Faculties - Noēsis

Noēsis separates faculties (capabilities/subsystems in the runtime) from phases (observable events emitted into the episode trace).

Faculties describe what kind of cognition runs: Intuition, Direction, Governance, Insight (other runtime faculties like Memory can participate too).
Phases describe what gets recorded: observe → intuition → interpret → plan → direction → governance → act → reflect → learn → terminate → insight → memory

Faculties exist even when they emit nothing; a faculty can be active and still produce no events for a given episode.

Most users configure faculties via noesis.set() and noesis.run(), then observe results in artifacts (events.jsonl, summary.json). Python imports are only needed for writing custom policies—see Advanced: Writing policies.

Cognitive loop hook order

The runtime emits phases in a canonical order:

observe → intuition → interpret → plan → direction → governance → act → reflect → learn → terminate → insight → memory

Hook ordering is enforced by validate_hook_sequence(). Any violation raises an error.

Veto semantics (canonical)

A veto is a fail-closed stop before action execution:

Governance emits the veto decision event; runtime outcome depends on configuration:
default (governance_pause_on_veto=false): a terminate event with status="vetoed" is emitted.
pause mode (governance_pause_on_veto=true): run.interrupt and run.checkpoint are emitted instead of terminate/finalization.
No act events are emitted on veto paths.
Failure policy decides how governance exceptions resolve (e.g., enforce-veto).
veto_count is computed from governance decisions where decision="veto" (not from terminate status) to avoid double-counting.

Overview

Faculty	Role	Phase(s)	Artifact keys
Intuition	Policy guidance	intuition	`phase="intuition"` events
Direction	Plan mutations	direction	`phase="direction"` events
Governance	Pre-act audit	governance	`phase="governance"` events
Insight	Metrics computation	insight	`summary.json` metrics

Intuition

Intuition provides policy-driven guidance during the interpret phase. It observes episode state and emits events that can hint, intervene, or veto.

Configuration

import noesis as ns

# Configure via noesis.set()
ns.set(intuition_mode="advisory")  # advisory | interventive | hybrid

# Or pass a policy directly
ns.run(task="...", intuition=my_policy)

IntuitionEvent (artifact schema)

Intuition events appear in events.jsonl with phase="intuition":

{
  "phase": "intuition",
  "payload": {
    "kind": "intervention",
    "advice": "Added safety bounds",
    "confidence": 0.8,
    "policy_id": "SafetyPolicy",
    "policy_version": "1.0.0",
    "policy_kind": "rules",
    "rationale": "Unbounded query detected",
    "patch": {"limit": 100},
    "evidence_ids": ["event:observe:1"],
    "risk_level": "moderate",
    "salience_signals": ["policy_hint"],
    "strategy_hints": ["verify_first"],
    "tool_constraints": ["require_double_check"],
    "scrutiny_level": "elevated",
    "target": "input",
    "scope": "episode",
    "blocking": false
  }
}

Field	Description
`kind`	`hint` \| `intervention` \| `veto`
`confidence`	0.0 – 1.0
`patch`	State modifications (for interventions)
`blocking`	`true` for vetoes
`risk_level`	Optional risk posture: `low` \| `moderate` \| `high` \| `critical`
`salience_signals`	Optional cues for Direction: `task_complexity`, `normalization_gap`, `policy_hint`, `safety_boundary`
`strategy_hints`	Optional planning hints: `conservative`, `verify_first`, `retrieve_more`, `narrow_scope`
`tool_constraints`	Optional tool constraints: `no_side_effects`, `read_only`, `require_double_check`
`scrutiny_level`	Optional review level: `normal` \| `elevated` \| `strict`

Structured steering contract (runtime handoff)

