fix: address PR review feedback
Address all reviewer comments from PR #387: 1. ✅ Add unit tests for annotations (tests/server/test_annotations.py) - 10 comprehensive test functions validating all annotation patterns - Tests for titles, read-only, destructive, idempotent operations - Validates specific ADR-017 decisions (webdav write, semantic search) - Cross-category consistency checks 2. ✅ Fix nc_webdav_write_file idempotency classification - Changed from idempotentHint=False to idempotentHint=True - Rationale: Uses HTTP PUT without version control - Writing same content to same path = same end state (idempotent) 3. ✅ Fix semantic search openWorldHint inconsistency - Changed from openWorldHint=False to openWorldHint=True - Rationale: Consistent with other Nextcloud tools - Nextcloud is external to MCP server (indexed data is implementation detail) 4. ✅ Update ADR-017 with resolved decisions - Converted Open Questions to Resolved Questions - Added detailed rationale for webdav write and semantic search - Updated status from Proposed to Implemented - Added decision timeline with dates 5. ✅ Add MCP Tool Annotations guidelines to CLAUDE.md - Comprehensive section with code examples for all patterns - Key principles documented (idempotency, destructive, open world) - References ADR-017 for detailed rationale All OAuth tools verified to have proper annotations (oauth_tools.py lines 686-751).
This commit is contained in:
Chris Coutinho
@@ -56,6 +56,68 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
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- Pass-through (default): Simple, stateless (ENABLE_TOKEN_EXCHANGE=false)
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- Token exchange (opt-in): RFC 8693 delegation (ENABLE_TOKEN_EXCHANGE=true)
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### MCP Tool Annotations (ADR-017)
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**All tools MUST include annotations** following these patterns:
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```python
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from mcp.types import ToolAnnotations
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# Read-only tools (list, search, get)
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@mcp.tool(
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title="Human Readable Name",
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annotations=ToolAnnotations(
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readOnlyHint=True,
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openWorldHint=True, # Nextcloud is external to MCP server
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),
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)
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# Create operations
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@mcp.tool(
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title="Create Resource",
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annotations=ToolAnnotations(
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idempotentHint=False, # Creates new resources each time
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openWorldHint=True,
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),
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)
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# Update operations (with etag/version control)
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@mcp.tool(
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title="Update Resource",
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annotations=ToolAnnotations(
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idempotentHint=False, # ETag changes = different inputs
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openWorldHint=True,
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),
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)
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# Delete operations
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@mcp.tool(
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title="Delete Resource",
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annotations=ToolAnnotations(
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destructiveHint=True, # Permanently deletes data
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idempotentHint=True, # Same end state if called repeatedly
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openWorldHint=True,
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),
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)
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# HTTP PUT without version control (special case)
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@mcp.tool(
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title="Write File",
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annotations=ToolAnnotations(
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idempotentHint=True, # Same content = same end state
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openWorldHint=True,
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),
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)
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```
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**Key Principles**:
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- **Idempotency**: Same inputs → same result. ETags change after updates, making them non-idempotent
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- **Destructive**: Operations that permanently delete/overwrite data
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- **Open World**: All Nextcloud tools access external service (openWorldHint=True)
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- **Titles**: Use human-readable names, not snake_case function names
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**See**: `docs/ADR-017-mcp-tool-annotations.md` for detailed rationale and examples
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### Project Structure
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- `nextcloud_mcp_server/client/` - HTTP clients for Nextcloud APIs
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- `nextcloud_mcp_server/server/` - MCP tool/resource definitions
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@@ -2,7 +2,7 @@
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## Status
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Proposed
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Implemented
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## Context
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@@ -67,10 +67,12 @@ async def tool(
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- **Deletes**: `delete_note(id=1)` → note deleted
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- Second call → 404 or success (same end state: note doesn't exist)
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- Note: May return different status code, but end state is identical
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- **Full resource PUT without version control**: Would be idempotent (we don't have these)
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- **Full resource PUT without version control**: `write_file(path="/test.txt", content="Hello")` → file has "Hello"
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- Second call → file still has "Hello" (same end state)
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- Example: `nc_webdav_write_file` uses HTTP PUT without etags/version control
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- **Set operations**: `set_property(id=1, value="X")` → property = X
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- Second call → property still = X (same result)
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- Note: Nextcloud updates use etags, so not applicable
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- Note: Nextcloud updates with etags use version control, so not idempotent
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**Read-Only** (always idempotent, never destructive):
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- All list, search, get operations
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@@ -471,11 +473,23 @@ def test_notes_tools_have_annotations():
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- Add annotation guidelines to CLAUDE.md
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- Include examples in developer documentation
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## Open Questions
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## Resolved Questions
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1. **WebDAV write_file idempotency** (Resolved: 2025-12-11)
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- **Decision**: Mark as `idempotentHint=True`
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- **Rationale**: Uses HTTP PUT without version control. Writing same content to same path repeatedly produces identical end state, which is the definition of idempotency in HTTP semantics.
