Validate a mixed batch of medical codes against their source terminologies. Useful for retrospective analysis of legacy databases — flag codes that no longer exist, surface ICD-10 → ICD-11 replacements, and grade activity status where the terminology exposes it. For each input { code, terminology...
Risk signalsAccepts freeform code/query input (codes[].code)
Part of the Medical Terminologies MCP server.
Free to start. No card required.
AI agents call validate_codes to retrieve information from Medical Terminologies MCP 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 validate_codes 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": {
"validate_codes": {}
}
}See the full Medical Terminologies MCP policy for all 31 tools.
These attack patterns abuse exactly the kind of access validate_codes 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 a mixed batch of medical codes against their source terminologies. Useful for retrospective analysis of legacy databases — flag codes that no longer exist, surface ICD-10 → ICD-11 replacements, and grade activity status where the terminology exposes it. For each input { code, terminology }, returns: - valid: whether the code exists in the source terminology. - active: whether the code is currently active. Null when the source doesn't expose an explicit active/inactive distinction at category level (CID-10, ATC, ICD-11, RxNorm, MeSH all return null today; SNOMED and LOINC return a real boolean). - title: the official label/name when available. - replaced_by: a successor code, populated today only for ICD-10 codes that have a primary ICD-11 mapping in the bundled WHO transition tables. - source: human-readable provenance of the validation (terminology + release/version). - error: non-null only when validation couldn't be performed (network error, SNOMED feature flag off, etc.). valid: false + error: null means "code not found"; valid: false + error: set means "couldn't validate". Terminology is required per code — auto-detection isn't supported because category codes like "A00" exist in both ICD-10 and CID-10. Accepted values: icd11, icd10, snomed, loinc, rxnorm, mesh, atc, cid10. Hard cap of 50 codes per call; codes are validated in parallel through their respective clients, so total wall time scales with the slowest upstream + its rate limit (worst case ~10 s for a full batch hitting ICD-11).. It is categorised as a Read tool in the Medical Terminologies MCP MCP Server, which means it retrieves data without modifying state.
Register the Medical Terminologies MCP server in PolicyLayer and add a rule for validate_codes: 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 Medical Terminologies MCP. Nothing to install.
validate_codes 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 validate_codes 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 validate_codes. 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.
validate_codes is provided by the Medical Terminologies MCP server (sidneybissoli/medical-terminologies). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 31 Medical Terminologies MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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