Recon Skills is a pack of security-testing skills covering reconnaissance, web applications, APIs, authentication, vulnerability validation, cloud infrastructure, and reporting. Security professionals use it for authorized assessments of systems they own or have written permission to test. The catalogue entries are individual skills from the pack.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add uphiago/recon-skills --skill hunt-nestjsgit clone --depth 1 https://github.com/uphiago/recon-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/uphiago/recon-skills/hunt-nestjs)<a href="https://agentmods.dev/skills/uphiago/recon-skills/hunt-nestjs"><img src="https://agentmods.dev/badge/skills/uphiago/recon-skills/hunt-nestjs/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/uphiago/recon-skills/hunt-nestjs"><img src="https://agentmods.dev/badge/skills/uphiago/recon-skills/hunt-nestjs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 76 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
- medium Tool Misuse · line 48 Tool defaults are unsafe or overly permissive (e.g. disabled TLS verification, no authentication, world-writable permissions). Unsafe defaults widen the attack surface.Fix: Override unsafe defaults with secure settings (verify=True, auth required, restrictive permissions). Review and harden all tool configurations.
- medium Tool Misuse · line 155 Tool defaults are unsafe or overly permissive (e.g. disabled TLS verification, no authentication, world-writable permissions). Unsafe defaults widen the attack surface.Fix: Override unsafe defaults with secure settings (verify=True, auth required, restrictive permissions). Review and harden all tool configurations.
- medium Data Exfiltration · line 53 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00024 | $0.01888 |
| Opus 5 | $0.00012 | $0.00944 |
| Sonnet 5 | $0.00005 | $0.00378 |
| Haiku 4.5 | $0.00002 | $0.00189 |
Grade A, and why
hunt-nestjs scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
compatibility: Requires curl, python3 How it starts
The opening of the file, as written. The whole thing — 172 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NestJS Security Hunting
Hunt NestJS-specific vulnerabilities in guard bypass via decorator stack gaps, Reflector metadata mismatches between global/controller/method guards, ValidationPipe whitelist and transform exploits, and microservice transport authentication drift. NestJS's architectural patterns — decorators, dependency injection, module system, multi-transport support — create unique attack surface across HTTP, WebSocket, and RPC transports.
When to Use
- Target uses NestJS (indicated by
x-powered-by: NestJSor TypeScript decorator patterns in error messages). - GraphQL endpoints exist alongside REST API.
- Microservice transports (TCP, Redis, NATS, MQTT, gRPC) are configured.
- Swagger/OpenAPI docs are exposed at
/apior/api-json. - CRUD endpoints follow predictable NestJS naming conventions.
Quick Detection
# NestJS fingerprinting
curl --max-time 30 --connect-timeout 10 -skI "https://target.com/api" | grep -iE "x-powered-by|server"
# Look for: x-powered-by: NestJS
# Swagger docs
curl --max-time 30 --connect-timeout 10 -sk "https://target.com/api" -w "%{http_code}\n" -o /dev/null
curl --max-time 30 --connect-timeout 10 -sk "https://target.com/api-json" | jq '.paths | keys[]' 2>/dev/null
Procedure
Phase 1 — Guard Bypass via Decorator Stack Gaps
# NestJS guard resolution: global → controller → method
# A @Public() or @SkipAuth() on one method doesn't affect others
# BUT: route parameter confusion can bypass guards
# Test all HTTP methods on guarded endpoints
for method in GET POST PUT PATCH DELETE OPTIONS; do
curl --max-time 30 --connect-timeout 10 -sk -X "$method" "https://target.com/api/admin/users" \
-w "$method — %{http_code}\n" -o /dev/null
done
# Controller-level guard with method-level override
curl --max-time 30 --connect-timeout 10 -sk "https://target.com/api/admin/health" # may be @Public
curl --max-time 30 --connect-timeout 10 -sk "https://target.com/api/admin/config" # may be @Public
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 172 lines · 24 tokens per session scan A 990762264971
hunt-nestjs is a skill published in the GitHub repository uphiago/recon-skills (1,254 stars, last pushed 11d ago), licensed MIT. It adds 24 tokens to every session and 1,888 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
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conducting-api-security-testing
Conducts security testing of REST, GraphQL, and gRPC APIs to identify vulnerabilities in authentication, authorization, rate limiting, input validation, and business logic. The tester uses the OWASP API Security Top 10 as the testing framework, combining Burp Suite interception with Postman collections and custom…
nestjs-expert
Expert knowledge in NestJS framework, modular architecture, dependency injection, TypeORM/Prisma persistence, microservices transports, and enterprise-grade Node.js backend development. Use when the user mentions NestJS, Nest CLI, decorators, dependency injection, guards, interceptors, or backend microservices, or…
graphql-batching-attacks
Exploit GraphQL API architectural features to execute highly efficient brute-force, Credential Stuffing, and Denial of Service (DoS) attacks. Utilize Query Batching and Alias injection to bypass rate limits by packing thousands of requests into a single HTTP POST request.
performing-graphql-introspection-attack
Performs GraphQL introspection attacks to extract the full API schema including types, queries, mutations, subscriptions, and field definitions from GraphQL endpoints. The tester uses introspection queries to map the attack surface, identifies sensitive fields and mutations, tests for query depth and complexity…
detecting-api-enumeration-attacks
Detect and prevent API enumeration attacks including BOLA and IDOR exploitation by monitoring sequential identifier access patterns and authorization failures.