Before planning, runtime converts IntuitionEvent into a typed IntuitionAssessment via derive_intuition_assessment(). This guarantees Direction receives a canonical steering shape even when an intuition policy omits optional fields. Defaulting rules in derive_intuition_assessment():

risk_level: critical for veto/blocking, moderate for intervention, otherwise low
scrutiny_level: strict for veto/blocking, elevated for intervention, otherwise normal
salience_signals: policy_hint for hint/intervention, safety_boundary for veto/blocking
strategy_hints: conservative + verify_first for veto/blocking, verify_first for intervention
tool_constraints: no_side_effects + require_double_check for veto/blocking

The event lineage is preserved into Direction through:

payload.intuition_event_id on phase="direction" events
top-level evidence_ids on the direction event record

Intuition modes

Mode	Behavior
`advisory`	Hints only, non-blocking
`interventive`	Can modify state
`hybrid`	Context-dependent

Direction

Direction handles plan mutations through versioned directives. It runs after plan, before governance, and does not perform vetoes—fail-closed gates live in Governance.

PlannerDirective (artifact schema)

Direction events appear in events.jsonl with phase="direction":

{
  "phase": "direction",
  "payload": {
    "schema_version": "1.2.0",
    "steps": ["meta:start", "intuition:risk-review", "intuition:read-only"],
    "status": "applied",
    "reason": "heuristic-adjustment",
    "diff": [
      {
        "key": "plan.steps[1].description",
        "before": "Execute goal: Review incidents",
        "after": "Execute read-only analysis for goal: Review incidents"
      }
    ],
    "applied": true,
    "policy_id": "planner.meta",
    "policy_version": "1.0.0",
    "policy_kind": "rules",
    "directive_id": "dir-abc123...",
    "intuition_event_id": "evt_2222...",
    "risk_level": "high",
    "salience_signals": ["policy_hint"],
    "strategy_hints": ["verify_first", "retrieve_more"],
    "tool_constraints": ["read_only"],
    "scrutiny_level": "strict",
    "evidence_ids": ["event:observe:1"]
  },
  "evidence_ids": ["event:observe:1"]
}

DirectiveStatus

Status	Meaning
`applied`	Directive was applied
`skipped`	Directive was skipped
`blocked`	Directive rejected/failed (does not stop execution)

DirectiveKind

Kind	Meaning
`hint`	Advisory, no state change
`intervention`	Modifies plan/input

Deterministic IDs

Directive IDs are computed from content for reproducible lineage.

How Direction consumes intuition

In meta mode, MetaPlanner.propose(..., intuition=IntuitionAssessment) applies explicit mutations:

high/critical risk_level appends risk review language to the first step
retrieve_more appends supporting-evidence retrieval on the first step
narrow_scope, read_only, no_side_effects constrain the second step description
elevated/strict scrutiny_level and verify_first tighten the verify step description

Direction does not enforce vetoes; enforcement happens in Governance.

Governance

Governance is the pre-action audit layer that evaluates proposed actions before execution. It operates in the governance phase.

Governed side effects (pre-act gating)

ns.governed_act(...) is the operating-system boundary for side effects. It uses the same canonical episode runtime boundary as ns.run(...) / ns.solve(...).

allow/audit: action_candidate → governance → act
enforce veto (governance_pause_on_veto=False): action_candidate → governance → terminate (no act)
enforce veto with pause enabled (governance_pause_on_veto=True): action_candidate → governance → run.interrupt → run.checkpoint (no act, no terminate)

Internal runtime seam constraint: graph execution (using=...) and explicit actuation bindings are mutually exclusive and fail fast if mixed.

import noesis as ns
from noesis.exceptions import NoesisVeto

def run_shell(*, command: str, cwd: str | None = None, timeout_ms: int | None = None):
    return {"stdout": "ok", "stderr": "", "exit_code": 0, "command": command}

ns.set(shell_executor=run_shell)

try:
    result = ns.governed_act(
        goal="List repository files",
        kind="shell",
        payload={
            "command": "ls -a",
            "cwd": ".",
            "timeout_ms": 2000,
        },
    )
    print(result)
except NoesisVeto as veto:
    # Raised only when governance is enforcing and the action is vetoed.
    print(f"Blocked by governance: {veto.advice}")

