Validate that a DEVELOPMENT_PLAN.md is Haiku-executable (can be implemented by Claude Haiku without interpretation). Returns specific errors with fix instructions. IMPORTANT: After calling devplan_generate_plan, you MUST enhance the scaffold with complete code, then call this tool to validate bef...
Part of the DevPlan MCP Server server.
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AI agents call devplan_validate_haiku_executable to retrieve information from DevPlan 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 devplan_validate_haiku_executable 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.
{
"version": "1",
"default": "deny",
"tools": {
"devplan_validate_haiku_executable": {}
}
}See the full DevPlan MCP Server policy for all 25 tools.
These attack patterns abuse exactly the kind of access devplan_validate_haiku_executable gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Validate that a DEVELOPMENT_PLAN.md is Haiku-executable (can be implemented by Claude Haiku without interpretation). Returns specific errors with fix instructions. IMPORTANT: After calling devplan_generate_plan, you MUST enhance the scaffold with complete code, then call this tool to validate before presenting to the user.. It is categorised as a Read tool in the DevPlan MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DevPlan MCP Server MCP server in PolicyLayer and add a rule for devplan_validate_haiku_executable: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches DevPlan MCP Server. Nothing to install.
devplan_validate_haiku_executable 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 devplan_validate_haiku_executable rule in your PolicyLayer 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 PolicyLayer policy for devplan_validate_haiku_executable. 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.
devplan_validate_haiku_executable is provided by the DevPlan MCP Server MCP server (https://devplan-mcp-server.mike-c63.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 DevPlan MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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