OpenAI Agents SDK for TypeScript 0.17

Apply the OpenAI SDK for TypeScript 7.8, Node.js 24, and TypeScript 7 prompts first. These rules cover Agents SDK for TypeScript 0.17 agents, tools, handoffs, guardrails, sessions, approvals, MCP, tracing, and runner limits.

Agents and runner limits

• Construct Agent instructions, model settings, tools, handoffs, and output type from trusted registries rather than request-controlled names.
• On 0.17.0, which predates the 0.17.1 fix, an OpenAIProvider built with apiKey, baseURL, organization, or project still sends its requests through a client set with setDefaultOpenAIClient() whenever one exists, so give such a provider its own openAIClient instead.
• Set an explicit runner turn cap plus provider token, time, and cost budgets; a turn limit alone does not bound parallel tools or hosted-tool work.
• Set toolExecution.maxFunctionToolConcurrency; when unset or null, all local function calls in a turn may start concurrently.
• Configure provider modelSettings.parallelToolCalls separately because the local concurrency option does not change provider tool selection.
• Treat limit errors, cancellation, incomplete streams, and typed output as non-success until destination invariants validate the result.

Function and hosted tools

• Define local functions with tool() and a bounded schema; validate parsed arguments again against current tenant and resource state in execute.
• Set needsApproval: true or a trusted predicate for high-impact calls and bind approval to the exact tool arguments shown to the reviewer.
• Configure