pubchem-substance

Fetch chemical substance data from PubChem by SID.

SERVERMeta Data Mcp SOURCEpypi:meta-data-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-derekslinz-meta-data-mcp/pubchem-substance.md

WHAT IT DOES

What pubchem-substance does on Meta Data Mcp

AI agents call pubchem-substance to retrieve information from Meta Data Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why pubchem-substance is rated Low

This tool retrieves data from PubChem, a public chemistry database, by querying with a substance identifier (SID). It has no side effects, does not execute code, does not modify data, and does not involve financial transactions.

From the tool's definition Tool name 'pubchem-substance' and description 'Fetch chemical substance data from PubChem by SID' indicates a retrieval operation with no modification or execution capabilities. The verb 'Fetch' explicitly indicates read-only access to public chemical data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pubchem-substance safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Meta Data Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pubchem-substance, this is the rule to start with:

pubchem-substance Allowed

pubchem-substance is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pubchem-substance": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Meta Data Mcp, apply this rule, and every pubchem-substance call is checked against it from then on.

FAQ

Questions about pubchem-substance

What does the pubchem-substance tool do? +

Fetch chemical substance data from PubChem by SID. It is categorised as a Read tool in the Meta Data Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on pubchem-substance? +

Register the Meta Data MCP server in PolicyLayer and add a rule for pubchem-substance: 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 Meta Data Mcp. Nothing to install.

What risk level is pubchem-substance? +

pubchem-substance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit pubchem-substance? +

Yes. Add a rate_limit block to the pubchem-substance 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.

How do I block pubchem-substance completely? +

Set action: deny in the PolicyLayer policy for pubchem-substance. 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.

What MCP server provides pubchem-substance? +

pubchem-substance is provided by the Meta Data MCP server (pypi:meta-data-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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