What is waveform-mcp CLAUDE.md?

Repository instructions for a Rust MCP server that reads and analyzes VCD and FST waveform files, which record signal changes from digital hardware simulations. They document the server structure and its eight waveform-reading tools.

Use them when changing waveform-file parsing, signal lookup, hierarchy reading, event searches, or the MCP server's Rust implementation.

They make it clear how to locate signals, inspect hierarchies, read values, and find signal changes without learning the codebase from scratch.

How jiegec/waveform-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jiegec/waveform-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/jiegec/waveform-mcp/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/jiegec/waveform-mcp

Made for: Claude Code.

Wrote this? Show the measurements

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README.md

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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Per session 1,328 This file is loaded in full into every session.

When invoked 1,328 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01328	$0.01328
Opus 5.5	$0.00531	$0.00531
Sonnet 5.5	$0.00266	$0.00266
Haiku 4.5	$0.00133	$0.00133

Measured 15d ago against content hash 2964f02c29f2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

waveform-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 15d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude's Notes for waveform-mcp

Project Overview

An MCP (Model Context Protocol) server for reading and analyzing VCD/FST waveform files using the wellen library.

Architecture

main.rs: MCP server handler with tool routing, supports stdio and HTTP modes
lib.rs: Library exports from submodules
condition.rs/condition.lalrpop: Parser for conditional expressions (LALRPOP grammar)
formatting.rs: Time and signal value formatting utilities
hierarchy.rs: Signal/scope lookup by hierarchical path, plus "not found" messages
matcher.rs: Substring/glob/regex signal path matching (globset + regex)
signal.rs: Signal reading, event finding, metadata, and list_signals result formatting
suggest.rs: "did you mean" suggestions for unknown ids, paths and files (strsim)

MCP Tools (8 total)

open_waveform - Open VCD/FST files, assign optional alias
close_waveform - Close waveform and free memory
list_signals - List signals with pattern (substring/glob/regex, OR-ed) and hierarchy_prefix filters
read_hierarchy - Read hierarchy tree from an optional scope
read_signal - Read values at time_index or time_indices
get_signal_info - Get signal type, width, index range
find_signal_events - Find all changes in time range
find_conditional_events - Complex condition search with expression parser

Key Dependencies

wellen - Wavefile parsing
globset / regex - glob and regex signal path matching (src/matcher.rs)
strsim - "did you mean" suggestions for unknown ids/paths (src/suggest.rs)
rmcp - MCP server framework
tokio - Async runtime
lalrpop - Condition parser grammar
axum - HTTP server

Transport Modes

Stdio (default): cargo run --release
HTTP: cargo run --release -- --http --bind-address 127.0.0.1:8000

Condition Expression Syntax

Supported in find_conditional_events:

Signal paths: TOP.signal
Bitwise: ~, &, |, ^
Boolean: &&, ||, !
Comparison: ==, !=
Special: $past(signal) for previous value
Literals: 4'b0101, 3'd2, 5'h1A
Bit extract: signal[bit] or signal[msb:lsb]

Read the full file on GitHub · 108 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

15d ago Changed · +15 lines · +370 tokens per session 2964f02c29f2
2mo ago First seen · 93 lines · 958 tokens per session scan A a950cc5d0a69

Subscribe to this mod's changes

waveform-mcp CLAUDE.md is an instructions file published in the GitHub repository jiegec/waveform-mcp (49 stars, last pushed 13d ago), licensed MIT. It adds 1,328 tokens to every session, about $0.0053 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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waveform-mcp: Instructions file for Claude Code