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Drop the prompt cache breakpoint on the Slack agent system prompt #12

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Merged
sergical merged 1 commit into from
Oct 2, 2026
Merged

Drop the prompt cache breakpoint on the Slack agent system prompt #12

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7 changes: 0 additions & 7 deletions apps/slack-agent/src/agent.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24,12 +24,6 @@ function resolveModel(): string {
: "anthropic/claude-sonnet-5";
}

// The breakpoint caches the tool definitions plus the system prompt; without
// it Anthropic caches nothing.
const PROMPT_CACHE_OPTIONS = {
openrouter: { cacheControl: { type: "ephemeral" } },
};

const TODAY = new Date().toISOString().slice(0, 10);

// Anthropic only caches prompt prefixes of at least 1024 tokens (Sonnet 5),
Expand Down Expand Up @@ -67,7 +61,6 @@ export function streamAnswer({
instructions: {
role: "system",
content: SYSTEM_PROMPT,
providerOptions: PROMPT_CACHE_OPTIONS,
},
messages,
abortSignal,
Expand Down
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