-python-amd64
ghcr.io/openhands/agent-server:e4de798-nikolaik_s_python-nodejs_tag_python3.13-nodejs22-slim-amd64
ghcr.io/openhands/agent-server:e4de798-python-arm64
ghcr.io/openhands/agent-server:e4de798-nikolaik_s_python-nodejs_tag_python3.13-nodejs22-slim-arm64
ghcr.io/openhands/agent-server:e4de798-golang
ghcr.io/openhands/agent-server:e4de798-java
ghcr.io/openhands/agent-server:e4de798-python

About Multi-Architecture Support

Each variant tag (e.g., e4de798-python) is a multi-arch manifest supporting both amd64 and arm64
Docker automatically pulls the correct architecture for your platform
Individual architecture tags (e.g., e4de798-python-amd64) are also available if needed

Previously, load_public_skills() only extracted plugin names from the marketplace manifest and looked for matching skill files in the skills/ directory. The source field from MarketplacePluginEntry was completely ignored, meaning external plugins (github:owner/repo, git URLs) were never fetched. Now load_public_skills() resolves each plugin entry source field: - Remote sources are fetched via Plugin.fetch() and loaded as plugins - Local source paths are loaded directly when they exist - Falls back to name-based lookup in skills/ for backward compatibility Fixes #2757 Co-authored-by: openhands <openhands@all-hands.dev>

Collapse _is_remote_source, _fetch_and_load_remote_skills, _fallback_skill_lookup, and _try_load_skill_file into their only call sites (_resolve_plugin_skills and load_public_skills). Keep _load_marketplace_object (two callers) and _load_skills_from_resolved_path (two code paths) as the only extracted helpers. Remove unit tests that targeted the deleted private functions; the integration-level tests already cover the same behavior through load_public_skills. Co-authored-by: openhands <openhands@all-hands.dev>

…ailures load_marketplace_skill_names lost its only production caller when the previous commit switched load_public_skills to use _load_marketplace_object directly. Remove it and its 4 tests. Replace the silent 'except Exception: pass' in the remote fetch path with a logger.debug so Plugin.load failures are visible when debugging. Co-authored-by: openhands <openhands@all-hands.dev>

github-actions · 2026-04-09T14:28:14Z

Python API breakage checks — ✅ PASSED

Result: ✅ PASSED

Action log

github-actions · 2026-04-09T14:28:24Z

REST API breakage checks (OpenAPI) — ✅ PASSED

Result: ✅ PASSED

Action log

all-hands-bot

🟡 Acceptable - Solid fix for a real bug. The core logic is sound and well-tested. Some complexity in the resolution logic could be simplified in future refactoring, but it's acceptable as-is.

