Improving Reliability in Autonomous Agent Systems

# Illustrative sketch (not from the paper)
import collections

# Simple representation of a delegation declaration
class Delegation:
    def __init__(self, name, deps=None):
        self.name = name
        self.deps = deps or []  # list of dependent delegation names
        self.state = "pending"

# Compile declarations into a DAG (dependency graph)
def build_dag(decls):
    dag = collections.defaultdict(list)
    for d in decls:
        for dep in d.deps:
            dag[dep].append(d.name)
    return dag

# Lifecycle stages (stubs)
def test_design(d): d.state = "test_design"
def preflight(d): d.state = "preflight"
def red_validation(d): d.state = "red_validation"
def implementation(d): d.state = "implementation"
def local_verification(d): d.state = "local_verification"
def oracle_qualification(d): d.state = "oracle_qualification"
def cross_service_acceptance(d): d.state = "accepted"

# Agent Mesh sidecar primitives (stubs)
def progress_breaker(d): pass  # would abort on stalled progress
def effect_contract(d): pass   # declare allowed side‑effects
def effect_ledger(d): pass      # record canonicalized tool calls (specified but not built)
def budget_lattice(d): pass    # enforce resource budgets
def failure_routing(d): pass   # redirect failing delegations
def exoneration_layer(d): pass # allow trusted enforcement to skip checks
def nondeterminism_quarantine(d): pass # isolate nondeterministic outcomes

# Verify effect‑level correctness (stub comparison)
def verify_effects(d, observed):
    # Compare observed effect fingerprint against declaration‑level contract
    return observed == d.name  # placeholder logic

# Example driver
if __name__ == "__main__":
    # Define a few delegations with dependencies
    a = Delegation("A")
    b = Delegation("B", deps=["A"])
    c = Delegation("C", deps=["A", "B"])
    decls = [a, b, c]

    dag = build_dag(decls)
    for d in decls:
        test_design(d)
        preflight(d)
        red_validation(d)
        implementation(d)
        local_verification(d)
        oracle_qualification(d)
        cross_service_acceptance(d)
        # Apply reliability primitives
        progress_breaker(d)
        effect_contract(d)
        effect_ledger(d)
        budget_lattice(d)
        failure_routing(d)
        exoneration_layer(d)
        nondeterminism_quarantine(d)
        # Verify effects (observed placeholder)
        assert verify_effects(d, observed=d.name)

// Illustrative sketch (not from the paper)
const EventEmitter = require('events');

// Simple delegation declaration
class Delegation extends EventEmitter {
  constructor(name, deps = []) {
    super();
    this.name = name;
    this.deps = deps; // array of dependent delegation names
    this.state = 'pending';
  }
}

// Compile declarations into a dependency DAG (adjacency list)
function buildDag(decls) {
  const dag = {};
  decls.forEach(d => {
    d.deps.forEach(dep => {
      if (!dag[dep]) dag[dep] = [];
      dag[dep].push(d.name);
    });
  });
  return dag;
}

// Lifecycle stage stubs
function testDesign(d) { d.state = 'test_design'; }
function preflight(d) { d.state = 'preflight'; }
function redValidation(d) { d.state = 'red_validation'; }
function implementation(d) { d.state = 'implementation'; }
function localVerification(d) { d.state = 'local_verification'; }
function oracleQualification(d) { d.state = 'oracle_qualification'; }
function crossServiceAcceptance(d) { d.state = 'accepted'; }

// Agent Mesh sidecar primitives (stubs)
function progressBreaker(d) { /* abort on stalled progress */ }
function effectContract(d) { /* declare allowed side‑effects */ }
function effectLedger(d) { /* record tool‑call fingerprint (specified but not built) */ }
function budgetLattice(d) { /* enforce resource budgets */ }
function failureRouting(d) { /* redirect failing delegations */ }
function exonerationLayer(d) { /* allow trusted enforcement to skip checks */ }
function nondeterminismQuarantine(d) { /* isolate nondeterministic outcomes */ }

// Verify effect‑level correctness (stub comparison)
function verifyEffects(d, observed) {
  // Compare observed effect fingerprint against declaration contract
  return observed === d.name; // placeholder logic
}

// Example driver
(function main() {
  const a = new Delegation('A');
  const b = new Delegation('B', ['A']);
  const c = new Delegation('C', ['A', 'B']);
  const decls = [a, b, c];

  const dag = buildDag(decls);
  decls.forEach(d => {
    testDesign(d);
    preflight(d);
    redValidation(d);
    implementation(d);
    localVerification(d);
    oracleQualification(d);
    crossServiceAcceptance(d);
    // Apply reliability primitives
    progressBreaker(d);
    effectContract(d);
    effectLedger(d);
    budgetLattice(d);
    failureRouting(d);
    exonerationLayer(d);
    nondeterminismQuarantine(d);
    // Verify effects (observed placeholder)
    if (!verifyEffects(d, d.name)) throw new Error('Effect verification failed');
  });
})();