Calculate Gibraltar Payments on Account. Splits the annual corporate tax liability into two equal payments due 28 February and 30 September. Provide either lastYearTax or lastYearProfit with optional taxRate.
Part of the Company Gibraltar MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use poa_calculator to create or modify resources in Company Gibraltar. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call poa_calculator repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Company Gibraltar.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
poa_calculator:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Company Gibraltar policy for all 6 tools.
Agents calling write-class tools like poa_calculator have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
Calculate Gibraltar Payments on Account. Splits the annual corporate tax liability into two equal payments due 28 February and 30 September. Provide either lastYearTax or lastYearProfit with optional taxRate.. It is categorised as a Write tool in the Company Gibraltar MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Add a rule in your Intercept YAML policy under the tools section for poa_calculator. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Company Gibraltar MCP server.
poa_calculator is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the poa_calculator 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 poa_calculator. 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.
poa_calculator is provided by the Company Gibraltar MCP server (company-gibraltar-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