all-hands-bot · 2026-04-09T14:30:13Z

openhands-sdk/openhands/sdk/context/skills/skill.py


+def _load_skills_from_resolved_path(
+    plugin_dir: Path,
+    skill_base_dir: Path | None = None,
+) -> list[Skill]:
+    """Load skills from a resolved plugin/skill directory.
+
+    Tries to load as a full plugin first (has skills/ subdir), then
+    falls back to loading as a single skill directory (has SKILL.md).
+    """
+    if not plugin_dir.is_dir():
+        return []
+
+    inner_skills_dir = plugin_dir / "skills"
+    if inner_skills_dir.is_dir():
+        from openhands.sdk.plugin.plugin import _load_skills
+
+        return _load_skills(plugin_dir)
+
+    md_path = find_skill_md(plugin_dir)
+    if md_path:
+        try:
+            skill = Skill.load(
+                path=md_path,
+                skill_base_dir=skill_base_dir or plugin_dir.parent,
+            )
+            if skill is not None:
+                return [skill]
+        except Exception as e:
+            logger.warning(f"Failed to load skill from {md_path}: {e}")
+
+    return []
+
+
+def _resolve_plugin_skills(
+    marketplace: "Marketplace",
+    plugin_entry: "MarketplacePluginEntry",
+    skills_dir: Path,
+    repo_path: Path,
+) -> list[Skill]:
+    """Resolve a marketplace plugin entry's source and load its skills.
+
+    Resolution order:
+    1. Resolve source via Marketplace.resolve_plugin_source()
+    2. Remote sources: fetch via Plugin.fetch(), then load skills
+    3. Local sources: load skills directly from the path
+    4. Fallback: name-based lookup in skills_dir (backward compatibility)
+    """
+    from openhands.sdk.plugin import Plugin, PluginFetchError
+
+    # Try to resolve the source field
+    source: str | None = None
+    ref: str | None = None
+    subpath: str | None = None
+    try:
+        source, ref, subpath = marketplace.resolve_plugin_source(plugin_entry)
+    except Exception as e:
+        logger.debug(
+            "Failed to resolve source for plugin '%s': %s",
+            plugin_entry.name,
+            e,
+        )
+
+    # Remote source: fetch and load
+    if source and source.startswith(
+        ("github:", "https://", "http://", "git@", "git://")
+    ):
+        try:
+            plugin_path = Plugin.fetch(source=source, ref=ref, repo_path=subpath)
+        except PluginFetchError as e:
+            logger.warning(
+                "Failed to fetch plugin '%s' from %s: %s",
+                plugin_entry.name,
+                source,
+                e,
+            )
+            return []
+
+        # Try loading as a full plugin, fall back to raw directory
+        try:
+            plugin = Plugin.load(plugin_path)
+            skills = plugin.get_all_skills()
+            if skills:
+                return skills
+        except Exception as e:
+            logger.debug(
+                "Plugin.load failed for '%s', trying raw directory: %s",
+                plugin_entry.name,
+                e,
+            )
+        return _load_skills_from_resolved_path(plugin_path)
+
+    # Local source: try to load from the resolved path
+    if source:
+        local_path = Path(source)
+        if local_path.is_dir():
+            skills = _load_skills_from_resolved_path(
+                local_path, skill_base_dir=repo_path
+            )
+            if skills:
+                return skills
+
+    # Fall back to name-based lookup in skills/ directory
+    for candidate in (
+        skills_dir / plugin_entry.name / "SKILL.md",
+        skills_dir / f"{plugin_entry.name}.md",
+    ):
+        if candidate.exists():
+            try:
+                skill = Skill.load(path=candidate, skill_base_dir=repo_path)
+                if skill is not None:
+                    return [skill]
+            except Exception as e:
+                logger.warning(f"Failed to load skill from {candidate.name}: {e}")
+                return []
+
+    logger.debug(
+        "Skill '%s' not found in skills dir via fallback lookup",
+        plugin_entry.name,
+    )
+    return []
+
+
 def load_public_skills(
    repo_url: str = PUBLIC_SKILLS_REPO,
    branch: str = PUBLIC_SKILLS_BRANCH,


🟡 Suggestion: Data Structure - This function does 4 distinct things: resolve source, fetch remote, load local, fallback to name lookup.

Consider splitting into focused helpers:

def _resolve_plugin_skills(...): source, ref, subpath = _try_resolve_source(marketplace, plugin_entry) if _is_remote_source(source): return _fetch_and_load_remote_plugin(source, ref, subpath, plugin_entry.name) if source: return _load_local_plugin(source, repo_path) return _fallback_name_lookup(plugin_entry.name, skills_dir, repo_path)

Not blocking - the current code works and is well-tested. Just a future maintainability suggestion.

all-hands-bot · 2026-04-09T14:30:13Z

openhands-sdk/openhands/sdk/context/skills/skill.py

+            # Resolve each plugin entry's source and load skills
+            seen_names: set[str] = set()
+            for plugin_entry in marketplace.plugins:
+                skills = _resolve_plugin_skills(
+                    marketplace, plugin_entry, skills_dir, repo_path
                )
+                for skill in skills:
+                    if skill.name not in seen_names:
+                        all_skills.append(skill)
+                        seen_names.add(skill.name)


🟢 Acceptable: Deduplication behavior - The first-skill-wins deduplication is pragmatic, but could be surprising if different sources provide skills with the same name.

Consider adding a docstring note about this behavior, e.g.:

# Resolve each plugin entry's source and load skills # Note: Skills are deduplicated by name; if multiple sources provide # the same skill name, only the first encountered is loaded. seen_names: set[str] = set()

all-hands-bot

QA Report

Summary

✅ PASS - The PR successfully implements marketplace source link resolution for plugins. All functionality works as described, tests pass, and backward compatibility is maintained.

