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fix: return isError instead of throwing McpError for missing API key #162

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fix: return isError instead of throwing McpError for missing API key #162

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14 changes: 9 additions & 5 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -437,12 +437,16 @@ class TavilyClient {
});

this.server.setRequestHandler(CallToolRequestSchema, async (request: any) => {
// Check for API key at request time and return proper JSON-RPC error
// Return a graceful isError response when the API key is missing,
// so agents can self-correct instead of seeing a server crash.
if (!API_KEY) {
throw new McpError(
ErrorCode.InvalidRequest,
"TAVILY_API_KEY environment variable is required. Please set it before using this MCP server."
);
return {
content: [{
type: "text",
text: "TAVILY_API_KEY environment variable is required. Please set it before using this MCP server."
}],
isError: true,
};
}

try {
Expand Down