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get_signal_value

Reads the current value of a hierarchical signal during Vivado simulation, with optional binary, hex, decimal, unsigned, or ASCII radix formatting.

Instructions

Get current value of a signal in simulation.

Input Schema

NameRequiredDescriptionDefault
radixNoDisplay radix (default: hex)
signalYesHierarchical signal path

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.5.0

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden, yet it discloses nothing beyond the obvious read semantics. It omits that a launched/running simulation is required, how unknown or unset signals are reported, and how the radix affects the returned representation.

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

Conciseness4/5

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

One sentence with zero waste, front-loaded with the verb and resource. It is terse to the point of under-specification rather than bloated, so it scores well on economy only.

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

Completeness3/5

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

With only two parameters and full schema coverage the definition is workable, but there is no output schema and no statement of what the return value looks like or its dependence on radix. A running-simulation precondition would also be needed for an agent to call this reliably.

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

Parameters3/5

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

Schema description coverage is 100%, so both 'signal' (hierarchical path) and 'radix' (enum with default hex) are already documented. The description adds no syntax or format detail beyond the schema, so the baseline 3 applies.

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

Purpose4/5

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

States a specific verb and resource ('Get current value of a signal') scoped to simulation, which is clear. It does not distinguish itself from the sibling 'get_signal_values' (plural), leaving the agent to guess which retrieval tool to pick.

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

Usage Guidelines2/5

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

No guidance on when to use this single-signal getter versus get_signal_values, and no stated prerequisite such as an active simulation session. The agent must infer usage entirely from the name.

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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