Configuration

import noesis as ns

# Configure via noesis.set()
ns.set(governance_mode="enforce")  # off | audit | enforce
ns.set(governance_failure_policy="fail_closed")  # fail_open | fail_closed

# Or supply a custom governor
ns.run(task="...", governance_policy=my_governor)

GovernanceResult (artifact schema)

Governance events appear in events.jsonl with phase="governance":

{
  "phase": "governance",
  "payload": {
    "decision": "veto",
    "rule_id": "rules.veto.protected",
    "score": 1.0,
    "message": "Task blocked by governance policy",
    "policy_id": "governance.rules",
    "policy_version": "1.0.0",
    "policy_kind": "rules",
    "mode": "enforce",
    "enforced": true
  }
}

Event stream convention: governance events keep phase="governance"; sub-hooks (e.g., pre_act) are carried inside the payload. This keeps the phase enum stable.

GovernanceDecision

Decision	Effect
`allow`	Action proceeds normally
`audit`	Action proceeds, flagged for review
`veto`	Action blocked entirely

Terminate on veto (default)

When a veto is issued and governance_pause_on_veto is disabled, the runtime emits a terminate event:

{"phase":"terminate","payload":{"status":"vetoed","message":"Blocked by governance"}}

With governance_pause_on_veto=true, runtime emits interrupt/checkpoint events instead:

{"phase":"runtime","event_type":"run.interrupt"}
{"phase":"runtime","event_type":"run.checkpoint"}

See events.v1 for canonical payload shapes.

Pause on veto (optional)

When governance_pause_on_veto=true, enforce-mode vetoes emit lifecycle events and keep the run unsealed:

{"phase":"runtime","event_type":"run.interrupt","payload":{"kind":"run.interrupt","status":"interrupted"}}
{"phase":"runtime","event_type":"run.checkpoint","payload":{"kind":"run.checkpoint","checkpoint_id":"chk_..."}}

On this paused path there is no act, no terminate, and no final.json / manifest.json yet.

Built-in rules

Rule ID	Trigger	Decision
`rules.veto.danger`	”danger” in goal/steps	`VETO`
`rules.veto.protected`	”veto”, “destroy”, “shutdown”, “wipe”	`VETO`
`rules.audit.sensitive`	”write”, “delete”, “drop”	`AUDIT`
`rules.allow.default`	No matches	`ALLOW`

Insight

Insight computes metrics from episode traces during the insight emission.

InsightMetrics (artifact schema)

Metrics appear in summary.json:

{
  "metrics": {
    "phase_ms": {"observe": 5, "interpret": 12, "plan": 150, "act": 2000, "reflect": 10},
    "veto_count": 0,
    "branching_factor": 2.0,
    "plan_adherence": 0.95,
    "success": true,
    "plan_revisions": 1,
    "tool_coverage": 3.0
  }
}

InsightMetrics fields

Field	Type	Description
`phase_ms`	`dict[str, int]`	Duration per phase in milliseconds (optional)
`veto_count`	`int`	Number of governance vetoes issued (canonical fail-closed)
`branching_factor`	`float`	Count of direction events
`plan_adherence`	`float`	Executed steps / planned steps (0-1)
`success`	`bool`	Whether episode succeeded (boolean for artifacts)
`plan_revisions`	`int`	Number of applied directives
`tool_coverage`	`float`	Number of unique tools used

Computed roll-ups

When computing analytics from events, the insight faculty produces these roll-ups:

Metric	Shape	Notes
`success`	`bool`	From artifact
`success_score`	`int` (0/1)	Numeric roll-up
`plan_count`	`int`	Non-synthetic `plan` events
`act_count`	`int`	Non-synthetic `act` events
`direction_applied`	`int`	Directives with `applied=true`
`direction_blocked`	`int`	Directives with `status="blocked"` (not a veto)
`veto_count`	`int`	Governance veto decisions

Faculty boundaries

Each faculty has clear responsibilities:

Intuition observes and advises—it should never execute actions directly.

