To extend rather than replace a section, read its current default from the exported SYSTEM_PROMPT_SECTIONS map and override with a derived string, e.g. append a rule, prepend a note, or hand the default to a coding agent to rewrite under some criteria:
composeSystemPrompt({
// Keep the default behaviour, add one extra line.
responseFormatting: `${SYSTEM_PROMPT_SECTIONS.responseFormatting}\n- Always answer in Spanish.`,
});
Per-section body overrides. Each key replaces that section's body, and omitted sections fall back to SYSTEM_PROMPT_SECTIONS. composeSystemPrompt and
MapAgentOptions.systemPromptaccept them.