refactor: load MCP tools from YAML config-as-code - #80
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📝 WalkthroughSummary by CodeRabbit
WalkthroughThe server now loads MCP tool metadata from YAML files, imports handlers dynamically, builds callable wrappers, and registers enabled tools at startup. Documentation, packaging, settings, bundled configurations, and loader tests now support the configuration-driven workflow. ChangesYAML Tool Architecture
Estimated code review effort: 4 (Complex) | ~45 minutes Mergeability Score: 🟡 Moderate · up to YAML-driven registration can silently enable a tool when its configuration contains a misspelled field, causing an unintended tool to be exposed and invoked. This configuration correctness risk should be fixed before merge; the other findings are documentation and lint follow-up. Sequence Diagram(s)sequenceDiagram
participant MCPServer
participant ToolLoader
participant YAMLConfig
participant ToolHandler
MCPServer->>ToolLoader: load_tool_registry()
ToolLoader->>YAMLConfig: load and validate tool definitions
ToolLoader->>ToolHandler: import and wrap handler
ToolLoader-->>MCPServer: return enabled tool registry
MCPServer->>ToolHandler: invoke registered tool
ToolHandler-->>MCPServer: return result
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Codecov Report✅ All modified and coverable lines are covered by tests. 📢 Thoughts on this report? Let us know! |
Move tool surface (name, params, agent metadata) into config/tools/*.yaml with explicit handler references, while keeping behavior in Python handlers. Adds tools_loader, registry-driven FastMCP registration, and updated docs. Co-authored-by: Cursor <cursoragent@cursor.com> Signed-off-by: ipbabble <william_henry@mac.com>
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Actionable comments posted: 4
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Inline comments:
In `@CONTRIBUTING.md`:
- Around line 207-230: Update the “Add tool config” documentation near the YAML
example to state that each tool name must be unique across the tool
configuration files in template_mcp_server/config/tools/, because duplicate
names are rejected by load_tool_configs before registration. Keep the existing
setup instructions unchanged.
In `@README.md`:
- Line 124: Update the directory-tree code fences to include the text language
tag: change the opening fence at README.md lines 124-124 and
docs/architecture.md lines 123-123 to ```text, resolving MD040 without altering
the displayed tree content.
In `@template_mcp_server/src/README.md`:
- Around line 27-29: Correct the configuration directory references: in
template_mcp_server/src/README.md lines 27-29, update the configuration step to
../config/tools/your_domain_tool.yaml; in
template_mcp_server/src/tools/README.md line 3, update the Markdown link target
to ../../config/tools/.
In `@template_mcp_server/src/tools_loader.py`:
- Around line 55-64: Configure ToolConfig, ToolParamConfig, and AgentMetadata to
reject unknown YAML fields by setting their Pydantic model configuration to
extra="forbid", preventing misspelled keys from being silently ignored. Add
coverage verifying that loading data with an unknown field raises validation
failure.
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📒 Files selected for processing (23)
.env.example.pre-commit-config.yamlCONTRIBUTING.mdREADME.mddocs/architecture.mddocs/development.mddocs/tutorial.mdexamples/README.mdpyproject.tomltemplate_mcp_server/config/tools/README.mdtemplate_mcp_server/config/tools/generate_code_review_prompt.yamltemplate_mcp_server/config/tools/get_redhat_logo.yamltemplate_mcp_server/config/tools/multiply_numbers.yamltemplate_mcp_server/src/README.mdtemplate_mcp_server/src/mcp.pytemplate_mcp_server/src/settings.pytemplate_mcp_server/src/tools/README.mdtemplate_mcp_server/src/tools/code_review_tool.pytemplate_mcp_server/src/tools/multiply_tool.pytemplate_mcp_server/src/tools/redhat_logo_tool.pytemplate_mcp_server/src/tools_loader.pytests/README.mdtests/test_tools_loader.py
Reject unknown YAML fields via Pydantic extra=forbid, expand loader test coverage, fix doc paths, and document unique tool name requirement. Signed-off-by: ipbabble <william_henry@mac.com> Co-authored-by: Cursor <cursoragent@cursor.com>
Provide a copy-paste tool_template.yaml.example beside live configs and link it from config/tools/README.md so new tools start from a documented skeleton. Signed-off-by: ipbabble <william_henry@mac.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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Upon request, I am moving the commits form this the deep-agent branch. I have squashed the config-as-code owrk into a single commit. |
2 participants
Summary
template_mcp_server/config/tools/tools_loader.pyto validate YAML, import handlers via explicithandler: module:attr, and build FastMCP callables (name, signature, docstring)mcp.py— no hardcoded tool importssrc/tools/MCP_TOOLS_CONFIG_PATHenv override for mounted config dirsTest plan
pytest— 318 passedtests/test_tools_loader.py— YAML load, registry, wrapper delegation, disabled toolstools/listreturns 3 tools with YAML metadatamultiply_numbersworksMade with Cursor