Direction handles plan mutations—it should never evaluate outcomes.

Governance audits pre-action—it should never modify plans.

Insight computes metrics—it should never modify state or plans.

Advanced: Writing policies

This section is for users writing custom intuition policies or custom governors. Most users can skip this.

DirectedIntuition

To write a custom policy, extend DirectedIntuition:

from noesis.direction import DirectedIntuition
from noesis.intuition import IntuitionEvent

class SafetyPolicy(DirectedIntuition):
    """Custom policy with hint, intervene, and veto methods."""
    
    def advise(self, state: dict) -> IntuitionEvent | None:
        task = state.get("task", "").lower()
        
        # Veto dangerous operations
        if "drop table" in task:
            return self.veto(
                advice="Blocked: destructive SQL operation",
                confidence=0.95,
                rationale="DROP TABLE requires manual approval",
            )
        
        # Intervene to add safety bounds
        if "select" in task and "limit" not in task:
            return self.intervene(
                advice="Added LIMIT 1000",
                patch={"task": f"{task} LIMIT 1000"},
                confidence=0.8,
            )
        
        return None

Then pass it to noesis.run():

import noesis as ns

ns.run(task="...", intuition=SafetyPolicy())

DirectedIntuition methods

Method	Effect	Default confidence
`hint()`	Advisory guidance, non-blocking	0.5
`intervene()`	Modifies state via `patch`	0.6
`veto()`	Blocks execution, sets `blocking=True`	0.8

Parsing artifact payloads

If you need to parse artifact payloads programmatically:

from noesis.direction import DirectiveKind, DirectiveStatus
from noesis.governance import GovernanceDecision
from noesis.insight import compute_metrics

# Parse direction event
if payload["status"] == DirectiveStatus.BLOCKED:
    print("Directive was blocked")

# Compute metrics from events
metrics = compute_metrics(summary={...}, events=[...])
print(metrics["veto_count"])

Next steps

Write policies

Implement Intuition with custom policies.

Configure governance

Control Direction and Governance behavior.

Export metrics

Use Insight metrics in dashboards.

Cognitive loop

Understanding the full execution flow.

Get started

Tutorials

How-to guides

Explanation

​Cognitive loop hook order

​Veto semantics (canonical)

​Overview

​Intuition

​Configuration

​IntuitionEvent (artifact schema)

​Structured steering contract (runtime handoff)

​Intuition modes

​Direction

​PlannerDirective (artifact schema)

​DirectiveStatus

​DirectiveKind

​Deterministic IDs

​How Direction consumes intuition

​Governance

​Governed side effects (pre-act gating)

​Configuration

​GovernanceResult (artifact schema)

​GovernanceDecision

​Terminate on veto (default)

​Pause on veto (optional)

​Built-in rules

​Insight

​InsightMetrics (artifact schema)

​InsightMetrics fields

​Computed roll-ups

​Faculty boundaries

​Advanced: Writing policies

​DirectedIntuition

​DirectedIntuition methods

​Parsing artifact payloads

​Next steps

Write policies

Configure governance

Export metrics

Cognitive loop

Cognitive loop hook order

Veto semantics (canonical)

Overview

Intuition

Configuration

IntuitionEvent (artifact schema)

Structured steering contract (runtime handoff)

Intuition modes

Direction

PlannerDirective (artifact schema)

DirectiveStatus

DirectiveKind

Deterministic IDs

How Direction consumes intuition

Governance

Governed side effects (pre-act gating)

Configuration

GovernanceResult (artifact schema)

GovernanceDecision

Terminate on veto (default)

Pause on veto (optional)

Built-in rules

Insight

InsightMetrics (artifact schema)

InsightMetrics fields

Computed roll-ups

Faculty boundaries

Advanced: Writing policies

DirectedIntuition

DirectedIntuition methods

Parsing artifact payloads

Next steps