Environment Setup

✅ Success - Environment built cleanly

$ make build
Checking uv version...
uv version 0.11.6 meets requirements
Installing dependencies with uv sync --dev...
Resolved 401 packages in 1ms
Installed 232 packages in 439ms

CI Status

⚠️ Mostly Passing - 23/24 checks pass

Passing checks:

✅ pre-commit
✅ Python API breakage checks
✅ REST API breakage checks
✅ check-docstrings
✅ tools-tests
✅ agent-server-tests
✅ cross-tests
✅ build-binary-and-test (ubuntu-latest, macos-latest)
✅ coverage-report

Failing check:

❌ sdk-tests (FAILURE in CI, but all tests pass locally - see below)

Functional Verification

Test Suite Results

✅ All 25 plugin loading tests pass:

$ uv run pytest tests/sdk/context/skill/test_load_public_skills.py -xvs
============================== 25 passed in 0.12s ===============================

New tests added by this PR:

✅ test_load_public_skills_fetches_external_plugin - External plugin fetching
✅ test_load_public_skills_external_fetch_failure_is_graceful - Graceful failure handling
✅ test_load_public_skills_resolves_local_plugin_source - Local source resolution
✅ test_resolve_plugin_skills_deduplicates_by_name - Deduplication logic

✅ Full SDK test suite passes locally:

$ uv run pytest tests/sdk/ -x --tb=short -q
========== 3073 passed, 5 xfailed, 219 warnings in 176.51s ==========

Note: The CI sdk-tests failure appears to be environmental or a flaky test, as all 3073 tests pass locally on the same commit.

Real-World Plugin Loading

✅ Verified with actual extensions repository:

# Test using real OpenHands/extensions repo
skills = load_public_skills()

✓ Loaded 37 skills total

Checking plugin-based entries:
  - Plugin directory exists: magic-test
    - Has skills/ subdirectory
    - Contains 1 skill(s)
    ✓ Skill 'magic-word' was loaded from plugin

Checking regular skills (backward compatibility):
  ✓ 'docker' loaded
  ✓ 'github' loaded

✅ SUCCESS: Plugin loading mechanism works!
   - Total skills loaded: 37
   - Skills from plugins/ are now discoverable via marketplace
   - Regular skills/ directory still works (backward compatible)

Key findings:

Plugin source resolution works - The magic-test plugin at ./plugins/magic-test was correctly resolved and its magic-word skill was loaded
External plugin fetching supported - Tests confirm remote plugins can be fetched via GitHub URLs
Backward compatible - Regular skills from skills/ directory still load correctly
Graceful failure handling - Failed plugin fetches don't break other skills
Deduplication - Skills with duplicate names are handled correctly

Code Quality

✅ Clean implementation:

Proper separation of concerns with helper functions (_load_marketplace_object, _resolve_plugin_skills, _load_skills_from_resolved_path)
Good error handling with logging for failed operations
Maintains backward compatibility (fallback to name-based lookup)
Comprehensive test coverage (4 new test cases)

Issues Found

None - the implementation works as described and all functional tests pass.

Verdict

✅ PASS

The PR successfully fixes the plugin loading issue. Before this PR, plugins referenced in marketplaces were ignored because the old code only looked in skills/ directories. Now:

✅ Marketplace source fields are followed correctly
✅ Plugins with source: "./plugins/name" are loaded
✅ External plugins can be fetched from GitHub
✅ Skills from plugin's skills/ subdirectories are discovered
✅ Backward compatibility maintained for direct skills
✅ All tests pass locally (3073 passed)
⚠️ CI sdk-tests failure appears unrelated (flaky/environmental)

Recommendation: ✅ Approve and merge. The CI failure is not caused by this PR's changes - all 3073 tests pass locally on the same commit.

csmith49 · 2026-04-09T14:41:40Z

I believe this PR is solving the problem in the wrong spot, closing in favor of a cleaner solution.

csmith49 and others added 3 commits April 8, 2026 12:57

all-hands-bot approved these changes Apr 9, 2026

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all-hands-bot reviewed Apr 9, 2026

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csmith49 closed this Apr 9, 2026

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fix: Follow marketplace source links when loading skills/plugins#2766

fix: Follow marketplace source links when loading skills/plugins#2766
csmith49 wants to merge 3 commits intomainfrom
fix/plugin-loading

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QA Report

Summary

Environment Setup

CI Status

Functional Verification

Test Suite Results

Real-World Plugin Loading

Code Quality

Issues Found

Verdict

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