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2. **Semantic search openWorldHint** (Resolved: 2025-12-11)
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- **Decision**: Mark as `openWorldHint=True`
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- **Rationale**: For consistency with other Nextcloud tools. While the data being searched is "indexed/internal", Nextcloud itself is external to the MCP server. The fact that data is indexed is an implementation detail, not a fundamental difference from other Nextcloud queries.
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1. **Icons**: Should we add visual icons for tools? (Requires design work)
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2. **Semantic search openWorldHint**: False (internal data only) or True (Nextcloud is external)?
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3. **Read-only with side effects**: Should tools that log analytics still be readOnlyHint=true?
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- **Decision**: Yes. Logging/analytics are non-visible side effects that don't change user-observable state. Read-only refers to data modifications that affect the user's content.
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## Future Considerations
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1. **Icons**: Visual icons for tools (requires design work, deferred to future ADR)
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2. **Parameter descriptions**: Add Pydantic `Field(description=...)` for better auto-completion (Phase 3, future work)
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## References
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@@ -487,6 +501,6 @@ def test_notes_tools_have_annotations():
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## Decision Timeline
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- **Proposed**: 2025-12-11
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- **Reviewed**: TBD
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- **Accepted**: TBD
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- **Implemented**: TBD
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- **Reviewed**: 2025-12-11 (Self-review during implementation)
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- **Accepted**: 2025-12-11
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- **Implemented**: 2025-12-11 (Phase 1 & 2 complete)
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@@ -39,7 +39,7 @@ def configure_semantic_tools(mcp: FastMCP):
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title="Semantic Search",
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annotations=ToolAnnotations(
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readOnlyHint=True, # Search doesn't modify data
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openWorldHint=False, # Searches only indexed Nextcloud data
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openWorldHint=True, # Queries external Nextcloud service
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),
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)
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@require_scopes("semantic:read")
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@@ -133,7 +133,7 @@ def configure_webdav_tools(mcp: FastMCP):
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@mcp.tool(
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title="Write File",
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annotations=ToolAnnotations(
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idempotentHint=False, # No etag/version control = not truly idempotent
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idempotentHint=True, # HTTP PUT without version control is idempotent
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openWorldHint=True,
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),
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)
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@@ -0,0 +1,193 @@
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"""Tests for MCP tool annotations (ADR-017)."""
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import pytest
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from mcp import ClientSession
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pytestmark = pytest.mark.integration
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async def test_all_tools_have_titles(nc_mcp_client: ClientSession):
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"""Verify all tools have human-readable titles (Phase 1 of ADR-017)."""
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tools = await nc_mcp_client.list_tools()
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# Every tool should have a title (not None)
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for tool in tools.tools:
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assert tool.title is not None, f"Tool {tool.name} is missing a title"
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# Title should not be empty
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assert tool.title.strip() != "", f"Tool {tool.name} has an empty title"
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# Title should be human-readable (not snake_case function name)
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assert tool.title != tool.name, (
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f"Tool {tool.name} title is same as function name"
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)
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async def test_all_tools_have_annotations(nc_mcp_client: ClientSession):
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"""Verify all tools have ToolAnnotations (Phase 2 of ADR-017)."""
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tools = await nc_mcp_client.list_tools()
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for tool in tools.tools:
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# Every tool should have annotations
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assert tool.annotations is not None, f"Tool {tool.name} is missing annotations"
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async def test_read_only_tools_have_correct_annotations(nc_mcp_client: ClientSession):
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"""Verify read-only tools are marked correctly."""
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tools = await nc_mcp_client.list_tools()
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# Known read-only tools (list, search, get operations)
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read_only_prefixes = ["list", "search", "get"]
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read_only_patterns = ["_get_", "_list_", "_search_"]
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for tool in tools.tools:
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# Check if tool name suggests it's read-only
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is_likely_readonly = tool.name.startswith(tuple(read_only_prefixes)) or any(
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pattern in tool.name for pattern in read_only_patterns
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)
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if is_likely_readonly:
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assert tool.annotations is not None, f"Tool {tool.name} missing annotations"
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assert tool.annotations.readOnlyHint is True, (
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f"Read-only tool {tool.name} should have readOnlyHint=True"
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)
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assert tool.annotations.destructiveHint is not True, (
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f"Read-only tool {tool.name} should not have destructiveHint=True"
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)
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async def test_destructive_tools_have_correct_annotations(nc_mcp_client: ClientSession):
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"""Verify destructive operations are marked correctly."""
