Agent Skills: Context Engine - AI Agent Context Management

Context Engine - AI Agent Context Management

Context Engine provides production-grade patterns for managing what AI agents know, remember, and retrieve. It covers the full lifecycle: ingestion of project knowledge, optimal packing of context windows, persistent memory across sessions, and retrieval-augmented generation for large codebases. The difference between a useful agent and a hallucinating one is context management.

Core Capabilities

• Context window architecture — token budget allocation plus greedy, tiered, and adaptive-compression packing strategies.
• Memory architecture — three-layer model (working / session / knowledge base), promotion protocol, and staleness detection.
• Code retrieval — file-level, chunk-level (RAG), and dependency-aware retrieval with code chunking and embedding guidance.
• Knowledge graph construction — codebase graph schema (nodes + edges) and graph queries that resolve agent questions.
• Window optimization patterns — sliding window with anchors, progressive summarization, selective tool-result caching.
• Memory tool & context editing — file-backed persistent memory across sessions, plus context compaction (evict stale tool outputs, summarize-and-replace history) to keep a long loop from exhausting the window.
• Long-context strategies — when to use a 1M-token window vs. RAG vs. a hybrid agent loop, budget allocation across a big window, and position/attention effects.
• Multi-agent context sharing — shared context bus and a five-element handoff protocol.

When to Use

• Bootstrapping agent context for a new codebase (index → graph → summary → tiers).
• Optimizing context for a specific task (bug fix, feature, refactor, review).
• Capturing, promoting, and pruning session memory across sessions.
• Designing a RAG pipeline for code retrieval.
• Coordinating context across multiple collaborating agents.

Clarify First

Before designing or analyzing, confirm these inputs. If any is unknown or vague, ASK — do not assume:

• [ ] Which task — bootstrap context for a codebase, optimize for a specific task, design persistent memory, or build a code RAG (selects the analyzer/pruner/indexer and the playbook)
• [ ] Token budget — the context-window ceiling (sets --budget and which packing strategy applies)
• [ ] Source content — the files/codebase or knowledge base to index (the input the scripts process)

Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.

Tools

| Tool | Purpose | Command | |------|---------|---------| | context_analyzer.py | Analyze files/prompts for token usage, relevance, and optimization suggestions | python scripts/context_analyzer.py src/ --budget 128000 --json | | context_pruner.py | Prune low-relevance content, redundancy, and verbose patterns from context | python scripts/context_pruner.py src/main.py --aggressive --json | | memory_indexer.py | Index and search a memory/knowledge base with TF-IDF relevance scoring | python scripts/memory_indexer.py docs/ --query 'auth middleware' --top 5 | | context_budget_planner.py | Allocate a window across components, flag overflow, and suggest what to compact/evict first | python scripts/context_budget_planner.py --window-size 200000 --system 4000 --history 60000 --tools 90000 --rag 40000 --reserve-output 8000 |

References

Load the reference that matches the task — keep this file lean and pull detail on demand:

• references/context-window-strategies.md — budget allocation, packing strategies, and window-optimization patterns. Read when planning budgets or optimizing a long conversation.
• references/memory-architecture-guide.md — three-layer memory model, promotion protocol, staleness detection, shared context bus + handoff protocol. Read when designing persistent memory or coordinating agents.
• references/code-retrieval-patterns.md — file/chunk/dependency-aware retrieval, chunking/embedding guidance, knowledge-graph schema and queries. Read when building RAG for code.
• references/memory-and-context-editing.md — the memory-tool pattern (file-backed memory, what to store vs. recompute, retention, security) and context editing/compaction (eviction priority, summarize-and-replace, token-savings payoff) and how both weave into the agent loop. Read when persisting state across sessions or keeping a long loop from exhausting the window.
• references/long-context-strategies.md — long-context vs. RAG vs. hybrid decision-making, budget allocation across a 1M-token window, position/attention effects, and when a bigger window hurts (cost, latency, distraction). Read when choosing a window-vs-retrieval strategy.
• references/workflows-and-quality.md — the three workflows, anti-patterns, evaluation metrics, troubleshooting, and success criteria. Read before running a workflow and before shipping.

Scope & Limitations

This skill covers:

• Context window token budget planning, allocation strategies, and packing algorithms for AI coding agents.
• Multi-layer memory architecture design (working memory, session memory, knowledge base) with promotion and staleness protocols.
• Code-specific retrieval strategies including file-level, chunk-level, and dependency-aware retrieval for RAG pipelines.
• Knowledge graph construction from codebases and graph-based context queries for agent workflows.

This skill does NOT cover:

• Vector store infrastructure setup, embedding model selection, or database deployment — see rag-architect for vector store design and embedding strategies.
• Agent role definition, personality design, or multi-agent orchestration logic — see agent-designer for agent architecture and agent-workflow-designer for orchestration patterns.
• Runtime observability, metrics dashboards, or alerting for agent systems — see observability-designer for monitoring and instrumentation.
• Prompt engineering techniques, chain-of-thought design, or instruction tuning — see prompt-engineer-toolkit for prompt construction patterns.

Integration Points

| Skill | Integration | Data Flow | |-------|-------------|-----------| | rag-architect | Context Engine defines retrieval strategies; RAG Architect implements the vector store and embedding pipeline | Retrieval queries flow from Context Engine to RAG Architect's indexed store; ranked results flow back as context chunks | | agent-designer | Agent Designer defines agent roles and capabilities; Context Engine manages per-agent context budgets and memory layers | Agent specifications define context requirements; Context Engine returns tailored context windows per agent role | | self-improving-agent | Self-Improving Agent identifies recurring patterns and corrections; Context Engine decides when to promote learnings to persistent memory | Candidate learnings flow from Self-Improving Agent; promotion decisions and memory updates flow back through Context Engine's staleness and promotion protocols | | observability-designer | Observability Designer instruments context utilization metrics (relevance, staleness, cache hits); Context Engine exposes metric endpoints | Raw metric events flow from Context Engine; Observability Designer aggregates into dashboards and alerts | | agent-workflow-designer | Agent Workflow Designer defines multi-agent handoff sequences; Context Engine implements the shared context bus and handoff protocol | Workflow definitions specify which agents share context; Context Engine manages the context bus, serialization, and handoff payloads | | codebase-onboarding | Codebase Onboarding generates project summaries and architecture maps; Context Engine consumes these as Tier 0 bootstrap context | Onboarding artifacts (project summary, directory map, entry points) feed into Context Engine's initial knowledge graph and context tiers |