Atlas Librarian · Memory Lifecycle
Memory can stay retained without staying equally hot.
Atlas Librarian uses a five-state thermal model—Hot, Warm, Cool, Cold and Frozen—to describe the operational heat of retained memory. Thermal state works alongside freshness, use, update and promotion evidence so Atlas can keep important current context close while preserving older knowledge for explicit recall instead of deleting it simply because it is no longer active.
Five thermal states
Temperature expresses cognitive heat, not whether a record still exists.
The thermal model helps separate retention from immediacy. A Frozen record can still matter for an audit, incident trace or historical question. A Hot record can demand immediate attention even if it was created only moments ago.
Memory with high immediate relevance or strong guardrail value. Examples can include active Working Memory, current handover state, current rules and time-sensitive scheduler context.
Durable knowledge that remains readily useful but does not need to dominate every reasoning cycle. Stable facts, procedures, decisions, routes and schemas commonly begin in this range.
Context that remains meaningful but is naturally more historical or relational, such as event history, episodic records and relationship material.
Retained material that has moved further from the active working set. It remains discoverable when the task explicitly reaches back for deeper context.
Long-tail retained knowledge intended to stay out of routine active recall while remaining available for explicit historical, date-based or trace-based retrieval.
Freshness is multi-dimensional
A single timestamp cannot explain whether memory is still useful.
Atlas tracks several classes of lifecycle evidence. Publicly, the important idea is that memory age, memory use and memory promotion are different signals. A record may be old but frequently relied upon; another may be new but already superseded.
When the memory entered the durable system establishes provenance and chronological context, but age alone does not define relevance.
When the memory was most recently retrieved as a candidate provides evidence that it was considered for active context.
When the memory actually participated in reasoning is tracked separately from retrieval, preserving the difference between visibility and influence.
A changed fact or procedure may regain relevance because its content was revised even if the original record lineage is older.
Promotion records when transient or working material was deliberately elevated into durable memory.
Usage and freshness can provide additional ranking context without implying that popularity automatically makes a memory authoritative.
Thermal defaults by cognitive role
Different memory segments naturally enter the system with different heat expectations.
The canonical segment registry gives each segment a default thermal posture. That makes lifecycle behaviour part of the memory architecture rather than an afterthought applied to every record identically.
Conscious Memory Index, Working Memory, Scheduler, Handover and Rules Memory are designed to stay close to active cognition because they influence current selection, continuity, time-aware follow-up or guardrails.
Semantic, Procedural, Decision, Routes, Schema, Entity and Personalization Memory are durable working knowledge that should remain accessible without all being active simultaneously.
Episodic, Relationship and Event Memory are naturally contextual or historical. They can become important quickly, but routine reasoning does not require the full event history every time.
Archive Memory is intentionally low-heat. Its value is reliable retention and explicit retrievability, not automatic presence in everyday reasoning.
Hot state versus durable truth
Fast active cognition and durable project memory are separate lanes.
Atlas maintains a short-lived hot working-state lane for current thread, current situation and current project context while the durable memory layer remains the canonical retained source. This separation lets active state change quickly without turning transient context into permanent history by accident.
Optimized for current context, temporary coordination and quick access. It is allowed to expire or be replaced as the active situation changes.
Retains classified project knowledge with provenance, lifecycle, scope, authority and freshness information suitable for longer-term continuity.
Material moves from transient context toward durable retention through deliberate promotion criteria rather than assuming every temporary observation deserves permanent memory.
Expired hot state can be cleaned from the active lane after promotable knowledge is retained, keeping speed and durability as separate concerns.
Why thermal memory matters
Long-term intelligence needs a way to forget operationally without erasing historically.
For a persistent project, deletion is often the wrong response to declining relevance. Thermal memory provides a middle ground: reduce a record's active heat, preserve the record's trace, and let explicit recall bring it back when the task warrants historical depth.
Routine reasoning stays focused because older low-heat records do not need to compete with current rules, handovers and active work.
Incidents and prior decisions remain available when the question explicitly asks what happened, what changed or why a previous path was abandoned.
Superseded material can be retained for traceability while lifecycle state prevents it from masquerading as the current answer.
The longer a project runs, the more important it becomes to control cognitive heat instead of relying on a binary keep/delete model.
Thermal cognition