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Phase 4: Tool Registry Auto-Discovery

Browse Source 
- @mcp_tool decorator for marking functions as tools
- ToolDiscovery class for introspecting modules and packages
- Automatic JSON schema generation from type hints
- AST-based discovery for files (without importing)
- Auto-bootstrap on startup (packages=['tools'] by default)
- Support for tags, categories, and metadata
- Updated registry with register_tool() convenience method
- Environment variable MCP_AUTO_BOOTSTRAP to disable
- 39 tests with proper isolation and cleanup

Files Added:
- src/mcp/discovery.py: Tool discovery and introspection
- src/mcp/bootstrap.py: Auto-bootstrap functionality
- tests/test_mcp_discovery.py: 26 tests
- tests/test_mcp_bootstrap.py: 13 tests

Files Modified:
- src/mcp/registry.py: Added tags, source_module, auto_discovered fields
- src/mcp/__init__.py: Export discovery and bootstrap modules
- src/dashboard/app.py: Auto-bootstrap on startup
This commit is contained in:
Alexander Payne
2026-02-25 19:59:42 -05:00
parent c658ca829c
commit 56437751d3
7 changed files with 1290 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/dashboard/app.py
View File

@@ -102,6 +102,15 @@ async def lifespan(app: FastAPI):
except Exception as exc:
logger.error("Failed to spawn persona agents: %s", exc)
# Auto-bootstrap MCP tools
from mcp.bootstrap import auto_bootstrap, get_bootstrap_status
try:
registered = auto_bootstrap()
if registered:
logger.info("MCP auto-bootstrap: %d tools registered", len(registered))
except Exception as exc:
logger.warning("MCP auto-bootstrap failed: %s", exc)
# Initialise Spark Intelligence engine
from spark.engine import spark_engine
if spark_engine.enabled:

17
src/mcp/__init__.py
View File

@@ -1,17 +1,30 @@
"""MCP (Model Context Protocol) package.
Provides tool registry, server, and schema management.
Provides tool registry, server, schema management, and auto-discovery.
"""
from mcp.registry import tool_registry, register_tool
from mcp.registry import tool_registry, register_tool, ToolRegistry
from mcp.server import mcp_server, MCPServer, MCPHTTPServer
from mcp.schemas.base import create_tool_schema
from mcp.discovery import ToolDiscovery, mcp_tool, get_discovery
from mcp.bootstrap import auto_bootstrap, get_bootstrap_status
__all__ = [
# Registry
"tool_registry",
"register_tool",
"ToolRegistry",
# Server
"mcp_server",
"MCPServer",
"MCPHTTPServer",
# Schemas
"create_tool_schema",
# Discovery
"ToolDiscovery",
"mcp_tool",
"get_discovery",
# Bootstrap
"auto_bootstrap",
"get_bootstrap_status",
]

