Fetch a single paper by PMID. Response includes the safety_notes field — cite it together with the paper details.
Part of the 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) server.
Free to start. No card required.
AI agents call get_paper to retrieve information from 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) 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 get_paper 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": {
"get_paper": {}
}
}See the full 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) policy for all 6 tools.
These attack patterns abuse exactly the kind of access get_paper 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.
Fetch a single paper by PMID. Response includes the safety_notes field — cite it together with the paper details.. It is categorised as a Read tool in the 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) MCP Server, which means it retrieves data without modifying state.
Register the 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) MCP server in PolicyLayer and add a rule for get_paper: 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 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers). Nothing to install.
get_paper 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 get_paper 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 get_paper. 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.
get_paper is provided by the 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) MCP server (@h2-papers/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 水素分子医学文献データベース — Molecular hydrogen medical literature (H2 Papers) tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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