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Improve logging of tool arguments

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This commit is contained in:
Dominik Jain 2025-11-29 22:47:28 +01:00
parent 60acaec396
commit 81d6c70f39
1 changed files with 42 additions and 4 deletions
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46
mcp-server/src/Tool.ts
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@ -31,14 +31,12 @@ export abstract class Tool<TArgs extends object> {
* Executes the tool with automatic validation and type safety.
*
* This method handles the unknown args from the MCP protocol,
* validates them, and delegates to the type-safe implementation.
* delegating to the type-safe implementation.
*/
async execute(args: unknown): Promise<ToolResponse> {
try {
this.logger.info("Executing tool: %s", this.getToolName());
let argsInstance: TArgs = args as TArgs;
this.logger.debug("Tool args: %o", argsInstance);
this.logger.info("Executing tool: %s; arguments: %s", this.getToolName(), this.formatArgs(argsInstance));
// execute the actual tool logic
let result = await this.executeCore(argsInstance);
@ -51,6 +49,46 @@ export abstract class Tool<TArgs extends object> {
}
}
/**
* Formats tool arguments for readable logging.
*
* Multi-line strings are preserved with proper indentation.
*/
protected formatArgs(args: TArgs): string {
const formatted: string[] = [];
for (const [key, value] of Object.entries(args)) {
if (typeof value === "string" && value.includes("\n")) {
// multi-line string - preserve formatting with indentation
const indentedValue = value
.split("\n")
.map((line, index) => (index === 0 ? line : " " + line))
.join("\n");
formatted.push(` ${key}: ${indentedValue}`);
} else if (typeof value === "string") {
// single-line string
formatted.push(` ${key}: "${value}"`);
} else if (value === null || value === undefined) {
formatted.push(` ${key}: ${value}`);
} else {
// other types (numbers, booleans, objects, arrays)
const stringified = JSON.stringify(value, null, 2);
if (stringified.includes("\n")) {
// multi-line JSON - indent it
const indented = stringified
.split("\n")
.map((line, index) => (index === 0 ? line : " " + line))
.join("\n");
formatted.push(` ${key}: ${indented}`);
} else {
formatted.push(` ${key}: ${stringified}`);
}
}
}
return formatted.length > 0 ? "\n" + formatted.join("\n") : "{}";
}
public getInputSchema() {
return this.inputSchema;
}