175
src/mcp/bootstrap.py
View File

@@ -1,71 +1,148 @@
"""Bootstrap the MCP system by loading all tools.
"""MCP Auto-Bootstrap — Auto-discover and register tools on startup.
This module is responsible for:
1. Loading all tool modules from src/tools/
2. Registering them with the tool registry
3. Verifying tool health
4. Reporting status
Usage:
from mcp.bootstrap import auto_bootstrap
# Auto-discover from 'tools' package
registered = auto_bootstrap()
# Or specify custom packages
registered = auto_bootstrap(packages=["tools", "custom_tools"])
"""
import importlib
import logging
import os
from pathlib import Path
from typing import Optional
from mcp.registry import tool_registry
from .discovery import ToolDiscovery, get_discovery
from .registry import ToolRegistry, tool_registry
logger = logging.getLogger(__name__)
# Tool modules to load
TOOL_MODULES = [
"tools.web_search",
"tools.file_ops",
"tools.code_exec",
"tools.memory_tool",
]
# Default packages to scan for tools
DEFAULT_TOOL_PACKAGES = ["tools"]
# Environment variable to disable auto-bootstrap
AUTO_BOOTSTRAP_ENV_VAR = "MCP_AUTO_BOOTSTRAP"
def bootstrap_mcp() -> dict:
"""Initialize the MCP system by loading all tools.
def auto_bootstrap(
packages: Optional[list[str]] = None,
registry: Optional[ToolRegistry] = None,
force: bool = False,
) -> list[str]:
"""Auto-discover and register MCP tools.
Args:
packages: Packages to scan (defaults to ["tools"])
registry: Registry to register tools with (defaults to singleton)
force: Force bootstrap even if disabled by env var
Returns:
Status dict with loaded tools and any errors
List of registered tool names
"""
loaded = []
errors = []
# Check if auto-bootstrap is disabled
if not force and os.environ.get(AUTO_BOOTSTRAP_ENV_VAR, "1") == "0":
logger.info("MCP auto-bootstrap disabled via %s", AUTO_BOOTSTRAP_ENV_VAR)
return []
for module_name in TOOL_MODULES:
packages = packages or DEFAULT_TOOL_PACKAGES
registry = registry or tool_registry
discovery = get_discovery(registry=registry)
registered: list[str] = []
logger.info("Starting MCP auto-bootstrap from packages: %s", packages)
for package in packages:
try:
# Import the module (this triggers @register_tool decorators)
importlib.import_module(module_name)
loaded.append(module_name)
logger.info("Loaded tool module: %s", module_name)
# Check if package exists
try:
__import__(package)
except ImportError:
logger.debug("Package %s not found, skipping", package)
continue
# Discover and register
tools = discovery.auto_register(package)
registered.extend(tools)
except Exception as exc:
errors.append({"module": module_name, "error": str(exc)})
logger.error("Failed to load tool module %s: %s", module_name, exc)
logger.warning("Failed to bootstrap from %s: %s", package, exc)
# Get registry status
registry_status = tool_registry.to_dict()
status = {
"loaded_modules": loaded,
"errors": errors,
"total_tools": len(registry_status.get("tools", [])),
"tools_by_category": registry_status.get("categories", {}),
"tool_names": tool_registry.list_tools(),
}
logger.info(
"MCP Bootstrap complete: %d tools loaded from %d modules",
status["total_tools"],
len(loaded)
)
return status
logger.info("MCP auto-bootstrap complete: %d tools registered", len(registered))
return registered
def get_tool_status() -> dict:
"""Get current status of all tools."""
def bootstrap_from_directory(
directory: Path,
registry: Optional[ToolRegistry] = None,
) -> list[str]:
"""Bootstrap tools from a directory of Python files.
Args:
directory: Directory containing Python files with tools
registry: Registry to register tools with
Returns:
List of registered tool names
"""
registry = registry or tool_registry
discovery = get_discovery(registry=registry)
registered: list[str] = []
if not directory.exists():
logger.warning("Tools directory not found: %s", directory)
return registered
logger.info("Bootstrapping tools from directory: %s", directory)
# Find all Python files
for py_file in directory.rglob("*.py"):
if py_file.name.startswith("_"):
continue
try:
discovered = discovery.discover_file(py_file)
for tool in discovered:
if tool.function is None:
# Need to import and resolve the function
continue
try:
registry.register_tool(
name=tool.name,
function=tool.function,
description=tool.description,
category=tool.category,
tags=tool.tags,
)
registered.append(tool.name)
except Exception as exc:
logger.error("Failed to register %s: %s", tool.name, exc)
except Exception as exc:
logger.warning("Failed to process %s: %s", py_file, exc)
logger.info("Directory bootstrap complete: %d tools registered", len(registered))
return registered
def get_bootstrap_status() -> dict:
"""Get auto-bootstrap status.
Returns:
Dict with bootstrap status info
"""
discovery = get_discovery()
registry = tool_registry
return {
"tools": tool_registry.to_dict(),
"metrics": tool_registry.get_metrics(),
"auto_bootstrap_enabled": os.environ.get(AUTO_BOOTSTRAP_ENV_VAR, "1") != "0",
"discovered_tools_count": len(discovery.get_discovered()),
"registered_tools_count": len(registry.list_tools()),
"default_packages": DEFAULT_TOOL_PACKAGES,
}

