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ethan-hub26

embedcalc-mcp

by ethan-hub26

AWG Wire Gauge & Voltage Drop

embedcalc_awg_wire
Read-onlyIdempotent

Compute AWG wire properties and voltage drop for copper pairs. Input AWG, supply voltage, current, one-way length, and temperature to get diameter, loop resistance, drop percentage, and verdict.

Instructions

AWG wire properties (ASTM B258) and round-trip voltage drop for a copper pair: diameter, area, loop resistance (2× length, go & return), drop %, and a PASS/WARNING/FAIL verdict (<3% / 3-5% / >5%).

Args: awg (e.g. 20), supply_v, current_a, length_m (one-way), temp_c (default 20). Returns (structured): { diameter_mm, area_mm2, loop_resistance_ohm, voltage_drop_v, drop_percent, verdict }. Example: AWG20, 5 V, 2 A, 1 m -> 0.067 Ω loop, 2.7% drop, PASS.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
awgYesWire gauge AWG number
temp_cNoConductor temperature in °C
length_mYesOne-way cable length in m (loop = 2×)
supply_vYesSupply voltage in V
current_aYesLoad current in A

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
verdictYes
area_mm2Yes
diameter_mmYes
drop_percentYes
voltage_drop_vYes
loop_resistance_ohmYes
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate read-only and idempotent. Description adds detailed behavioral traits: loop resistance calculation (2× length), temperature compensation, verdict thresholds. Exceeds annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Concise, front-loaded with purpose, then args, returns, and example. Every sentence is informative with no wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given output schema exists but not shown, description fully covers return structure. For a single-purpose calculator, all necessary context is provided.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema covers 100% of parameters with descriptions. Description adds meaning beyond schema by clarifying length_m is one-way and loop is 2×, and gives example values. Adds context without redundancy.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states it computes AWG wire properties and round-trip voltage drop, with specific outputs listed. Distinguishes from siblings by naming the exact resource and computation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides example usage and clearly describes inputs/outputs, but does not explicitly state when to use this tool versus related tools like embedcalc_pcb_trace_width. However, the specificity makes context clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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