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Events are stored in events.jsonl as newline-delimited JSON. Each event represents a phase transition in the cognitive loop.

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Event structure

Every event follows this base structure: 
{
  "id": "evt_abc123",
  "phase": "plan",
  "agent_id": "meta_planner",
  "payload": { ... },
  "metrics": {
    "started_at": "2024-01-15T10:30:00.500Z",
    "completed_at": "2024-01-15T10:30:00.512Z",
    "duration_ms": 12.7
  },
  "caused_by": "evt_xyz789"
}
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id
string
required
Unique event identifier.
​
phase
string
required
Event phase. Possible values: start, observe, interpret, plan, direction, intuition, insight, reason, governance, act, reflect, learn, terminate, error.
​
agent_id
string
Identifier of the component that emitted the event.
​
payload
object
required
Phase-specific payload data.
​
metrics
object
Timing metrics for the event.
​
caused_by
string
ID of the event that caused this one (for lineage tracking).

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Event phases

Additional phases you may see:
  • start: episode initialization metadata.
  • intuition: advisory/intuition policy events.
  • insight: computed insight metrics (alias of events —phase insight).
  • reason: reasoning traces from the planner.
  • error: fatal errors.

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observe

Captures the raw task and context at episode start. 
{
  "phase": "observe",
  "payload": {
    "task": "Draft release notes for v1.2.0",
    "tags": {
      "priority": "high",
      "team": "platform"
    },
    "timestamp": "2024-01-15T10:30:00Z",
    "context": {
      "changelog_path": "CHANGELOG.md"
    }
  }
}
​
payload.task
string
required
The task or goal for the episode.
​
payload.tags
object
User-provided metadata tags.
​
payload.timestamp
string
required
ISO 8601 timestamp of observation.
​
payload.context
object
Additional context provided with the task.

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interpret

Summarizes signals extracted from the observed input. 
{
  "phase": "interpret",
  "payload": {
    "signals": [
      {
        "type": "risk",
        "level": "medium",
        "description": "Production deployment mentioned"
      },
      {
        "type": "constraint",
        "description": "Requires changelog file"
      }
    ],
    "intent": "documentation_generation",
    "policy_id": "SafetyPolicy@1.0"
  }
}
​
payload.signals
array
required
List of detected signals.
​
payload.intent
string
Classified intent of the task.
​
payload.policy_id
string
Policy that performed interpretation.

​
plan

Records the selected action steps. 
{
  "phase": "plan",
  "payload": {
    "steps": [
      {
        "id": "step_1",
        "kind": "detect",
        "description": "Read changelog entries",
        "status": "pending"
      },
      {
        "id": "step_2",
        "kind": "act",
        "description": "Generate summary",
        "status": "pending"
      }
    ],
    "confidence": 0.85
  }
}
​
payload.steps
array
required
Ordered list of planned steps.
​
payload.confidence
number
Confidence score for the plan (0-1).

​
direction

Records policy directives (meta mode only). 
{
  "phase": "direction",
  "payload": {
    "directive_id": "dir_abc123",
    "status": "applied",
    "advice": "Added LIMIT 1000 to query",
    "target": "input",
    "diff": ["plan.steps[0].parameters.limit"],
    "policy_id": "SafetyPolicy@1.0",
    "policy_version": "1.0",
    "rationale": "Unbounded queries can exhaust resources"
  }
}
​
payload.directive_id
string
required
Unique directive identifier.
​
payload.status
string
required
Directive status: applied, blocked, skipped.
​
payload.advice
string
required
Human-readable advice from the policy.
​
payload.target
string
required
Target of the directive: input, plan, action.
​
payload.diff
array
List of paths that were modified.
​
payload.policy_id
string
required
Policy that issued the directive.
​
payload.rationale
string
Explanation for the directive.