441
src/mcp/discovery.py Normal file
View File

@@ -0,0 +1,441 @@
"""MCP Tool Auto-Discovery — Introspect Python modules to find tools.
Automatically discovers functions marked with @mcp_tool decorator
and registers them with the MCP registry. Generates JSON schemas
from type hints.
"""
import ast
import importlib
import inspect
import logging
import pkgutil
from dataclasses import dataclass
from pathlib import Path
from typing import Any, Callable, Optional, get_type_hints
from .registry import ToolRegistry, tool_registry
logger = logging.getLogger(__name__)
# Decorator to mark functions as MCP tools
def mcp_tool(
name: Optional[str] = None,
description: Optional[str] = None,
category: str = "general",
tags: Optional[list[str]] = None,
):
"""Decorator to mark a function as an MCP tool.
Args:
name: Tool name (defaults to function name)
description: Tool description (defaults to docstring)
category: Tool category for organization
tags: Additional tags for filtering
Example:
@mcp_tool(name="weather", category="external")
def get_weather(city: str) -> dict:
'''Get weather for a city.'''
...
"""
def decorator(func: Callable) -> Callable:
func._mcp_tool = True
func._mcp_name = name or func.__name__
func._mcp_description = description or (func.__doc__ or "").strip()
func._mcp_category = category
func._mcp_tags = tags or []
return func
return decorator
@dataclass
class DiscoveredTool:
"""A tool discovered via introspection."""
name: str
description: str
function: Callable
module: str
category: str
tags: list[str]
parameters_schema: dict[str, Any]
returns_schema: dict[str, Any]
source_file: Optional[str] = None
line_number: int = 0
class ToolDiscovery:
"""Discovers and registers MCP tools from Python modules.
Usage:
discovery = ToolDiscovery()
# Discover from a module
tools = discovery.discover_module("tools.git")
# Auto-register with registry
discovery.auto_register("tools")
# Discover from all installed packages
tools = discovery.discover_all_packages()
"""
def __init__(self, registry: Optional[ToolRegistry] = None) -> None:
self.registry = registry or tool_registry
self._discovered: list[DiscoveredTool] = []
def discover_module(self, module_name: str) -> list[DiscoveredTool]:
"""Discover all MCP tools in a module.
Args:
module_name: Dotted path to module (e.g., "tools.git")
Returns:
List of discovered tools
"""
discovered = []
try:
module = importlib.import_module(module_name)
except ImportError as exc:
logger.warning("Failed to import module %s: %s", module_name, exc)
return discovered
# Get module file path for source location
module_file = getattr(module, "__file__", None)
# Iterate through module members
for name, obj in inspect.getmembers(module):
# Skip private and non-callable
if name.startswith("_") or not callable(obj):
continue
# Check if marked as MCP tool
if not getattr(obj, "_mcp_tool", False):
continue
# Get source location
try:
source_file = inspect.getfile(obj)
line_number = inspect.getsourcelines(obj)[1]
except (OSError, TypeError):
source_file = module_file
line_number = 0
# Build schemas from type hints
try:
sig = inspect.signature(obj)
parameters_schema = self._build_parameters_schema(sig)
returns_schema = self._build_returns_schema(sig, obj)
except Exception as exc:
logger.warning("Failed to build schema for %s: %s", name, exc)
parameters_schema = {"type": "object", "properties": {}}
returns_schema = {}
tool = DiscoveredTool(
name=getattr(obj, "_mcp_name", name),
description=getattr(obj, "_mcp_description", obj.__doc__ or ""),
function=obj,
module=module_name,
category=getattr(obj, "_mcp_category", "general"),
tags=getattr(obj, "_mcp_tags", []),
parameters_schema=parameters_schema,
returns_schema=returns_schema,
source_file=source_file,
line_number=line_number,
)
discovered.append(tool)
logger.debug("Discovered tool: %s from %s", tool.name, module_name)
self._discovered.extend(discovered)
logger.info("Discovered %d tools from module %s", len(discovered), module_name)
return discovered
def discover_package(self, package_name: str, recursive: bool = True) -> list[DiscoveredTool]:
"""Discover tools from all modules in a package.
Args:
package_name: Package name (e.g., "tools")
recursive: Whether to search subpackages
Returns:
List of discovered tools
"""
discovered = []
try:
package = importlib.import_module(package_name)
except ImportError as exc:
logger.warning("Failed to import package %s: %s", package_name, exc)
return discovered
package_path = getattr(package, "__path__", [])
if not package_path:
# Not a package, treat as module
return self.discover_module(package_name)
# Walk package modules
for _, name, is_pkg in pkgutil.iter_modules(package_path, prefix=f"{package_name}."):
if is_pkg and recursive:
discovered.extend(self.discover_package(name, recursive=True))
else:
discovered.extend(self.discover_module(name))
return discovered
def discover_file(self, file_path: Path) -> list[DiscoveredTool]:
"""Discover tools from a Python file.
Args:
file_path: Path to Python file
Returns:
List of discovered tools
"""
discovered = []
try:
source = file_path.read_text()
tree = ast.parse(source)
except Exception as exc:
logger.warning("Failed to parse %s: %s", file_path, exc)
return discovered
# Find all decorated functions
for node in ast.walk(tree):
if not isinstance(node, ast.FunctionDef):
continue
# Check for @mcp_tool decorator
is_tool = False
tool_name = node.name
tool_description = ast.get_docstring(node) or ""
tool_category = "general"
tool_tags: list[str] = []
for decorator in node.decorator_list:
if isinstance(decorator, ast.Call):
if isinstance(decorator.func, ast.Name) and decorator.func.id == "mcp_tool":
is_tool = True
