}

return "runtime constraints";

}

const MODEL_IDENTITY_PREFIX = "Current model identity:";

export function buildModelIdentityPromptLine(model?: string): string | undefined {

const trimmed = model?.trim();

if (!trimmed) {

return undefined;

}

return `${MODEL_IDENTITY_PREFIX} ${trimmed}. If asked what model you are, answer with this value for the current run.`;

}

export function appendModelIdentitySystemPrompt(params: {

systemPrompt: string;

model?: string;

}): string {

const line = buildModelIdentityPromptLine(params.model);

if (!line) {

return params.systemPrompt;

}

let replaced = false;

const nextLines = params.systemPrompt

.split(/\r?\n/u)

.filter((candidate) => {

if (!candidate.trimStart().startsWith(MODEL_IDENTITY_PREFIX)) {

return true;

}

if (replaced) {

return false;

}

replaced = true;

return true;

})

.map((candidate) =>

candidate.trimStart().startsWith(MODEL_IDENTITY_PREFIX) ? line : candidate,

);

if (replaced) {

return nextLines.join("\n");

}

const base = params.systemPrompt.trimEnd();

return base ? `${base}\n\n${line}` : line;

}

export function buildAgentSystemPrompt(params: {

workspaceDir: string;

defaultThinkLevel?: ThinkLevel;

const skillsPrompt = params.skillsPrompt?.trim();

const heartbeatPrompt = params.heartbeatPrompt?.trim();

const runtimeInfo = params.runtimeInfo;

const modelIdentityLine = buildModelIdentityPromptLine(runtimeInfo?.model);

const runtimeChannel = normalizeOptionalLowercaseString(runtimeInfo?.channel);

const runtimeCapabilities = runtimeInfo?.capabilities ?? [];

const runtimeCapabilitiesLower = new Set(

// For "none" mode, return just the basic identity line

if (promptMode === "none") {

return "You are a personal assistant running inside OpenClaw.";

return ["You are a personal assistant running inside OpenClaw.", modelIdentityLine]

.filter(Boolean)

.join("\n");

}

const contextFiles = params.contextFiles ?? [];

lines.push(

"## Runtime",

buildRuntimeLine(runtimeInfo, runtimeChannel, runtimeCapabilities, params.defaultThinkLevel),

...(modelIdentityLine ? [modelIdentityLine] : []),

`Reasoning: ${reasoningLevel} (hidden unless on/stream). Toggle /reasoning; /status shows Reasoning when enabled.`,

);