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JavaScript
/**
* SystemPromptInjector — injects Claude Code session context blocks into the
* system prompt so that the request looks like it originates from a genuine
* Claude Code session (IDE metadata, session timestamp, etc.).
*
* This is designed for "cloaking" proxy requests to appear as native Claude
* Code interactions. Only applies to OAuth accounts — API key accounts are
* skipped since they do not need session mimicry.
*/
const DEFAULT_OPTIONS = {
ide: "vscode",
ideVersion: "1.96.2",
platform: "darwin",
cwd: "/Users/user/project",
};
/** Cached session start timestamp — set once on first call, reused for the process lifetime. */
let cachedSessionStartTs;
function generateSessionBlock(opts) {
if (!cachedSessionStartTs) {
cachedSessionStartTs = new Date().toISOString();
}
return [
"<env>",
`Working directory: ${opts.cwd}`,
"Is directory a git repo: Yes",
`Platform: ${opts.platform}`,
`IDE: ${opts.ide} ${opts.ideVersion}`,
`Session start: ${cachedSessionStartTs}`,
"</env>",
].join("\n");
}
export function createSystemPromptInjector(options = {}) {
const opts = { ...DEFAULT_OPTIONS, ...options };
return {
name: "system-prompt-injector",
order: 30,
enabled: true,
async transformRequest(ctx) {
// Only apply to OAuth accounts — API key accounts skip session mimicry
if (ctx.account.type === "api_key") {
return ctx;
}
const sessionBlock = generateSessionBlock(opts);
const preamble = (options.preamble ?? "").trim();
const existingSystem = ctx.request.body.system;
// Build the injected text from preamble + session block
const injectedParts = [];
if (preamble) {
injectedParts.push(preamble);
}
injectedParts.push(sessionBlock);
const injectedText = injectedParts.join("\n\n");
let newSystem;
if (Array.isArray(existingSystem)) {
// Preserve structured blocks — prepend injected content as a new text block
const injectedBlock = { type: "text", text: injectedText };
newSystem = [
injectedBlock,
...existingSystem,
];
}
else {
// String or undefined — concatenate as before
const existing = typeof existingSystem === "string" ? existingSystem : "";
const parts = [injectedText];
if (existing) {
parts.push(existing);
}
newSystem = parts.join("\n\n");
}
return {
...ctx,
request: {
...ctx.request,
body: {
...ctx.request.body,
system: newSystem,
},
},
};
},
};
}
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