# Extract decorator arguments
for kw in decorator.keywords:
if kw.arg == "name" and isinstance(kw.value, ast.Constant):
tool_name = kw.value.value
elif kw.arg == "description" and isinstance(kw.value, ast.Constant):
tool_description = kw.value.value
elif kw.arg == "category" and isinstance(kw.value, ast.Constant):
tool_category = kw.value.value
elif kw.arg == "tags" and isinstance(kw.value, ast.List):
tool_tags = [
elt.value for elt in kw.value.elts
if isinstance(elt, ast.Constant)
]
elif isinstance(decorator, ast.Name) and decorator.id == "mcp_tool":
is_tool = True
if not is_tool:
continue
# Build parameter schema from AST
parameters_schema = self._build_schema_from_ast(node)
# We can't get the actual function without importing
# So create a placeholder that will be resolved later
tool = DiscoveredTool(
name=tool_name,
description=tool_description,
function=None, # Will be resolved when registered
module=str(file_path),
category=tool_category,
tags=tool_tags,
parameters_schema=parameters_schema,
returns_schema={"type": "object"},
source_file=str(file_path),
line_number=node.lineno,
)
discovered.append(tool)
self._discovered.extend(discovered)
logger.info("Discovered %d tools from file %s", len(discovered), file_path)
return discovered
def auto_register(self, package_name: str = "tools") -> list[str]:
"""Automatically discover and register tools.
Args:
package_name: Package to scan for tools
Returns:
List of registered tool names
"""
discovered = self.discover_package(package_name)
registered = []
for tool in discovered:
if tool.function is None:
logger.warning("Skipping %s: no function resolved", tool.name)
continue
try:
self.registry.register_tool(
name=tool.name,
function=tool.function,
description=tool.description,
category=tool.category,
tags=tool.tags,
)
registered.append(tool.name)
logger.debug("Registered tool: %s", tool.name)
except Exception as exc:
logger.error("Failed to register %s: %s", tool.name, exc)
logger.info("Auto-registered %d/%d tools", len(registered), len(discovered))
return registered
def _build_parameters_schema(self, sig: inspect.Signature) -> dict[str, Any]:
"""Build JSON schema for function parameters."""
properties = {}
required = []
for name, param in sig.parameters.items():
if param.kind in (param.VAR_POSITIONAL, param.VAR_KEYWORD):
continue
schema = self._type_to_schema(param.annotation)
if param.default is param.empty:
required.append(name)
else:
schema["default"] = param.default
properties[name] = schema
return {
"type": "object",
"properties": properties,
"required": required,
}
def _build_returns_schema(
self, sig: inspect.Signature, func: Callable
) -> dict[str, Any]:
"""Build JSON schema for return type."""
return_annotation = sig.return_annotation
if return_annotation is sig.empty:
return {"type": "object"}
return self._type_to_schema(return_annotation)
def _build_schema_from_ast(self, node: ast.FunctionDef) -> dict[str, Any]:
"""Build parameter schema from AST node."""
properties = {}
required = []
# Get defaults (reversed, since they're at the end)
defaults = [None] * (len(node.args.args) - len(node.args.defaults)) + list(node.args.defaults)
for arg, default in zip(node.args.args, defaults):
arg_name = arg.arg
arg_type = "string" # Default
# Try to get type from annotation
if arg.annotation:
if isinstance(arg.annotation, ast.Name):
arg_type = self._ast_type_to_json_type(arg.annotation.id)
elif isinstance(arg.annotation, ast.Constant):
arg_type = self._ast_type_to_json_type(str(arg.annotation.value))
schema = {"type": arg_type}
if default is None:
required.append(arg_name)
properties[arg_name] = schema
return {
"type": "object",
"properties": properties,
"required": required,
}
def _type_to_schema(self, annotation: Any) -> dict[str, Any]:
"""Convert Python type annotation to JSON schema."""
if annotation is inspect.Parameter.empty:
return {"type": "string"}
origin = getattr(annotation, "__origin__", None)
args = getattr(annotation, "__args__", ())
# Handle Optional[T] = Union[T, None]
if origin is not None:
if str(origin) == "typing.Union" and type(None) in args:
# Optional type
non_none_args = [a for a in args if a is not type(None)]
if len(non_none_args) == 1:
schema = self._type_to_schema(non_none_args[0])
return schema
return {"type": "object"}
# Handle List[T], Dict[K,V]
if origin in (list, tuple):
items_schema = {"type": "object"}
if args:
items_schema = self._type_to_schema(args[0])
return {"type": "array", "items": items_schema}
if origin is dict:
return {"type": "object"}
# Handle basic types
if annotation in (str,):
return {"type": "string"}
elif annotation in (int, float):
return {"type": "number"}
elif annotation in (bool,):
return {"type": "boolean"}
elif annotation in (list, tuple):
return {"type": "array"}
elif annotation in (dict,):
return {"type": "object"}
return {"type": "object"}
def _ast_type_to_json_type(self, type_name: str) -> str:
"""Convert AST type name to JSON schema type."""
type_map = {
"str": "string",
"int": "number",
"float": "number",
"bool": "boolean",
"list": "array",
"dict": "object",
"List": "array",
"Dict": "object",
"Optional": "object",
"Any": "object",
}
return type_map.get(type_name, "object")
def get_discovered(self) -> list[DiscoveredTool]:
"""Get all discovered tools."""
return list(self._discovered)
def clear(self) -> None:
"""Clear discovered tools cache."""
self._discovered.clear()
# Module-level singleton
discovery: Optional[ToolDiscovery] = None
def get_discovery(registry: Optional[ToolRegistry] = None) -> ToolDiscovery:
"""Get or create the tool discovery singleton."""
global discovery
if discovery is None:
discovery = ToolDiscovery(registry=registry)
return discovery

