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fix(server): tell agents how to nest fenced code inside code blocks #1

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fix(server): tell agents how to nest fenced code inside code blocks #1

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6 changes: 6 additions & 0 deletions apps/server/src/provider/RuntimeInstructions.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,4 +17,10 @@ describe("buildRuntimeInstructions", () => {
expect(instructions).toContain("through the Cursor harness.");
expect(instructions).not.toContain("reasoning effort");
});

it("tells the agent how to nest fenced code inside a code block", () => {
expect(buildRuntimeInstructions({ harness: "Claude Code" })).toContain(
"must be fenced with a longer fence (four backticks or a ~~~ fence)",
);
});
});
2 changes: 1 addition & 1 deletion apps/server/src/provider/RuntimeInstructions.ts
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Expand Up @@ -9,7 +9,7 @@ export function buildRuntimeInstructions(runtime: {
const effort = toSingleLine(runtime.reasoningEffort ?? "");
const modelInfo = model && model !== "auto" && model !== "default" ? `, as ${model}` : "";
const effortInfo = effort ? ` with ${effort} reasoning effort` : "";
return `<runtime_info>In case you're asked: you are running in T3 Code through the ${harness} harness${modelInfo}${effortInfo}. No need to mention this otherwise. You can embed images and videos in your response using Markdown with absolute file paths.</runtime_info>`;
return `<runtime_info>In case you're asked: you are running in T3 Code through the ${harness} harness${modelInfo}${effortInfo}. No need to mention this otherwise. You can embed images and videos in your response using Markdown with absolute file paths. Responses render as CommonMark: a code block that itself contains triple backticks must be fenced with a longer fence (four backticks or a ~~~ fence), otherwise the inner closing fence ends the block early.</runtime_info>`;
}

function toSingleLine(value: string): string {
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