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tools = await nc_mcp_client.list_tools()
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# Known destructive operations
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destructive_keywords = ["delete", "remove", "revoke"]
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for tool in tools.tools:
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has_destructive_keyword = any(
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keyword in tool.name.lower() for keyword in destructive_keywords
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)
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if has_destructive_keyword:
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assert tool.annotations is not None, f"Tool {tool.name} missing annotations"
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assert tool.annotations.destructiveHint is True, (
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f"Destructive tool {tool.name} should have destructiveHint=True"
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)
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async def test_delete_operations_are_idempotent(nc_mcp_client: ClientSession):
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"""Verify delete operations are marked as idempotent (ADR-017 decision)."""
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tools = await nc_mcp_client.list_tools()
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for tool in tools.tools:
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if "delete" in tool.name.lower():
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assert tool.annotations is not None, f"Tool {tool.name} missing annotations"
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assert tool.annotations.idempotentHint is True, (
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f"Delete tool {tool.name} should be idempotent (same end state)"
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)
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async def test_create_operations_not_idempotent(nc_mcp_client: ClientSession):
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"""Verify create operations are marked as non-idempotent."""
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tools = await nc_mcp_client.list_tools()
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for tool in tools.tools:
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if "create" in tool.name.lower() and "calendar_create_meeting" not in tool.name:
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assert tool.annotations is not None, f"Tool {tool.name} missing annotations"
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assert tool.annotations.idempotentHint is not True, (
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f"Create tool {tool.name} should not be idempotent (creates new resources)"
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)
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async def test_update_operations_not_idempotent(nc_mcp_client: ClientSession):
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"""Verify update operations are marked as non-idempotent (due to etag requirements)."""
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tools = await nc_mcp_client.list_tools()
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for tool in tools.tools:
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if "update" in tool.name.lower():
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assert tool.annotations is not None, f"Tool {tool.name} missing annotations"
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# Most updates use etags which change each time, making them non-idempotent
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# Exception: calendar_update_event might be different
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assert tool.annotations.idempotentHint is not True, (
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f"Update tool {tool.name} should not be idempotent (etag changes)"
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)
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async def test_webdav_write_is_idempotent(nc_mcp_client: ClientSession):
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"""Verify nc_webdav_write_file is marked as idempotent (ADR-017 decision).
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WebDAV write uses HTTP PUT without version control, making it idempotent.
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Writing same content to same path repeatedly produces same end state.
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"""
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tools = await nc_mcp_client.list_tools()
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write_tool = next(
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(tool for tool in tools.tools if tool.name == "nc_webdav_write_file"), None
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)
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assert write_tool is not None, "nc_webdav_write_file tool not found"
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assert write_tool.annotations is not None, "write_file missing annotations"
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assert write_tool.annotations.idempotentHint is True, (
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"nc_webdav_write_file should be idempotent (HTTP PUT without version control)"
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)
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async def test_semantic_search_open_world(nc_mcp_client: ClientSession):
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"""Verify semantic search has openWorldHint=True (ADR-017 decision).
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Semantic search queries external Nextcloud service, consistent with other tools.
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"""
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tools = await nc_mcp_client.list_tools()
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semantic_tool = next(
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(tool for tool in tools.tools if tool.name == "nc_semantic_search"), None
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)
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if semantic_tool: # Only if semantic search is enabled
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assert semantic_tool.annotations is not None, (
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"semantic_search missing annotations"
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)
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assert semantic_tool.annotations.openWorldHint is True, (
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"nc_semantic_search should have openWorldHint=True (queries external service)"
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)
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async def test_annotation_consistency(nc_mcp_client: ClientSession):
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"""Verify annotation consistency across similar tools."""
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tools = await nc_mcp_client.list_tools()
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# Group tools by category
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categories = {
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"notes": [],
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"calendar": [],
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"contacts": [],
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"webdav": [],
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"tables": [],
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"deck": [],
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"cookbook": [],
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"sharing": [],
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}
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for tool in tools.tools:
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for category in categories:
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if tool.name.startswith(f"nc_{category}_"):
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categories[category].append(tool)
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# Within each category, similar operations should have similar annotations
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for category, category_tools in categories.items():
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# All list/search/get operations should be read-only
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read_ops = [
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t
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for t in category_tools
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if any(op in t.name for op in ["list", "search", "get"])
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]
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for tool in read_ops:
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assert tool.annotations.readOnlyHint is True, (
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f"{tool.name} is a read operation but not marked read-only"
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)
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# All delete operations should be destructive and idempotent
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delete_ops = [t for t in category_tools if "delete" in t.name]
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for tool in delete_ops:
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assert tool.annotations.destructiveHint is True, (
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f"{tool.name} is a delete operation but not marked destructive"
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)
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assert tool.annotations.idempotentHint is True, (
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f"{tool.name} is a delete operation but not marked idempotent"
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)
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