How We Made Grantex Enterprise-Grade: 3,332 Tests, Zero Failures

TL;DR: We ran a comprehensive security, resilience, and API quality audit on Grantex — the open authorization protocol for AI agents. We found and fixed 20+ issues across security (timing attacks, missing rate limits, open CORS), resilience (no DB transactions, no connection pools, no retry logic), and API consistency (phantom types, inconsistent error codes). The result: 3,332 tests across 27 packages with a 100% pass rate.

---

What is Grantex?

Grantex is OAuth 2.0 for AI agents. When an AI agent calls Salesforce, Jira, or Stripe on behalf of a human, Grantex ensures the agent can only do what it was authorized to do — read contacts, not delete them.

• 3 SDKs: TypeScript, Python, Go
• 53 pre-built tool manifests for scope enforcement
• Integrations: LangChain, Anthropic, OpenAI Agents, CrewAI, Google ADK, Vercel AI, MCP
• W3C Verifiable Credentials, FIDO2/WebAuthn, DID infrastructure
• Apache 2.0, IETF Internet-Draft

The Audit

We ran 5 parallel deep-dive audits:

1. Security Audit

Found:

• Admin authentication using !== (timing-attack vulnerable)
• Zero rate limits on signup, session creation, SAML callbacks
• CORS wide open (default Fastify config)
• SSO state parameter was plain base64 (forgeable)
• JWT exp claim not validated in grant introspection
• No scope format validation (could send 10MB scope strings)

Fixed:

• crypto.timingSafeEqual() for admin auth
• Rate limits on every POST/PATCH/DELETE endpoint
• CORS locked to origin: false
• SSO state HMAC-signed with timing-safe verification
• JWT expiry validated
• Scope validation: max 256 chars, max 100 scopes
• 7 HTTP security headers (HSTS, X-Content-Type-Options, X-Frame-Options, etc.)
• 1MB body size limit
• Input trimming on all string fields

2. Resilience Audit

Found:

• No database connection pool settings
• Token exchange: 4 sequential DB writes without transaction
• Redis errors silently swallowed
• No graceful shutdown (workers leaked on SIGTERM)
• Health check just returned 200 (didn't check DB or Redis)
• No SDK retry logic in any language

Fixed:

• Connection pools (max 20, idle 30s, connect 10s, lifetime 30min)
• Token exchange wrapped in sql.begin() transaction
• Redis error handlers with reconnection logging
• Graceful shutdown: SIGTERM → stop workers → close Redis → close DB
• Deep health check: SELECT 1 + PING with 2s timeout, 503 on degraded
• Config validation on startup (exits on missing DATABASE_URL, REDIS_URL, etc.)
• SDK retry with exponential backoff + jitter in TypeScript, Python, and Go
• Webhook retry jitter (20% randomization to prevent thundering herd)

3. API Consistency Audit

Found:

• SDK types defined pagination fields (total, page, pageSize) that the API never returned
• Admin error responses missing code and requestId
• HTTP 422 used for parse errors (should be 400)
• Inconsistent error formats across routes

Fixed:

• SDK types aligned with actual API responses
• All error responses standardized: { message, code, requestId }
• 422 reserved for semantic validation only

4. Observability

Found:

• console.log and console.error everywhere
• No structured logging
• No log levels

Fixed:

• Structured pino JSON logging (zero console.* remaining)
• LOG_LEVEL env var with dev-mode pino-pretty
• Worker child loggers with context bindings

5. Documentation Gaps

Found:

• 29 API endpoints implemented but undocumented
• SDK overview tables missing 6-9 resource clients
• 4 SDK docs pages missing (Python/Go vault + passports)
• No Security Hardening guide
• No Operations guide

Fixed:

• 35 new API reference pages
• All overview tables complete (20/20 services)
• Security Hardening + Operations guides
• SDK retry configuration documented
• CHANGELOG updated

The Numbers

Metric	Before	After
Security issues	12	0
Endpoints with rate limits	~5	All
SDK retry logic	None	All 3 languages
Health check depth	Shallow (200 always)	DB + Redis (503 on degraded)
Structured logging	None	Full pino
Test count	~2,800	3,332
Pass rate	~99%	100%
Packages tested	~20	27

Try It

npm install @grantex/sdk    # TypeScript
pip install grantex          # Python
go get github.com/mishrasanjeev/grantex-go  # Go

• GitHub: https://github.com/mishrasanjeev/grantex
• Docs: https://docs.grantex.dev
• Discord: https://discord.gg/QuSk7AeBdg
• Security guide: https://docs.grantex.dev/guides/security-hardening
• Operations guide: https://docs.grantex.dev/guides/operations

Star the repo if you're building AI agents that need real authorization.

---

Grantex is Apache 2.0 licensed. IETF Internet-Draft submitted. SOC 2 Type I certified.