Part 2 · The Harness Around the Model

Recap (Part A) · Prompt Engineering + Agent

Context overflow strategies / Prompt six elements / tool calling truth / Skill + scaffolding

THE QUESTION THIS PAGE ANSWERS

ANSWER FIRST

What is the key idea behind “Recap (Part A) · Prompt Engineering + Agent”?

Context overflow strategies / Prompt six elements / tool calling truth / Skill + scaffolding

DECISION RULE

Make the claim earn its place. Use this page as a decision aid, not a definition to memorize. Connect the idea to one real task, one observable result, and one failure that would change your mind.

TRY NEXT

Write one question you could answer with evidence after trying this idea.

WATCH FOR

A conclusion that sounds complete but leaves the key assumption untested.

Part 1 · Context & Prompt
📐
I. Context & Prompt Engineering
Core skills for designing the Message List
Three Context Overflow Strategies
Limited workspace — manage it deliberately
Truncation Simple, but early messages are permanently lost — best for short-turn tools
Summarization Balanced choice — requires an extra LLM call, suited for long-running conversations
Semantic Retrieval Most precise — requires a vector system, optimal Token usage
6 Prompt Elements + 4 Advanced Techniques
Write Prompts like code
6 Elements: Role + Task + Context + Constraints + Examples + Format

4 Advanced Techniques: Few-Shot (learn format from examples), Chain of Thought (step-by-step reasoning), Constraints (word count / tone / banned words), Task Decomposition (break into steps)
Output Format Selection Principles
Choose format based on context
Streaming to user side → XML / plain text (incrementally parseable)
Backend consumption → YAML / JSON (YAML saves 15–30% Tokens)
Document / rich-text display → Markdown (render-friendly)
Part 2 · Agent Engineering
🤖
II. Agent Engineering
Taking AI from "saying" to "doing"
Four Core Agent Capabilities
🧭 Plan
Break complex tasks into executable steps
🔧 Tool Use
Call search, code execution, database, and APIs
🗃️ Memory
Short-term context + long-term vector database
🔄 Act / Reflect
Observe after acting — self-correct on failure
The Truth About Tool Calls
The model just outputs formatted text
1
System Prompt pre-defines the tool list, telling the model what tools are available
2
The model predicts a JSON string (not an actual call)
3
Framework code parses the JSON → makes the real API call → injects results back into context
Skill + Scaffolding
Making Agent reliable
Skill = process instructions + tool-call guidance, keeping the ReAct loop as short and efficient as possible

Scaffolding = timeout/retry + max-step limit + input/output validation + state machine + observability (logging).
An Agent without scaffolding is not reliable in production.
Chapter 2 Summary · Part 1 · Next: Cost Optimization + AI PM Comprehensive Understanding

Why “Part 1 · Context & Prompt” can find relevant content

“Context overflow strategies / Prompt six elements / tool calling truth / Skill + scaffolding” moves retrieval beyond storing material: the real question is how to find what is relevant. That decision shapes the input quality of RAG, recommendation, and image-search systems.

Similarity is not the answer

In the flow described by “Context overflow strategies / Prompt six elements / tool calling truth / Skill + scaffolding”, embeddings place items in a comparable semantic space and a neighbor index narrows the search. The final answer still depends on whether the retrieved chunks cover the question, whether the distance metric fits, and whether the evidence is current.

Separate findable from relevant

Turn “Context overflow strategies / Prompt six elements / tool calling truth / Skill + scaffolding” into a small test: prepare queries with known answers, record relevance, misses, and distractors, then decide whether chunking, the index, or reranking needs to change.

From “Part 1 · Context & Prompt” to “Part 2 · Agent Engineering”

“Part 1 · Context & Prompt” grounds the problem in “📐 I. Context & Prompt Engineering Core skills for designing the Message List Three Context Overflow Strategies Limited workspace — manage it deliberately Truncation Simple, but early messages are permanently l…”. “Part 2 · Agent Engineering” then moves it toward “🤖 II. Agent Engineering Taking AI from "saying" to "doing" Four Core Agent Capabilities 🧭 Plan Break complex tasks into executable steps 🔧 Tool Use Call search, code execution, database, and APIs 🗃️ Memory…”. Together, they show that the lesson is not just a conclusion to remember, but a claim with conditions.

Carry the judgment into the next situation

The same logic applies to retrieval: define what counts as relevant, check whether recall covers the question, and then inspect whether ranking, chunking, or freshness pushed useful evidence out.

  • “Part 1 · Context & Prompt”: 📐 I. Context & Prompt Engineering Core skills for designing the Message List Three Context Overflow Strategies Limited workspace — manage it deliberately Truncation Simple, but early messages are permanently l…
  • “Part 2 · Agent Engineering”: 🤖 II. Agent Engineering Taking AI from "saying" to "doing" Four Core Agent Capabilities 🧭 Plan Break complex tasks into executable steps 🔧 Tool Use Call search, code execution, database, and APIs 🗃️ Memory…

The final “Finish by testing the claim” brings the discussion to “Context overflow strategies / Prompt six elements / tool calling truth / Skill + scaffolding”. The useful thing to carry forward is knowing which judgments must be revisited when input, scale, or risk changes.

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Discussing Recap (Part A) · Prompt Engineering + Agent The Harness Around the Model
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AM
Asha MorganContent editor
INSIGHTField note

I turned one judgment from this article into a small experiment I could run today. Knowing what to observe next is more useful than simply remembering the conclusion.

ARTICLE DISCUSSION7 helpful
LH
Lin HarperIndie developer
INSIGHTInsight

After reading this, I first looked for the conditions behind the idea instead of copying the method into a project. That order made the later trade-offs much clearer.

ARTICLE DISCUSSION5 helpful
KM
Kiki MooreProduct operations
QUESTIONQuestion

When this judgment reaches real work, which constraint should be added first? I am curious which step matters most between reading and the first practical attempt.

ARTICLE DISCUSSION4 helpful