Book an unlocked flight — creates real airline reservation with PNR. FREE after unlock. FLOW: search_flights → unlock_flight_offer (quote) → book_flight Requirements: 1) Offer must be unlocked first 2) passenger_ids from search 3) Full passenger details SAFETY: Always provide idempotency_key to...
High parameter count (12 properties)
Part of the BoostedTravel MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call book_flight to retrieve information from BoostedTravel without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though book_flight only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
book_flight:
rules:
- action: allowSee the full BoostedTravel policy for all 8 tools.
Agents calling read-class tools like book_flight have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Book an unlocked flight — creates real airline reservation with PNR. FREE after unlock. FLOW: search_flights → unlock_flight_offer (quote) → book_flight Requirements: 1) Offer must be unlocked first 2) passenger_ids from search 3) Full passenger details SAFETY: Always provide idempotency_key to prevent double-bookings if this call is retried. Use any unique string (e.g., UUID). If the same key is sent twice, returns the original booking. ERROR HANDLING: Errors include error_code and error_category fields. transient (SUPPLIER_TIMEOUT, RATE_LIMITED) → safe to retry after short delay validation (INVALID_IATA, INVALID_DATE) → fix input, then retry business (OFFER_EXPIRED, PAYMENT_DECLINED) → requires human decision. It is categorised as a Read tool in the BoostedTravel MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for book_flight. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the BoostedTravel MCP server.
book_flight is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the book_flight rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the Intercept policy for book_flight. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
book_flight is provided by the BoostedTravel MCP server (boostedtravel-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept