Exam Weight 18% 21 Articles · 5 Tasks

Tool Design & MCP Integration

Task 2.1 Tool Description & Selection (4)
K2.1.1

30% Misrouting with Minimal Descriptions, Near-Zero with Detailed Ones

Tool description as primary selection mechanism

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K2.1.2

Data-Driven Description Fixing: Target the High-Misrouting Pairs

Description overlap causes misrouting

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K2.1.3

Removing Keyword Rules Improved Routing from 78% to 94%

System prompt keyword sensitivity

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S2.1.1

Three Fields, All Critical: name, description, input_schema

Tool definition standard format

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Task 2.2 Error Handling & isError (5)
K2.2.1

Structured Errors: 78-95% Recovery vs 15% for Generic "Operation Failed"

MCP isError flag in CallToolResult

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K2.2.2

Without Classification, the Agent Wastes 5 Retries on a Permission Error

Error type classification

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K2.2.3

"Operation Failed" × 5 Retries × 30 Seconds = Customer Waiting for Nothing

Uniform error response anti-pattern

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K2.2.4

"Your Order Doesn't Exist" — But It Does, the Database Was Just Down

Access failure vs valid empty result

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S2.2.1

Retry Locally First, Propagate with Context If Recovery Fails

Local recovery vs coordinator propagation

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Task 2.3 Tool Count & Reliability (3)
K2.3.1

3 Tools = 97% Accuracy, 18 Tools = 51%: The Tool Count Curve

Tool count vs selection reliability

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K2.3.2

tool_choice: auto, any, tool, none

tool_choice four modes

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K2.3.3

Least Privilege: Each Agent Gets Only Its Role's Tools

Cross-role scoped tools

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Task 2.4 MCP Server Scope (5)
K2.4.1

Project Scope in .mcp.json, User Scope in ~/.claude.json

MCP server project vs user scope

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K2.4.2

${ENV_VAR}: Keep Secrets Out of Version Control

Environment variable expansion

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K2.4.3

MCP Resources: Browse Content Without Tool Calls

MCP Resources vs Tools

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K2.4.4

All MCP Servers Connect at Startup

MCP server auto-discovery

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S2.4.1

Use Community Servers for Standard Integrations

Community vs custom MCP servers

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Task 2.5 Built-in Tool Responsibilities (4)
K2.5.1

Each Built-in Tool Has One Job

Built-in tool responsibilities

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K2.5.2

When Edit Fails: Read + Write as Fallback

Edit failure fallback

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S2.5.1

Grep Entry Points, Read Key Files, Trace Imports

Incremental codebase understanding

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S2.5.2

Grep Each Export to Find All Cross-Module References

Cross-module function tracing

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