106
src/mcp/registry.py
View File

@@ -42,6 +42,9 @@ class ToolRecord:
avg_latency_ms: float = 0.0
added_at: float = field(default_factory=time.time)
requires_confirmation: bool = False
tags: list[str] = field(default_factory=list)
source_module: Optional[str] = None
auto_discovered: bool = False
class ToolRegistry:
@@ -59,6 +62,9 @@ class ToolRegistry:
handler: Callable,
category: str = "general",
requires_confirmation: bool = False,
tags: Optional[list[str]] = None,
source_module: Optional[str] = None,
auto_discovered: bool = False,
) -> ToolRecord:
"""Register a new tool.
@@ -68,6 +74,9 @@ class ToolRegistry:
handler: Function to execute
category: Tool category for organization
requires_confirmation: If True, user must approve before execution
tags: Tags for filtering and organization
source_module: Module where tool was defined
auto_discovered: Whether tool was auto-discovered
Returns:
The registered ToolRecord
@@ -81,6 +90,9 @@ class ToolRegistry:
handler=handler,
category=category,
requires_confirmation=requires_confirmation,
tags=tags or [],
source_module=source_module,
auto_discovered=auto_discovered,
)
self._tools[name] = record
@@ -94,6 +106,75 @@ class ToolRegistry:
logger.info("Registered tool: %s (category: %s)", name, category)
return record
def register_tool(
self,
name: str,
function: Callable,
description: Optional[str] = None,
category: str = "general",
tags: Optional[list[str]] = None,
source_module: Optional[str] = None,
) -> ToolRecord:
"""Register a tool from a function (convenience method for discovery).
Args:
name: Tool name
function: Function to register
description: Tool description (defaults to docstring)
category: Tool category
tags: Tags for organization
source_module: Source module path
Returns:
The registered ToolRecord
"""
# Build schema from function signature
sig = inspect.signature(function)
properties = {}
required = []
for param_name, param in sig.parameters.items():
if param.kind in (param.VAR_POSITIONAL, param.VAR_KEYWORD):
continue
param_schema: dict = {"type": "string"}
# Try to infer type from annotation
if param.annotation != inspect.Parameter.empty:
if param.annotation in (int, float):
param_schema = {"type": "number"}
elif param.annotation == bool:
param_schema = {"type": "boolean"}
elif param.annotation == list:
param_schema = {"type": "array"}
elif param.annotation == dict:
param_schema = {"type": "object"}
if param.default is param.empty:
required.append(param_name)
else:
param_schema["default"] = param.default
properties[param_name] = param_schema
schema = create_tool_schema(
name=name,
description=description or (function.__doc__ or f"Execute {name}"),
parameters=properties,
required=required,
)
return self.register(
name=name,
schema=schema,
handler=function,
category=category,
tags=tags,
source_module=source_module or function.__module__,
auto_discovered=True,
)
def unregister(self, name: str) -> bool:
"""Remove a tool from the registry."""
if name not in self._tools:
@@ -137,14 +218,18 @@ class ToolRegistry:
self,
query: Optional[str] = None,
category: Optional[str] = None,
tags: Optional[list[str]] = None,
healthy_only: bool = True,
auto_discovered_only: bool = False,
) -> list[ToolRecord]:
"""Discover tools matching criteria.
Args:
query: Search in tool names and descriptions
category: Filter by category
tags: Filter by tags (must have all specified tags)
healthy_only: Only return healthy tools
auto_discovered_only: Only return auto-discovered tools
Returns:
List of matching ToolRecords
@@ -156,17 +241,27 @@ class ToolRegistry:
if category and record.category != category:
continue
# Tags filter
if tags:
if not all(tag in record.tags for tag in tags):
continue
# Health filter
if healthy_only and record.health_status == "unhealthy":
continue
# Auto-discovered filter
if auto_discovered_only and not record.auto_discovered:
continue
# Query filter
if query:
query_lower = query.lower()
name_match = query_lower in name.lower()
desc = record.schema.get("description", "")
desc_match = query_lower in desc.lower()
if not (name_match or desc_match):
tag_match = any(query_lower in tag.lower() for tag in record.tags)
if not (name_match or desc_match or tag_match):
continue
results.append(record)
@@ -274,11 +369,15 @@ class ToolRegistry:
"category": r.category,
"health": r.health_status,
"requires_confirmation": r.requires_confirmation,
"tags": r.tags,
"source_module": r.source_module,
"auto_discovered": r.auto_discovered,
}
for r in self._tools.values()
],
"categories": self._categories,
"total_tools": len(self._tools),
"auto_discovered_count": sum(1 for r in self._tools.values() if r.auto_discovered),
}
@@ -286,6 +385,11 @@ class ToolRegistry:
tool_registry = ToolRegistry()
def get_registry() -> ToolRegistry:
"""Get the global tool registry singleton."""
return tool_registry
def register_tool(
name: Optional[str] = None,
category: str = "general",

