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AgentSentinel MCP Gateway

sentinel_safe_fetch

Fetch public HTTP/HTTPS URLs while blocking SSRF attacks on cloud metadata IPs and private subnets, and redact sensitive data from request and response payloads.

Instructions

Perform HTTP/HTTPS network requests with SSRF protection against cloud metadata IPs (169.254.169.254) and private subnets, plus DLP payload redaction.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesTarget public URL to fetch
bodyNoOptional request body string
methodNoHTTP method (default: "GET")
headersNoOptional HTTP request headers
timeoutMsNoRequest timeout in milliseconds (default: 10000)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.3/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden and does disclose meaningful behavior: SSRF blocking of cloud metadata IPs and private subnets, plus DLP payload redaction. However, it omits what happens on a blocked request (error vs. sanitized response), whether redaction mutates the body or the response, redirect handling, and any rate limits or auth requirements. Partial but valuable disclosure.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence that leads with the core verb and resource, then appends the two differentiators. Every clause earns its place; there is no filler or repetition.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 5-parameter tool with a nested headers object and no output schema, the description covers purpose and security posture but says nothing about the return value, error/block semantics, or redirect/retry behavior. Given the absence of both annotations and an output schema, more behavioral context would be expected.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents url, body, method (with enum), headers, and timeoutMs, establishing a baseline of 3. The description adds no parameter-level detail (e.g., interaction between method, body, and content-type headers) beyond what the schema provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource ('Perform HTTP/HTTPS network requests') and adds two distinctive behavioral guarantees (SSRF protection, DLP redaction). An agent can tell this is the network-egress tool among sentinel_safe_exec, sentinel_safe_fs, sentinel_policy_check, and sentinel_audit_inspect, though it never explicitly names or contrasts those siblings.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No when-to-use guidance, no when-not-to-use, and no named alternative. The agent is left to infer that this is the tool for outbound HTTP calls versus the exec/fs siblings. Some minimal implied usage exists from the name, but nothing actionable is stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.