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Merged
kesku merged 2 commits into from
Feb 25, 2026
Merged

minor mcp improvements #88

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6beba41
chore: extract makeApiRequest to eliminate duplicate fetch logic
kesku Feb 25, 2026
ae4a12b
fix: correct tool annotations (destructiveHint, idempotentHint)
kesku Feb 25, 2026
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4 changes: 2 additions & 2 deletions src/index.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -245,7 +245,7 @@ describe("Perplexity MCP Server", () => {
} as Response);

await expect(performSearch("test")).rejects.toThrow(
"Perplexity Search API error: 500 Internal Server Error"
"Perplexity API error: 500 Internal Server Error"
);
});

Expand Down Expand Up @@ -280,7 +280,7 @@ describe("Perplexity MCP Server", () => {
global.fetch = vi.fn().mockRejectedValue(new Error("Network failure"));

await expect(performSearch("test")).rejects.toThrow(
"Network error while calling Perplexity Search API"
"Network error while calling Perplexity API"
);
});
});
Expand Down
163 changes: 66 additions & 97 deletions src/server.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,61 @@ export function stripThinkingTokens(content: string): string {
return content.replace(/<think>[\s\S]*?<\/think>/g, '').trim();
}

async function makeApiRequest(
endpoint: string,
body: Record<string, unknown>,
serviceOrigin: string | undefined,
): Promise<Response> {
if (!PERPLEXITY_API_KEY) {
throw new Error("PERPLEXITY_API_KEY environment variable is required");
}

// Read timeout fresh each time to respect env var changes
const TIMEOUT_MS = parseInt(process.env.PERPLEXITY_TIMEOUT_MS || "300000", 10);

const url = new URL(`${PERPLEXITY_BASE_URL}/${endpoint}`);
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), TIMEOUT_MS);

let response;
try {
const headers: Record<string, string> = {
"Content-Type": "application/json",
"Authorization": `Bearer ${PERPLEXITY_API_KEY}`,
};
if (serviceOrigin) {
headers["X-Service"] = serviceOrigin;
}
response = await proxyAwareFetch(url.toString(), {
method: "POST",
headers,
body: JSON.stringify(body),
signal: controller.signal,
});
} catch (error) {
clearTimeout(timeoutId);
if (error instanceof Error && error.name === "AbortError") {
throw new Error(`Request timeout: Perplexity API did not respond within ${TIMEOUT_MS}ms. Consider increasing PERPLEXITY_TIMEOUT_MS.`);
}
throw new Error(`Network error while calling Perplexity API: ${error}`);
}
clearTimeout(timeoutId);

if (!response.ok) {
let errorText;
try {
errorText = await response.text();
} catch (parseError) {
errorText = "Unable to parse error response";
}
throw new Error(
`Perplexity API error: ${response.status} ${response.statusText}\n${errorText}`
);
}

return response;
}

export async function consumeSSEStream(response: Response): Promise<ChatCompletionResponse> {
const body = response.body;
if (!body) {
Expand Down Expand Up @@ -138,16 +193,8 @@ export async function performChatCompletion(
serviceOrigin?: string,
options?: ChatCompletionOptions
): Promise<string> {
if (!PERPLEXITY_API_KEY) {
throw new Error("PERPLEXITY_API_KEY environment variable is required");
}

// Read timeout fresh each time to respect env var changes
const TIMEOUT_MS = parseInt(process.env.PERPLEXITY_TIMEOUT_MS || "300000", 10);

const useStreaming = model === "sonar-deep-research";

const url = new URL(`${PERPLEXITY_BASE_URL}/chat/completions`);
const body: Record<string, unknown> = {
model: model,
messages: messages,
Expand All @@ -158,44 +205,7 @@ export async function performChatCompletion(
...(options?.reasoning_effort && { reasoning_effort: options.reasoning_effort }),
};

const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), TIMEOUT_MS);

