ISO 639 language lookup. Pass code in any form — 639-1 (en), 639-2/B (ger), 639-2/T (deu) — or name. Returns the English name + all sibling codes (alpha-2, alpha3-B, alpha3-T), resolving the bibliographic/terminological split (German = de/deu/ger). Bundled authoritative ISO 639 data.
AI agents call iso.language to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward reference data lookup tool. It queries a static ISO 639 database and returns language codes and names. There are no side effects, no code execution, no data modification, and no financial impact. The tool has minimal blast radius even if misused by an agent—worst case it returns incorrect language information, which is harmless.
From the tool's definition Tool description states it 'lookup[s]' and 'Returns' ISO 639 language data. No mention of modification, deletion, execution, or financial operations. Pure data retrieval from bundled reference data.
Attacks that exploit this kind of access
ISO 639 language lookup. Pass code in any form — 639-1 (en), 639-2/B (ger), 639-2/T (deu) — or name. Returns the English name + all sibling codes (alpha-2, alpha3-B, alpha3-T), resolving the bibliographic/terminological split (German = de/deu/ger). Bundled authoritative ISO 639 data. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for iso.language: 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 Mcp. Nothing to install.
iso.language 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 iso.language 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 iso.language. 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.
iso.language is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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