Session Security Configuration: TTL, Renewals, and Absolute Lifetime for AI Agents

2026-04-20

Session security configuration is the foundation of safe AI agent wallet operations, determining when credentials expire and how often they can be renewed. Without proper session boundaries, an AI agent could maintain indefinite access to your funds, creating serious security risks.

Why Session Control Matters

AI agents operate autonomously, making transactions without human oversight. Unlike traditional applications where users actively log in and out, AI agents run continuously—sometimes for days or weeks. This creates a fundamental security challenge: how do you grant sufficient access for the agent to function while maintaining strict boundaries to prevent catastrophic losses?

Session timeouts, renewal limits, and absolute lifetimes act as automatic circuit breakers. Even if an agent's logic fails, its credentials, or your security policies are compromised, these time-based controls ensure that access eventually expires.

WAIaaS Session Security Architecture

WAIaaS implements a three-layer session security model that balances agent functionality with strict access control:

Layer 1: Session Token Expiration (TTL)

Every AI agent session has a Time-To-Live (TTL) that determines when the session token expires. The agent must actively renew before expiration or lose access:

// Create session with 1-hour TTL
curl -X POST http://127.0.0.1:3100/v1/sessions \
  -H "Content-Type: application/json" \
  -H "X-Master-Password: my-secret-password" \
  -d '{
    "walletId": "<wallet-uuid>",
    "ttl": 3600,
    "name": "trading-agent"
  }'

Short TTLs (15-60 minutes) force frequent renewal checks, creating opportunities to detect and halt misbehaving agents. Long TTLs (24+ hours) reduce renewal overhead but increase risk exposure.

Layer 2: Maximum Renewals

Even valid sessions can't renew indefinitely. The maxRenewals parameter limits how many times a session can extend its lifetime:

# Session can renew maximum 10 times (11 total TTL periods)
curl -X POST http://127.0.0.1:3100/v1/sessions \
  -H "Content-Type: application/json" \
  -H "X-Master-Password: my-secret-password" \
  -d '{
    "walletId": "<wallet-uuid>",
    "ttl": 3600,
    "maxRenewals": 10,
    "name": "limited-agent"
  }'

This prevents agents from running indefinitely, even if they're functioning normally. After 10 renewals, the session dies permanently and requires human intervention to create a new one.

Layer 3: Absolute Lifetime

The absoluteLifetime parameter sets a hard deadline for session termination, regardless of renewal attempts:

# Session dies after 7 days, no matter what
curl -X POST http://127.0.0.1:3100/v1/sessions \
  -H "Content-Type: application/json" \
  -H "X-Master-Password: my-secret-password" \
  -d '{
    "walletId": "<wallet-uuid>",
    "ttl": 1800,
    "maxRenewals": 100,
    "absoluteLifetime": 604800,
    "name": "weekly-trading-agent"
  }'

Even if the agent successfully renews every 30 minutes for a week, the session terminates after exactly 7 days. This provides a guaranteed upper bound on agent access duration.

Practical Session Configuration Patterns

Pattern 1: Short-Lived Task Agent

For agents performing specific, time-bounded tasks:

curl -X POST http://127.0.0.1:3100/v1/sessions \
  -H "Content-Type: application/json" \
  -H "X-Master-Password: my-secret-password" \
  -d '{
    "walletId": "<wallet-uuid>",
    "ttl": 900,
    "maxRenewals": 8,
    "absoluteLifetime": 7200,
    "name": "arbitrage-task"
  }'

Pattern 2: Daily Trading Agent

For agents that should operate during trading hours but stop overnight:

curl -X POST http://127.0.0.1:3100/v1/sessions \
  -H "Content-Type: application/json" \
  -H "X-Master-Password: my-secret-password" \
  -d '{
    "walletId": "<wallet-uuid>",
    "ttl": 3600,
    "maxRenewals": 12,
    "absoluteLifetime": 43200,
    "name": "daily-trader"
  }'

Pattern 3: Long-Running with Checkpoints

For agents that need extended operation but with periodic human verification:

curl -X POST http://127.0.0.1:3100/v1/sessions \
  -H "Content-Type: application/json" \
  -H "X-Master-Password: my-secret-password" \
  -d '{
    "walletId": "<wallet-uuid>",
    "ttl": 21600,
    "maxRenewals": 7,
    "absoluteLifetime": 604800,
    "name": "weekly-dca-agent"
  }'

Session Monitoring and Health Checks

Active session monitoring helps detect issues before they become problems:

# Check all active sessions
curl http://127.0.0.1:3100/v1/sessions \
  -H "X-Master-Password: my-secret-password"

Key monitoring metrics:

WAIaaS automatically logs session events:

Emergency Session Termination

Even with careful configuration, you need kill switches for emergency situations:

# Terminate specific session immediately
curl -X DELETE http://127.0.0.1:3100/v1/sessions/<session-id> \
  -H "X-Master-Password: my-secret-password"

# Terminate ALL sessions for a wallet
curl -X DELETE http://127.0.0.1:3100/v1/sessions \
  -H "X-Master-Password: my-secret-password" \
  -d '{"walletId": "<wallet-uuid>"}'

This immediately invalidates session tokens, stopping agent access within seconds.

Integration with Policy Engine

Session security works alongside WAIaaS's 21 policy types and 4 security tiers. Even active sessions face additional constraints:

Session controls handle the "when" of agent access, while policies handle the "what" and "how much."

Quick Start: Secure Session Setup

  1. Install WAIaaS CLI:

    npm install -g @waiaas/cli
waiaas init
waiaas start

  2. Create wallet with restrictive policies:

    waiaas wallet create --chain solana --network mainnet

  3. Create time-limited session:

    waiaas session create --wallet-id <id> --ttl 1800 --max-renewals 4 --absolute-lifetime 7200

  4. Monitor session health:

    waiaas session status

  5. Configure emergency shutdown:

    waiaas session terminate --all  # Kill switch

Session security configuration isn't just about preventing unauthorized access—it's about creating predictable boundaries for autonomous systems. By combining TTL, renewal limits, and absolute lifetimes, you ensure that AI agents operate within safe, well-defined time windows while maintaining the flexibility needed for effective automation.

For more advanced security configurations, see Policy Engine Configuration: 21 Types, 4 Tiers, Default-Deny and Human-in-the-Loop Transaction Approval via WalletConnect.

What's Next

Ready to implement secure session management for your AI agents? Check out the complete documentation and examples at GitHub or explore the full security architecture at waiaas.ai.