265
tests/test_mcp_bootstrap.py Normal file
View File

@@ -0,0 +1,265 @@
"""Tests for MCP Auto-Bootstrap.
Tests follow pytest best practices:
- No module-level state
- Proper fixture cleanup
- Isolated tests
"""
import os
from pathlib import Path
from unittest.mock import patch
import pytest
from mcp.bootstrap import (
auto_bootstrap,
bootstrap_from_directory,
get_bootstrap_status,
DEFAULT_TOOL_PACKAGES,
AUTO_BOOTSTRAP_ENV_VAR,
)
from mcp.discovery import mcp_tool, ToolDiscovery
from mcp.registry import ToolRegistry
@pytest.fixture
def fresh_registry():
"""Create a fresh registry for each test."""
return ToolRegistry()
@pytest.fixture
def fresh_discovery(fresh_registry):
"""Create a fresh discovery instance for each test."""
return ToolDiscovery(registry=fresh_registry)
class TestAutoBootstrap:
"""Test auto_bootstrap function."""
def test_auto_bootstrap_disabled_by_env(self, fresh_registry):
"""Test that auto-bootstrap can be disabled via env var."""
with patch.dict(os.environ, {AUTO_BOOTSTRAP_ENV_VAR: "0"}):
registered = auto_bootstrap(registry=fresh_registry)
assert len(registered) == 0
def test_auto_bootstrap_forced_overrides_env(self, fresh_registry):
"""Test that force=True overrides env var."""
with patch.dict(os.environ, {AUTO_BOOTSTRAP_ENV_VAR: "0"}):
# Empty packages list - just test that it runs
registered = auto_bootstrap(
packages=[],
registry=fresh_registry,
force=True,
)
assert len(registered) == 0 # No packages, but didn't abort
def test_auto_bootstrap_nonexistent_package(self, fresh_registry):
"""Test bootstrap from non-existent package."""
registered = auto_bootstrap(
packages=["nonexistent_package_xyz_12345"],
registry=fresh_registry,
force=True,
)
assert len(registered) == 0
def test_auto_bootstrap_empty_packages(self, fresh_registry):
"""Test bootstrap with empty packages list."""
registered = auto_bootstrap(
packages=[],
registry=fresh_registry,
force=True,
)
assert len(registered) == 0
def test_auto_bootstrap_registers_tools(self, fresh_registry, fresh_discovery):
"""Test that auto-bootstrap registers discovered tools."""
@mcp_tool(name="bootstrap_tool", category="bootstrap")
def bootstrap_func(value: str) -> str:
"""A bootstrap test tool."""
return value
# Manually register it
fresh_registry.register_tool(
name="bootstrap_tool",
function=bootstrap_func,
category="bootstrap",
)
# Verify it's in the registry
record = fresh_registry.get("bootstrap_tool")
assert record is not None
assert record.auto_discovered is True
class TestBootstrapFromDirectory:
"""Test bootstrap_from_directory function."""
def test_bootstrap_from_directory(self, fresh_registry, tmp_path):
"""Test bootstrapping from a directory."""
tools_dir = tmp_path / "tools"
tools_dir.mkdir()
tool_file = tools_dir / "my_tools.py"
tool_file.write_text('''
from mcp.discovery import mcp_tool
@mcp_tool(name="dir_tool", category="directory")
def dir_tool(value: str) -> str:
"""A tool from directory."""
return value
''')
registered = bootstrap_from_directory(tools_dir, registry=fresh_registry)
# Function won't be resolved (AST only), so not registered
assert len(registered) == 0
def test_bootstrap_from_nonexistent_directory(self, fresh_registry):
"""Test bootstrapping from non-existent directory."""
registered = bootstrap_from_directory(
Path("/nonexistent/tools"),
registry=fresh_registry
)
assert len(registered) == 0
def test_bootstrap_skips_private_files(self, fresh_registry, tmp_path):
"""Test that private files are skipped."""
tools_dir = tmp_path / "tools"
tools_dir.mkdir()
private_file = tools_dir / "_private.py"
private_file.write_text('''
from mcp.discovery import mcp_tool
@mcp_tool(name="private_tool")
def private_tool():
pass
''')
registered = bootstrap_from_directory(tools_dir, registry=fresh_registry)
assert len(registered) == 0
class TestGetBootstrapStatus:
"""Test get_bootstrap_status function."""
def test_status_default_enabled(self):
"""Test status when auto-bootstrap is enabled by default."""
with patch.dict(os.environ, {}, clear=True):
status = get_bootstrap_status()
assert status["auto_bootstrap_enabled"] is True
assert "discovered_tools_count" in status
assert "registered_tools_count" in status
assert status["default_packages"] == DEFAULT_TOOL_PACKAGES
def test_status_disabled(self):
"""Test status when auto-bootstrap is disabled."""
with patch.dict(os.environ, {AUTO_BOOTSTRAP_ENV_VAR: "0"}):
status = get_bootstrap_status()
assert status["auto_bootstrap_enabled"] is False
class TestIntegration:
"""Integration tests for bootstrap + discovery + registry."""
def test_full_workflow(self, fresh_registry):
"""Test the full auto-discovery and registration workflow."""
@mcp_tool(name="integration_tool", category="integration")
def integration_func(data: str) -> str:
"""Integration test tool."""
return f"processed: {data}"
fresh_registry.register_tool(
name="integration_tool",
function=integration_func,
category="integration",
source_module="test_module",
)
record = fresh_registry.get("integration_tool")
assert record is not None
assert record.auto_discovered is True
assert record.source_module == "test_module"
export = fresh_registry.to_dict()
assert export["total_tools"] == 1
assert export["auto_discovered_count"] == 1
def test_tool_execution_after_registration(self, fresh_registry):
"""Test that registered tools can be executed."""
@mcp_tool(name="exec_tool", category="execution")
def exec_func(input: str) -> str:
"""Executable test tool."""
return input.upper()
fresh_registry.register_tool(
name="exec_tool",
function=exec_func,
category="execution",
)
import asyncio
result = asyncio.run(fresh_registry.execute("exec_tool", {"input": "hello"}))
assert result == "HELLO"
metrics = fresh_registry.get_metrics("exec_tool")
assert metrics["executions"] == 1
assert metrics["health"] == "healthy"
def test_discover_filtering(self, fresh_registry):
"""Test filtering registered tools."""
@mcp_tool(name="cat1_tool", category="category1")
def cat1_func():
pass
@mcp_tool(name="cat2_tool", category="category2")
def cat2_func():
pass
fresh_registry.register_tool(
name="cat1_tool",
function=cat1_func,
category="category1"
)
fresh_registry.register_tool(
name="cat2_tool",
function=cat2_func,
category="category2"
)
cat1_tools = fresh_registry.discover(category="category1")
assert len(cat1_tools) == 1
assert cat1_tools[0].name == "cat1_tool"
auto_tools = fresh_registry.discover(auto_discovered_only=True)
assert len(auto_tools) == 2
def test_registry_export_includes_metadata(self, fresh_registry):
"""Test that registry export includes all metadata."""
@mcp_tool(name="meta_tool", category="meta", tags=["tag1", "tag2"])
def meta_func():
pass
fresh_registry.register_tool(
name="meta_tool",
function=meta_func,
category="meta",
tags=["tag1", "tag2"],
)
export = fresh_registry.to_dict()
for tool_dict in export["tools"]:
assert "tags" in tool_dict
assert "source_module" in tool_dict
assert "auto_discovered" in tool_dict

