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perf(mcp): Load the server stack only when the stdio server starts #1764

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Merged
BYK merged 1 commit into from
Oct 31, 2026
Merged

perf(mcp): Load the server stack only when the stdio server starts #1764

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39 changes: 26 additions & 13 deletions packages/mcp-server/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -22,25 +22,16 @@

import { pathToFileURL } from "node:url";

import {
getAgentProvider,
getResolvedProviderType,
setAgentProvider,
setProviderBaseUrls,
} from "@sentry/mcp-core/internal/agents/provider-factory";
import { buildServer } from "@sentry/mcp-core/server";
// Keep static imports light: `--help`, `--version`, and argument errors must
// not load the tools, the AI SDK, or the Sentry SDK. The server stack is
// imported in runMcpServer() once the server is about to start.
import { SKILLS } from "@sentry/mcp-core/skills";
import { sentryBeforeSend } from "@sentry/mcp-core/telem/sentry";
import { LIB_VERSION } from "@sentry/mcp-core/version";
import * as Sentry from "@sentry/node";
import { resolveAccessToken } from "./auth/resolve-token";
import { authCommand } from "./cli/commands/auth";
import { printCliLine } from "./cli/output";
import { merge, parseArgv, parseEnv } from "./cli/parse";
import { finalize } from "./cli/resolve";
import type { PartiallyResolvedConfig } from "./cli/types";
import { buildUsage } from "./cli/usage";
import { startStdio } from "./transports/stdio";

const defaultPackageName = "@sentry/mcp-server";
const allSkills = Object.keys(SKILLS) as ReadonlyArray<
Expand Down Expand Up @@ -95,6 +86,7 @@ export async function runMcpServer(
new Error("Use `sentry auth` to manage credentials for `sentry mcp`."),
);
}
const { authCommand } = await import("./cli/commands/auth");
await authCommand(rawArgs.slice(1));
return;
}
Expand Down Expand Up @@ -130,11 +122,32 @@ export async function runMcpServer(
...partialCfg,
accessToken,
}))
: resolveAccessToken(partialCfg)
: import("./auth/resolve-token").then(({ resolveAccessToken }) =>
resolveAccessToken(partialCfg),
)
).catch((err) => {
die(err);
});

const [
{
getAgentProvider,
getResolvedProviderType,
setAgentProvider,
setProviderBaseUrls,
},
{ buildServer },
{ sentryBeforeSend },
Sentry,
{ startStdio },
] = await Promise.all([
import("@sentry/mcp-core/internal/agents/provider-factory"),
import("@sentry/mcp-core/server"),
import("@sentry/mcp-core/telem/sentry"),
import("@sentry/node"),
import("./transports/stdio"),
]);

// Configure embedded agent provider
if (cfg.agentProvider) {
setAgentProvider(cfg.agentProvider);
Expand Down
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