Function req

packages/e2e-tests/src/cache-analysis.test.ts:18–39

(messages: Array<{ role: string; content: unknown; bp?: boolean }>)

const MC_SYSTEM = "## Magic Context\nyou are a long-term partner.";

function req(messages: Array<{ role: string; content: unknown; bp?: boolean }>) {
    return {
        body: {
            system: MC_SYSTEM,
            messages: messages.map((m) => ({
                role: m.role,
                // Real OpenCode wire keeps a message's content shape stable across
                // turns; only the cache_control marker moves. Render every message
                // in the identical block-array form so a message looks the same
                // whether it sits in the tail (with breakpoint) or the prefix
                // (breakpoint moved on). The oracle strips cache_control before
                // hashing, so the only difference between tail and prefix is the
                // (stripped) marker — never the content shape.
                content: m.bp
                    ? [{ type: "text", text: String(m.content), cache_control: { type: "ephemeral" } }]
                    : Array.isArray(m.content)
                      ? m.content
                      : [{ type: "text", text: String(m.content) }],
            })),
        },
    };
}

/** A user turn whose final message carries the moving cache_control breakpoint. */
function turn(prefix: Array<{ role: string; content: string }>, tail: string) {