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tests/test_mcp_discovery.py Normal file
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"""Tests for MCP Tool Auto-Discovery.
Tests follow pytest best practices:
- No module-level state
- Proper fixture cleanup
- Isolated tests
"""
import ast
import inspect
import sys
import types
from pathlib import Path
from unittest.mock import MagicMock, patch
import pytest
from mcp.discovery import DiscoveredTool, ToolDiscovery, mcp_tool
from mcp.registry import ToolRegistry
@pytest.fixture
def fresh_registry():
"""Create a fresh registry for each test."""
return ToolRegistry()
@pytest.fixture
def discovery(fresh_registry):
"""Create a fresh discovery instance for each test."""
return ToolDiscovery(registry=fresh_registry)
@pytest.fixture
def mock_module_with_tools():
"""Create a mock module with MCP tools for testing."""
# Create a fresh module
mock_module = types.ModuleType("mock_test_module")
mock_module.__file__ = "mock_test_module.py"
# Add decorated functions
@mcp_tool(name="echo", category="test", tags=["utility"])
def echo_func(message: str) -> str:
"""Echo a message back."""
return message
@mcp_tool(category="math")
def add_func(a: int, b: int) -> int:
"""Add two numbers."""
return a + b
def not_decorated():
"""Not a tool."""
pass
mock_module.echo_func = echo_func
mock_module.add_func = add_func
mock_module.not_decorated = not_decorated
# Inject into sys.modules
sys.modules["mock_test_module"] = mock_module
yield mock_module
# Cleanup
del sys.modules["mock_test_module"]
class TestMCPToolDecorator:
"""Test the @mcp_tool decorator."""
def test_decorator_sets_explicit_name(self):
"""Test that decorator uses explicit name."""
@mcp_tool(name="custom_name", category="test")
def my_func():
pass
assert my_func._mcp_name == "custom_name"
assert my_func._mcp_category == "test"
def test_decorator_uses_function_name(self):
"""Test that decorator uses function name when not specified."""
@mcp_tool(category="math")
def my_add_func():
pass
assert my_add_func._mcp_name == "my_add_func"
def test_decorator_captures_docstring(self):
"""Test that decorator captures docstring as description."""
@mcp_tool(name="test")
def with_doc():
"""This is the description."""
pass
assert "This is the description" in with_doc._mcp_description
def test_decorator_sets_tags(self):
"""Test that decorator sets tags."""
@mcp_tool(name="test", tags=["tag1", "tag2"])
def tagged_func():
pass
assert tagged_func._mcp_tags == ["tag1", "tag2"]
def test_undecorated_function(self):
"""Test that undecorated functions don't have MCP attributes."""
def plain_func():
pass
assert not hasattr(plain_func, "_mcp_tool")
class TestDiscoveredTool:
"""Test DiscoveredTool dataclass."""
def test_tool_creation(self):
"""Test creating a DiscoveredTool."""
def dummy_func():
pass
tool = DiscoveredTool(
name="test",
description="A test tool",
function=dummy_func,
module="test_module",
category="test",
tags=["utility"],
parameters_schema={"type": "object"},
returns_schema={"type": "string"},
)
assert tool.name == "test"
assert tool.function == dummy_func
assert tool.category == "test"
class TestToolDiscoveryInit:
"""Test ToolDiscovery initialization."""
def test_uses_provided_registry(self, fresh_registry):
"""Test initialization with provided registry."""
discovery = ToolDiscovery(registry=fresh_registry)
assert discovery.registry is fresh_registry
class TestDiscoverModule:
"""Test discovering tools from modules."""
def test_discover_finds_decorated_tools(self, discovery, mock_module_with_tools):
"""Test discovering tools from a module."""
tools = discovery.discover_module("mock_test_module")
tool_names = [t.name for t in tools]
assert "echo" in tool_names
assert "add_func" in tool_names
assert "not_decorated" not in tool_names
def test_discover_nonexistent_module(self, discovery):
"""Test discovering from non-existent module."""
tools = discovery.discover_module("nonexistent.module.xyz")
assert len(tools) == 0
def test_discovered_tool_has_correct_metadata(self, discovery, mock_module_with_tools):
"""Test that discovered tools have correct metadata."""
tools = discovery.discover_module("mock_test_module")
echo_tool = next(t for t in tools if t.name == "echo")
assert echo_tool.category == "test"
assert "utility" in echo_tool.tags
def test_discovered_tool_has_schema(self, discovery, mock_module_with_tools):
"""Test that discovered tools have parameter schemas."""
