openai-responses-tool-file-security

Prevent unauthorized file access in OpenAI Responses API integrations by enforcing per-request authorization checks and strict file-search scope validation. This ensures hosted tools only access permitted resources, eliminating data leakage risks from out-of-scope file retrieval.

Per-request tool exposure secures hosted tools by restricting endpoint availability to the specific user and request context. This mechanism ensures custom functions and file search tools are only accessible when explicitly authorized, preventing privilege escalation and unsafe tool chaining.

Validate function call arguments to prevent prompt injection in the Responses API by applying strict schema validation to all tool inputs and outputs. This ensures conversation-state data and custom function parameters conform to expected formats, actively blocking malicious injection attempts.

Implement a tool loop circuit breaker for OpenAI Responses API by validating previous_response_id and monitoring conversation-state escalation. This containment strategy stops runaway tool chaining loops, preventing unsafe recursive function calls and mitigating excessive automated resource consumption.

The OpenAI Responses API can support per-user isolation for file search tools when paired with strict per-request authorization checks. Validating attached resource scopes and enforcing endpoint tool exposure ensures users only retrieve their own explicitly permitted files.

Relying on OpenAI hosted tools without strict schema validation allows misconfigurations that leak data and escalate tool privileges. Without per-endpoint tool exposure and argument validation, custom functions become vulnerable to prompt injection and unsafe conversation-state chaining.