​
governance

Records governance decisions (meta mode only). 
{
  "phase": "governance",
  "payload": {
    "governance_id": "gov_def456",
    "decision_id": "dec_789",
    "decision": "allow",
    "rule_id": "rules.allow.default",
    "score": 0.95,
    "policy_id": "governance.rules",
    "policy_version": "1.0.0",
    "policy_kind": "rules",
    "details": {
      "checked_rules": ["rule1", "rule2"],
      "matched_rule": "rule1"
    }
  }
}
​
payload.governance_id
string
required
Unique governance event identifier.
​
payload.decision
string
required
Governance decision: allow, audit, veto.
​
payload.rule_id
string
Rule that determined the decision.
​
payload.score
number
Confidence score for the decision (0-1).
​
payload.policy_id
string
required
Governance policy identifier.
​
payload.details
object
Additional governance details.

​
act

Logs tool or adapter invocations. 
{
  "phase": "act",
  "payload": {
    "tool": "changelog_reader",
    "adapter": "baseline",
    "input_excerpt": "CHANGELOG.md",
    "outcome": {
      "entries_found": 15,
      "status": "success"
    },
    "status": "success",
    "error": null
  }
}
​
payload.tool
string
Tool that was invoked.
​
payload.adapter
string
Adapter that was invoked.
​
payload.input_excerpt
string
Truncated input for logging.
​
payload.outcome
object
required
Result of the action.
​
payload.status
string
required
Action status: success, error, timeout.
​
payload.error
string
Error message if action failed.

​
reflect

Evaluates outcomes against expectations. 
{
  "phase": "reflect",
  "payload": {
    "success": true,
    "reason": "All planned steps completed successfully",
    "expected_outcomes": ["data_processed", "report_generated"],
    "actual_outcomes": ["data_processed", "report_generated"],
    "issues": [],
    "metrics": {
      "task_score": 0.95,
      "steps_completed": 3,
      "steps_total": 3
    }
  }
}
​
payload.success
boolean
required
Whether the episode succeeded.
​
payload.reason
string
required
Human-readable explanation of the outcome.
​
payload.expected_outcomes
array
List of expected outcomes.
​
payload.actual_outcomes
array
List of actual outcomes.
​
payload.issues
array
List of issues encountered.
​
payload.metrics
object
Evaluation metrics.

​
learn

Captures learning signals for future episodes. 
{
  "phase": "learn",
  "payload": {
    "updates": [
      {
        "type": "memory",
        "key": "changelog_format",
        "value": "keep-a-changelog"
      },
      {
        "type": "proposal",
        "target": "veto_threshold",
        "suggested_value": 0.8,
        "confidence": 0.75
      }
    ],
    "scope": "session"
  }
}
​
payload.updates
array
required
List of learning updates.
​
payload.scope
string
required
Update scope: session, episode, policy, global.

​
terminate

Marks the end of an episode. 
{
  "phase": "terminate",
  "payload": {
    "status": "completed",
    "episode_id": "ep_2024_abc123_s0",
    "duration_ms": 5000
  }
}
​
payload.status
string
required
Final status: completed, errored, vetoed, aborted.
​
payload.episode_id
string
required
Episode identifier.
​
payload.duration_ms
number
required
Total episode duration in milliseconds.

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Event order invariant

Events follow this order: 
observe → (interpret → plan)* → (direction → governance)? → act+ → reflect → (learn)? → terminate
  • observe is always first
  • interpret and plan may repeat
  • direction and governance only appear in meta mode
  • Multiple act events are common
  • learn is optional
  • terminate is always last

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Reading events

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CLI

# All events
noesis events ep_abc123

# Filter by phase
noesis events ep_abc123 --phase act

# As JSON
noesis events ep_abc123 -j

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Python

import noesis as ns

events = list(ns.events.read("ep_abc123"))

# Filter
act_events = [e for e in events if e["phase"] == "act"]

# Reconstruct lineage
def get_chain(events, event_id):
    chain = []
    current = next((e for e in events if e["id"] == event_id), None)
    while current:
        chain.append(current)
        caused_by = current.get("caused_by")
        current = next((e for e in events if e["id"] == caused_by), None)
    return chain

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Next steps

State schema

State artifact reference.

Cognitive loop

Understanding the phases.