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6bedc74 041303e 6bedc74 041303e 6bedc74 041303e 6bedc74 041303e 6bedc74 041303e 6bedc74 041303e 6bedc74 041303e 6bedc74 041303e 6bedc74 041303e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | from datetime import datetime, timezone
from time import perf_counter
from typing import Any, Dict
from src.schemas import ToolAuthorization, ToolCall, ToolResult
from src.tool_registry import TOOL_REGISTRY, get_tool
def _validate_arguments(
tool_name: str,
arguments: Dict[str, Any],
) -> None:
"""Validate arguments against the application-owned tool schema."""
if tool_name not in TOOL_REGISTRY:
raise ValueError(
f"Tool '{tool_name}' is not registered."
)
schema = TOOL_REGISTRY[tool_name]["parameters"]
properties = schema.get("properties", {})
required = schema.get("required", [])
allow_additional = schema.get(
"additionalProperties",
True,
)
for required_argument in required:
if required_argument not in arguments:
raise ValueError(
f"Missing required argument "
f"'{required_argument}' for tool "
f"'{tool_name}'."
)
if not allow_additional:
unknown_arguments = (
set(arguments.keys()) - set(properties.keys())
)
if unknown_arguments:
unknown = ", ".join(
sorted(unknown_arguments)
)
raise ValueError(
f"Unexpected argument(s) for tool "
f"'{tool_name}': {unknown}"
)
python_types = {
"string": str,
"integer": int,
"number": (int, float),
"boolean": bool,
"object": dict,
"array": list,
}
for argument_name, argument_value in arguments.items():
parameter_schema = properties.get(argument_name)
if not parameter_schema:
continue
expected_type_name = parameter_schema.get("type")
if not expected_type_name:
continue
expected_python_type = python_types.get(
expected_type_name
)
if expected_python_type is None:
continue
if not isinstance(
argument_value,
expected_python_type,
):
raise TypeError(
f"Argument '{argument_name}' for tool "
f"'{tool_name}' must be of type "
f"'{expected_type_name}'."
)
def authorize_tool_call(call: ToolCall) -> ToolAuthorization:
"""Decide whether a model-proposed tool call may execute."""
try:
_validate_arguments(
tool_name=call.tool_name,
arguments=call.arguments,
)
except Exception as exc:
return ToolAuthorization(
call_id=call.call_id,
tool_name=call.tool_name,
status="blocked",
reason=f"{type(exc).__name__}: {exc}",
)
return ToolAuthorization(
call_id=call.call_id,
tool_name=call.tool_name,
status="approved",
reason=(
"Tool is registered and arguments match the approved schema."
),
)
def execute_authorized_tool(
call: ToolCall,
authorization: ToolAuthorization,
) -> ToolResult:
"""Execute only a previously authorized call and normalize its result."""
started_at = datetime.now(timezone.utc)
timer_start = perf_counter()
if authorization.call_id != call.call_id:
raise ValueError("Authorization call_id does not match tool call.")
if authorization.tool_name != call.tool_name:
raise ValueError("Authorization tool_name does not match tool call.")
if authorization.status == "blocked":
completed_at = datetime.now(timezone.utc)
duration_ms = (perf_counter() - timer_start) * 1000
return ToolResult(
call_id=call.call_id,
tool_name=call.tool_name,
status="blocked",
output=None,
error=authorization.reason,
started_at=started_at,
completed_at=completed_at,
duration_ms=round(duration_ms, 3),
)
try:
tool = get_tool(call.tool_name)
output = tool(**call.arguments)
status = "success"
error = None
except Exception as exc:
output = None
status = "error"
error = f"{type(exc).__name__}: {exc}"
completed_at = datetime.now(timezone.utc)
duration_ms = (perf_counter() - timer_start) * 1000
return ToolResult(
call_id=call.call_id,
tool_name=call.tool_name,
status=status,
output=output,
error=error,
started_at=started_at,
completed_at=completed_at,
duration_ms=round(duration_ms, 3),
)
def execute_tool(call: ToolCall) -> ToolResult:
"""Authorize and execute one tool call through the controlled boundary."""
authorization = authorize_tool_call(call)
return execute_authorized_tool(
call=call,
authorization=authorization,
)
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