Convert between freight and logistics units. Supports weight (kg, lbs, oz, tonnes, short_tons, long_tons), volume (cbm, cuft, cuin, litres, gal_us, gal_uk), length (cm, inches, m, feet, mm), and freight-specific conversions (cbm→chargeable_kg, cbm→freight_tonnes). Use this tool when you need to...
Part of the FreightUtils MCP Server MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call unit_converter to retrieve information from FreightUtils MCP Server 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 unit_converter 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:
unit_converter:
rules:
- action: allowSee the full FreightUtils MCP Server policy for all 11 tools.
Agents calling read-class tools like unit_converter 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.
Convert between freight and logistics units. Supports weight (kg, lbs, oz, tonnes, short_tons, long_tons), volume (cbm, cuft, cuin, litres, gal_us, gal_uk), length (cm, inches, m, feet, mm), and freight-specific conversions (cbm→chargeable_kg, cbm→freight_tonnes). Use this tool when you need to: - Convert between metric and imperial units - Calculate freight tonnes from CBM (1 CBM = 1 freight tonne = 1,000 kg) - Convert CBM to chargeable weight for air freight quoting Note: Short tons (US) = 2,000 lbs. Long tons (UK) = 2,240 lbs. Metric tonnes = 2,204.6 lbs.. It is categorised as a Read tool in the FreightUtils MCP Server MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for unit_converter. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the FreightUtils MCP Server MCP server.
unit_converter 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 unit_converter 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 unit_converter. 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.
unit_converter is provided by the FreightUtils MCP Server MCP server (freightutils-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