# [dev_260101_06] Level 5 Component Selection Decisions

**Date:** 2026-01-01
**Type:** Development
**Status:** Resolved
**Related Dev:** dev_260101_05

## Problem Description

Applied Level 5 Component Selection parameters from AI Agent System Design Framework to select LLM model, tool suite, memory architecture, and guardrails for GAIA benchmark agent MVP.

---

## Key Decisions

**Parameter 1: LLM Model → Claude Sonnet 4.5 (primary) + Free API baseline options**
- **Primary choice:** Claude Sonnet 4.5
  - **Reasoning:** Framework best practice - "Start with most capable model to baseline performance, then optimize downward for cost"
  - **Capability match:** Sonnet 4.5 provides strong reasoning + tool use capabilities required for GAIA
  - **Budget alignment:** Learning project allows premium model for baseline measurement
- **Free API baseline alternatives:**
  - **Google Gemini 2.0 Flash** (via AI Studio free tier)
    - Function calling support, multi-modal, good reasoning
    - Free quota: 1500 requests/day, suitable for GAIA evaluation
  - **Qwen 2.5 72B** (via HuggingFace Inference API)
    - Open source, function calling via HF API
    - Free tier available, strong reasoning performance
  - **Meta Llama 3.3 70B** (via HuggingFace Inference API)
    - Open source, good tool use capability
    - Free tier for experimentation
- **Optimization path:** Start with free baseline (Gemini Flash), compare with Claude if budget allows
- **Implication:** Dual-track approach - free API for experimentation, premium model for performance ceiling

**Parameter 2: Tool Suite → Web browser / Python interpreter / File reader / Multi-modal processor**
- **Evidence-based selection:** GAIA requirements breakdown:
  - Web browsing: 76% of questions
  - Code execution: 33% of questions
  - File reading: 28% of questions (diverse formats)
  - Multi-modal (vision): 30% of questions
- **Specific tools:**
  - Web search: Exa or Tavily API
  - Code execution: Python interpreter (sandboxed)
  - File reader: Multi-format parser (PDF, CSV, Excel, images)
  - Vision: Multi-modal LLM capability for image analysis
- **Coverage:** 4 core tools address primary GAIA capability requirements for MVP

**Parameter 3: Memory Architecture → Short-term context only**
- **Reasoning:** GAIA questions are independent and stateless (Level 1 decision)
- **Evidence:** Zero-shot evaluation requires each question answered in isolation
- **Implication:** No vector stores/RAG/semantic memory/episodic memory needed
- **Memory scope:** Only maintain context within single question execution
- **Alignment:** Matches Level 1 stateless design, prevents cross-question contamination

**Parameter 4: Guardrails → Output validation + Tool restrictions**
- **Output validation:** Enforce factoid answer format (numbers/few words/comma-separated lists)
- **Tool restrictions:** Execution timeouts (prevent infinite loops), resource limits
- **Minimal constraints:** No heavy content filtering for MVP (learning context)
- **Safety focus:** Format compliance and execution safety, not content policy enforcement

**Parameter 5: Answer Synthesis → LLM-generated (Stage 3 implementation)**
- **Reasoning:** GAIA requires extracting factoid answers from multi-source evidence
- **Evidence:** Answers must synthesize information from web searches, code outputs, file contents
- **Implication:** LLM must reason about evidence and generate final answer (not template-based)
- **Stage alignment:** Core logic implementation in Stage 3 (beyond MVP tool integration)
- **Capability requirement:** LLM must distill complex evidence into concise factoid format

**Parameter 6: Conflict Resolution → LLM-based reasoning (Stage 3 implementation)**
- **Reasoning:** Multi-source evidence may contain conflicting information requiring judgment
- **Example scenarios:** Conflicting search results, outdated vs current information, contradictory sources
- **Implication:** LLM must evaluate source credibility and recency to resolve conflicts
- **Stage alignment:** Decision logic in Stage 3 (not needed for Stage 2 tool integration)
- **Alternative rejected:** Latest wins / Source priority too simplistic for GAIA evidence evaluation

**Rejected alternatives:**

- Vector stores/RAG: Unnecessary for stateless question-answering
- Semantic/episodic memory: Violates GAIA zero-shot evaluation requirements
- Heavy prompt constraints: Over-engineering for learning/benchmark context
- Procedural caches: No repeated procedures to cache in stateless design

**Future optimization:**

- Model selection: A/B test free baselines (Gemini Flash, Qwen, Llama) vs premium (Claude, GPT-4)
- Tool expansion: Add specialized tools based on failure analysis
- Memory: Consider episodic memory for self-improvement experiments (non-benchmark mode)

## Outcome

Selected component stack optimized for GAIA MVP: Claude Sonnet 4.5 for reasoning, 4 core tools (web/code/file/vision) for capability coverage, short-term context for stateless execution, minimal guardrails for format validation and safety.

**Deliverables:**
- `dev/dev_260101_06_level5_component_selection.md` - Level 5 component selection decisions

**Component Specifications:**

- **LLM:** Claude Sonnet 4.5 (primary) with free baseline alternatives (Gemini 2.0 Flash, Qwen 2.5 72B, Llama 3.3 70B)
- **Tools:** Web (Exa/Tavily) + Python interpreter + File reader + Vision
- **Memory:** Short-term context only (stateless)
- **Guardrails:** Output format validation + execution timeouts

## Learnings and Insights

**Pattern discovered:** Component selection driven by evidence-based requirements (GAIA capability analysis: 76% web, 33% code, 28% file, 30% multi-modal) rather than speculative "might need this" additions.

**Best practice application:** "Start with most capable model to baseline performance" prevents premature optimization. Measure first, optimize second.

**Memory architecture principle:** Stateless design enforced by benchmark requirements creates clean separation - no cross-question context leakage.

**Critical connection:** Tool suite selection directly impacts Level 6 framework choice (framework must support function calling for tool integration).

## Changelog

**What was changed:**
- Created `dev/dev_260101_06_level5_component_selection.md` - Level 5 component selection decisions
- Referenced AI Agent System Design Framework (2026-01-01).pdf Level 5 parameters
- Referenced GAIA_TuyenPham_Analysis.pdf capability requirements (76% web, 33% code, 28% file, 30% multi-modal)
- Established Claude Sonnet 4.5 as primary LLM with free baseline alternatives (Gemini 2.0 Flash, Qwen 2.5 72B, Llama 3.3 70B)
- Added dual-track optimization path: free API for experimentation, premium model for performance ceiling