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Security audit

API Tester

Security checks for vulnerabilities and agentic risk

Overview

This is a simple API testing guide that describes user-directed HTTP requests and does not include hidden code, persistence, or credential handling.

Before installing, understand that using this skill for real API tests may send headers, request bodies, GraphQL queries, and validation data to the endpoints you choose. Do not include tokens, internal URLs, or sensitive payloads unless you intend to test with them. Also note that the referenced helper script is not packaged here, so the skill may be incomplete without additional tooling.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (6)

Missing User Warnings

Medium
Confidence
95% confidence
Finding
The skill explicitly supports sending HTTP requests, GraphQL queries, monitoring checks, and request bodies to user-specified endpoints, but it does not warn users that supplied data will be transmitted to external services. This can lead to accidental disclosure of sensitive prompts, tokens, internal URLs, or test payloads when the skill is invoked in real environments.

External Transmission

Medium
Category
Data Exfiltration
Content
```bash
python3 scripts/api_test.py \
  --method GET \
  --url "https://api.example.com/users" \
  --expect-status 200
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
```bash
python3 scripts/api_test.py \
  --method GET \
  --url "https://api.example.com/users" \
  --expect-status 200
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
```bash
python3 scripts/api_test.py \
  --method GET \
  --url "https://api.example.com/users" \
  --expect-status 200
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
```bash
python3 scripts/api_test.py \
  --method GET \
  --url "https://api.example.com/users" \
  --expect-status 200
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
```bash
python3 scripts/api_test.py \
  --method GET \
  --url "https://api.example.com/users" \
  --expect-status 200
```
Confidence
50% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Static analysis

No suspicious patterns detected.