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Implement hot/warm/cold context tiers with ContextTier, ActorRole, TieredFragment, TierBudget, ActorContextView, TierMetrics, and ScopedBackendView models. ContextTierService provides store/get, promotion/demotion with cold-tier summarisation hook, LRU eviction, per-actor filtered views (strategist/executor/reviewer), and project-scoped isolation via ScopedBackendView. Settings: context_max_tokens_hot, context_max_decisions_warm, context_max_decisions_cold. DI-wired as singleton context_tier_service. Includes Behave BDD scenarios (30), Robot Framework integration tests (7), ASV benchmarks (5 suites), and docs/reference/context_tiers.md. Closes #208
110 lines
2.9 KiB
Markdown
110 lines
2.9 KiB
Markdown
# Context Tiers
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The ACMS Context Tier system manages context fragments across three storage
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tiers — **hot**, **warm**, and **cold** — with per-actor visibility, project
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scoping, and LRU eviction.
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## Overview
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| Tier | Backend | Latency | Capacity |
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|--------|-------------|---------|------------------|
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| Hot | In-memory | Low | Token-budget |
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| Warm | SQLite stub | Medium | Decision-count |
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| Cold | File stub | High | Decision-count |
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## Models
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### ContextTier
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```python
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class ContextTier(StrEnum):
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HOT = "hot"
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WARM = "warm"
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COLD = "cold"
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```
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### ActorRole
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```python
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class ActorRole(StrEnum):
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STRATEGIST = "strategist" # sees hot + warm + cold
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EXECUTOR = "executor" # sees hot + warm
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REVIEWER = "reviewer" # sees hot only
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```
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### TieredFragment
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Extends the CRP `ContextFragment` concept with tier placement and access
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tracking metadata:
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- `fragment_id` — stable unique identifier
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- `content` — rendered text content
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- `tier` — current storage tier
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- `resource_id` — originating resource
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- `project_name` — project scope for isolation
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- `token_count` — token count of content
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- `last_accessed` — timestamp for LRU eviction
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- `access_count` — access frequency counter
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- `created_at` — creation timestamp
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### TierBudget
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Controls capacity per tier:
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- `max_tokens_hot` (default: 8000)
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- `max_decisions_warm` (default: 500)
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- `max_decisions_cold` (default: 5000)
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### ActorContextView
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Per-actor filtered view configuration with role-based default tiers.
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### TierMetrics
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Hit/miss counters: `hot_hit_count`, `hot_miss_count`, `warm_hit_count`,
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`warm_miss_count`, plus population counts per tier.
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### ScopedBackendView
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Project-scoped filter that enforces resource isolation. Fragments with
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empty `project_name` are excluded by default.
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## Service
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### ContextTierService
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```python
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from cleveragents.application.services.context_tiers import ContextTierService
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svc = ContextTierService()
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svc.store(fragment)
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svc.get("fragment-id")
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svc.promote("fragment-id") # cold→warm or warm→hot
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svc.demote("fragment-id") # hot→warm or warm→cold (with summarisation)
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svc.evict_lru(ContextTier.HOT, count=5)
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svc.get_for_actor(ActorRole.STRATEGIST, project_names=["my-project"])
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svc.get_scoped_view(["my-project"])
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svc.get_metrics()
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```
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## Configuration
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Environment variables (via `Settings`):
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| Variable | Default | Description |
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|----------|---------|-------------|
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| `CLEVERAGENTS_CONTEXT_MAX_TOKENS_HOT` | 8000 | Max tokens in hot tier |
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| `CLEVERAGENTS_CONTEXT_MAX_DECISIONS_WARM` | 500 | Max fragments in warm tier |
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| `CLEVERAGENTS_CONTEXT_MAX_DECISIONS_COLD` | 5000 | Max fragments in cold tier |
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## DI Container
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The `ContextTierService` is registered as a singleton in the DI container:
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```python
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from cleveragents.application.container import get_container
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container = get_container()
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svc = container.context_tier_service()
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```
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