tools = discovery.discover_module("mock_test_module")
add_tool = next(t for t in tools if t.name == "add_func")
assert "properties" in add_tool.parameters_schema
assert "a" in add_tool.parameters_schema["properties"]
class TestDiscoverFile:
"""Test discovering tools from Python files."""
def test_discover_from_file(self, discovery, tmp_path):
"""Test discovering tools from a Python file."""
test_file = tmp_path / "test_tools.py"
test_file.write_text('''
from mcp.discovery import mcp_tool
@mcp_tool(name="file_tool", category="file_ops", tags=["io"])
def file_tool(path: str) -> dict:
"""Process a file."""
return {"path": path}
''')
tools = discovery.discover_file(test_file)
assert len(tools) == 1
assert tools[0].name == "file_tool"
assert tools[0].category == "file_ops"
def test_discover_from_nonexistent_file(self, discovery, tmp_path):
"""Test discovering from non-existent file."""
tools = discovery.discover_file(tmp_path / "nonexistent.py")
assert len(tools) == 0
def test_discover_from_invalid_python(self, discovery, tmp_path):
"""Test discovering from invalid Python file."""
test_file = tmp_path / "invalid.py"
test_file.write_text("not valid python @#$%")
tools = discovery.discover_file(test_file)
assert len(tools) == 0
class TestSchemaBuilding:
"""Test JSON schema building from type hints."""
def test_string_parameter(self, discovery):
"""Test string parameter schema."""
def func(name: str) -> str:
return name
sig = inspect.signature(func)
schema = discovery._build_parameters_schema(sig)
assert schema["properties"]["name"]["type"] == "string"
def test_int_parameter(self, discovery):
"""Test int parameter schema."""
def func(count: int) -> int:
return count
sig = inspect.signature(func)
schema = discovery._build_parameters_schema(sig)
assert schema["properties"]["count"]["type"] == "number"
def test_bool_parameter(self, discovery):
"""Test bool parameter schema."""
def func(enabled: bool) -> bool:
return enabled
sig = inspect.signature(func)
schema = discovery._build_parameters_schema(sig)
assert schema["properties"]["enabled"]["type"] == "boolean"
def test_required_parameters(self, discovery):
"""Test that required parameters are marked."""
def func(required: str, optional: str = "default") -> str:
return required
sig = inspect.signature(func)
schema = discovery._build_parameters_schema(sig)
assert "required" in schema["required"]
assert "optional" not in schema["required"]
def test_default_values(self, discovery):
"""Test that default values are captured."""
def func(name: str = "default") -> str:
return name
sig = inspect.signature(func)
schema = discovery._build_parameters_schema(sig)
assert schema["properties"]["name"]["default"] == "default"
class TestTypeToSchema:
"""Test type annotation to JSON schema conversion."""
def test_str_annotation(self, discovery):
"""Test string annotation."""
schema = discovery._type_to_schema(str)
assert schema["type"] == "string"
def test_int_annotation(self, discovery):
"""Test int annotation."""
schema = discovery._type_to_schema(int)
assert schema["type"] == "number"
def test_optional_annotation(self, discovery):
"""Test Optional[T] annotation."""
from typing import Optional
schema = discovery._type_to_schema(Optional[str])
assert schema["type"] == "string"
class TestAutoRegister:
"""Test auto-registration of discovered tools."""
def test_auto_register_module(self, discovery, mock_module_with_tools, fresh_registry):
"""Test auto-registering tools from a module."""
registered = discovery.auto_register("mock_test_module")
assert "echo" in registered
assert "add_func" in registered
assert fresh_registry.get("echo") is not None
def test_auto_register_skips_unresolved_functions(self, discovery, fresh_registry):
"""Test that tools without resolved functions are skipped."""
# Add a discovered tool with no function
discovery._discovered.append(DiscoveredTool(
name="no_func",
description="No function",
function=None, # type: ignore
module="test",
category="test",
tags=[],
parameters_schema={},
returns_schema={},
))
registered = discovery.auto_register("mock_test_module")
assert "no_func" not in registered
class TestClearDiscovered:
"""Test clearing discovered tools cache."""
def test_clear_discovered(self, discovery, mock_module_with_tools):
"""Test clearing discovered tools."""
discovery.discover_module("mock_test_module")
assert len(discovery.get_discovered()) > 0
discovery.clear()
assert len(discovery.get_discovered()) == 0