Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/neveltyc/vcd_analyzer/skillnpx skills add neveltyc/VCD_ANALYZER --skill skillgit clone --depth 1 https://github.com/neveltyc/VCD_ANALYZERWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/neveltyc/vcd_analyzer/skill)<a href="https://agentmods.dev/skills/neveltyc/vcd_analyzer/skill"><img src="https://agentmods.dev/badge/skills/neveltyc/vcd_analyzer/skill.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00158 | $0.04098 |
| Opus 5 | $0.00079 | $0.02049 |
| Sonnet 5 | $0.00032 | $0.00820 |
| Haiku 4.5 | $0.00016 | $0.00410 |
Grade A, and why
vcd-waveform-debug scanned grade A with 1 finding 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 3d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://raw.githubusercontent.com/neveltyc/VCD_ANALYZER/v1.5.0/vcd_analyzer.py -o vcd_analyzer.py How it starts
The opening of the file, as written. The whole thing — 327 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VCD Waveform Analyzer — Agent Skill
What this tool does
vcd_analyzer.py is a single-file, zero-dependency Python CLI that parses IEEE 1364 VCD files and exposes seven query commands. It reads VCD files in streaming mode (constant memory regardless of file size), handles QuestaSim bit-exploded buses, Extended VCD port states, and malformed/hostile inputs safely.
All commands support --json for structured output. Always use --json when calling from an agent.
Setup (one-time)
curl -fsSL https://raw.githubusercontent.com/neveltyc/VCD_ANALYZER/v1.5.0/vcd_analyzer.py -o vcd_analyzer.py
python3 vcd_analyzer.py --version # expect: vcd_analyzer 1.5.0
No pip install, no virtualenv, no dependencies. Python 3.9+.
Decision tree: which command to use
User wants to know...
├─ "What's in this VCD file?"
│ └─ info → file overview, signal count, time span, scopes
├─ "What signals exist?" / "Find signals matching X"
│ └─ list → signal paths with width and type
├─ "What happened between T1 and T2?"
│ └─ dump → raw value-change events in time order
├─ "Which signals are active/static?"
│ └─ summary → per-signal change count, rise/fall edges, unique values
├─ "What is the value of X at time T?"
│ └─ snapshot → all known signal values at one time point
├─ "What changed between T1 and T2?"
│ └─ compare → diff of signal values at two time points
├─ "When does condition C hold?" / "Find handshakes" / "Find state=X"
│ └─ search → condition-based search with three sub-modes:
│ ├─ interval → time ranges where condition is true (no --show)
│ ├─ segment → intervals + observed signal values (with --show)
│ └─ event → per-transition snapshots (with a changed(SIG) term)
Command reference
Universal options (apply to every command)
| Option | Effect |
|---|---|
--json |
Always use this. Compact JSON to stdout. |
--limit N |
Max results. Default 500. --limit 0 = unlimited. |
--verbose |
Extra fields (width, type, raw values). Disables default limit. |
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.
- 3d ago First seen · 327 lines · 158 tokens per session scan A a2bf771adac9
vcd-waveform-debug is a skill published in the GitHub repository neveltyc/VCD_ANALYZER (11 stars, last pushed 10d ago), licensed MIT. It adds 158 tokens to every session and 4,098 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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