let response;
try {
const headers: Record<string, string> = {
"Content-Type": "application/json",
"Authorization": `Bearer ${PERPLEXITY_API_KEY}`,
};
if (serviceOrigin) {
headers["X-Service"] = serviceOrigin;
}
response = await proxyAwareFetch(url.toString(), {
method: "POST",
headers,
body: JSON.stringify(body),
signal: controller.signal,
});
clearTimeout(timeoutId);
} catch (error) {
clearTimeout(timeoutId);
if (error instanceof Error && error.name === "AbortError") {
throw new Error(`Request timeout: Perplexity API did not respond within ${TIMEOUT_MS}ms. Consider increasing PERPLEXITY_TIMEOUT_MS.`);
}
throw new Error(`Network error while calling Perplexity API: ${error}`);
}

if (!response.ok) {
let errorText;
try {
errorText = await response.text();
} catch (parseError) {
errorText = "Unable to parse error response";
}
throw new Error(
`Perplexity API error: ${response.status} ${response.statusText}\n${errorText}`
);
}
const response = await makeApiRequest("chat/completions", body, serviceOrigin);

let data: ChatCompletionResponse;
try {
Expand Down Expand Up @@ -265,59 +275,14 @@ export async function performSearch(
country?: string,
serviceOrigin?: string
): Promise<string> {
if (!PERPLEXITY_API_KEY) {
throw new Error("PERPLEXITY_API_KEY environment variable is required");
}

// Read timeout fresh each time to respect env var changes
const TIMEOUT_MS = parseInt(process.env.PERPLEXITY_TIMEOUT_MS || "300000", 10);

const url = new URL(`${PERPLEXITY_BASE_URL}/search`);
const body: SearchRequestBody = {
const body: Record<string, unknown> = {
query: query,
max_results: maxResults,
max_tokens_per_page: maxTokensPerPage,
...(country && { country }),
};

const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), TIMEOUT_MS);

let response;
try {
const headers: Record<string, string> = {
"Content-Type": "application/json",
"Authorization": `Bearer ${PERPLEXITY_API_KEY}`,
};
if (serviceOrigin) {
headers["X-Service"] = serviceOrigin;
}
response = await proxyAwareFetch(url.toString(), {
method: "POST",
headers,
body: JSON.stringify(body),
signal: controller.signal,
});
clearTimeout(timeoutId);
} catch (error) {
clearTimeout(timeoutId);
if (error instanceof Error && error.name === "AbortError") {
throw new Error(`Request timeout: Perplexity Search API did not respond within ${TIMEOUT_MS}ms. Consider increasing PERPLEXITY_TIMEOUT_MS.`);
}
throw new Error(`Network error while calling Perplexity Search API: ${error}`);
}

if (!response.ok) {
let errorText;
try {
errorText = await response.text();
} catch (parseError) {
errorText = "Unable to parse error response";
}
throw new Error(
`Perplexity Search API error: ${response.status} ${response.statusText}\n${errorText}`
);
}
const response = await makeApiRequest("search", body, serviceOrigin);

let data: SearchResponse;
try {
Expand Down Expand Up @@ -408,7 +373,8 @@ export function createPerplexityServer(serviceOrigin?: string) {
annotations: {
readOnlyHint: true,
openWorldHint: true,
idempotentHint: true,
idempotentHint: false,
destructiveHint: false,
},
},
async (args: any) => {
Expand Down Expand Up @@ -447,7 +413,8 @@ export function createPerplexityServer(serviceOrigin?: string) {
annotations: {
readOnlyHint: true,
openWorldHint: true,
idempotentHint: true,
idempotentHint: false,
destructiveHint: false,
},
},
async (args: any) => {
Expand Down Expand Up @@ -484,7 +451,8 @@ export function createPerplexityServer(serviceOrigin?: string) {
annotations: {
readOnlyHint: true,
openWorldHint: true,
idempotentHint: true,
idempotentHint: false,
destructiveHint: false,
},
},
async (args: any) => {
Expand Down Expand Up @@ -537,7 +505,8 @@ export function createPerplexityServer(serviceOrigin?: string) {
annotations: {
readOnlyHint: true,
openWorldHint: true,
idempotentHint: true,
idempotentHint: false,
destructiveHint: false,
},
},
async (args: any) => {
Expand Down