Two LLM security APIs for Japanese applications.
(1) jpi-guard — Prompt Injection Detection Detects and blocks prompt injection attacks before they reach your LLM. Specialized for Japanese: full-width character bypass (全角バイパス), polite-language disguise (丁寧語擬装), indirect injection, Base64 obfuscation.
(2) PII Guard — Japanese PII Detection & Masking Scans text for 10 PII categories.
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Scored across 6 tools
Most tools have distinct purposes, but there is some overlap between check_injection, sanitize_content, and validate_rag_input, which all involve injection detection and content safety. The descriptions help differentiate them, but an agent might need to carefully choose between these three for similar tasks.
All tool names follow a consistent snake_case pattern with clear verb_noun structures, such as check_injection, get_pii_guard_key, pii_scan, sanitize_content, and validate_rag_input. This uniformity makes the set predictable and easy to navigate.
With 6 tools, the server is well-scoped for its purpose of security and PII handling in Japanese applications. Each tool serves a specific function, such as detection, scanning, sanitization, and key management, without unnecessary redundancy or gaps.
The tool set covers key areas like injection detection, PII scanning, content sanitization, and API key management, with minor gaps such as lacking tools for updating or revoking keys. However, the core workflows for securing LLM inputs in Japanese contexts are well-supported.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
check_injection1 field changedInput schema / properties / api_key / descriptionPrevious value: -"Your jpi-guard API key. Get a free trial at https://jpi-guard.nexus-api-lab.workers.dev/"New value: +"Your jpi-guard API key. If you don't have one, call get_trial_key first to get a free key instantly."pii_scan1 field changedInput schema / properties / api_key / descriptionPrevious value: -"Your PII Guard API key (format: pii_<32hex>). Get a free key with get_pii_guard_key or at https://www.nexus-api-lab.com/pii-guard.html"New value: +"Your PII Guard API key (format: pii_<32hex>). If you don't have one, call get_pii_guard_key first to get a free key instantly."sanitize_content1 field changedInput schema / properties / api_key / descriptionPrevious value: -"Your nexus-api-lab API key (Bearer token). Get a free trial key at https://www.nexus-api-lab.com"New value: +"Your nexus-api-lab API key (Bearer token). If you don't have one, call get_trial_key first to get a free key instantly."validate_rag_input1 field changedInput schema / properties / api_key / descriptionPrevious value: -"Your jpi-guard API key. Get a free trial at https://jpi-guard.nexus-api-lab.workers.dev/"New value: +"Your jpi-guard API key. If you don't have one, call get_trial_key first to get a free key instantly."check_injectionget_pii_guard_keyget_trial_keypii_scansanitize_contentvalidate_rag_input
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