virtuoso-bridge-lite is a bridge that lets AI coding agents control Cadence Virtuoso and Spectre, electronic-design tools for analog and mixed-signal circuits, through Python, SKILL, or the command line. Engineers can use it locally or connect to a remote server to automate design work with an agent. The catalogue entries provide agent skills and instructions for working with the bridge.
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 skills add Arcadia-1/virtuoso-bridge-lite --skill virtuosogit clone --depth 1 https://github.com/Arcadia-1/virtuoso-bridge-liteWrote 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/arcadia-1/virtuoso-bridge-lite/virtuoso)<a href="https://agentmods.dev/skills/arcadia-1/virtuoso-bridge-lite/virtuoso"><img src="https://agentmods.dev/badge/skills/arcadia-1/virtuoso-bridge-lite/virtuoso/github.svg" alt="Measured on agentmods" height="20"></a>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.
<a href="https://agentmods.dev/skills/arcadia-1/virtuoso-bridge-lite/virtuoso"><img src="https://agentmods.dev/badge/skills/arcadia-1/virtuoso-bridge-lite/virtuoso.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00043 | $0.01244 |
| Opus 5.5 | $0.00017 | $0.00498 |
| Sonnet 5.5 | $0.00009 | $0.00249 |
| Haiku 4.5 | $0.00004 | $0.00124 |
Grade A, and why
virtuoso 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.
How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Virtuoso
Use the existing bridge for live Cadence operations. Python runs on the client; SKILL runs in the selected Virtuoso process. Local mode needs no SSH. Spectre execution is independent of this connection.
Choose the smallest interface
- One-off SKILL:
virtuoso-bridge eval 'EXPR',eval --stdin, orload FILE.il. - Common structured operations:
client.schematic,client.symbol,client.layout,client.libraryandclient.maestro. - Uncovered operations:
client.execute_skill(...)orclient.load_il(...). Raw SKILL is a supported escape hatch; a new wrapper is not a prerequisite.
Keep one-host use simple. Multiple servers/accounts/processes are optional; do not require profile inventory or process metadata for ordinary work. For GUI-equivalent simulation, preserve the netlist, models, corner and solver options and refresh the applicable PDK/CDF callbacks.
Before a live operation
Use the existing project virtual environment and configuration. If the bridge is not connected or the target changes, read connection.md. Pure documentation work and offline tests do not require a live connection.
Verify SKILL function signatures against the target's installed Cadence docs
and inspect actual library cells, symbol pins and CDF parameters before use.
Read local-docs.md for the verification workflow.
A miss in repository examples is not proof that a function does not exist.
Check Python signatures against the active package, and confirm availability
of version-specific commands with virtuoso-bridge --help.
When an installed skill is a symlink, resolve its directory before following repository-relative paths. References describe current supported behavior; an older client or daemon may lack the documented capabilities.
Editing and callback correctness
Use create() for a new or explicitly authorized replacement cellview and
modify() for an existing design. Preserve unrelated instances and user edits.
Read back connectivity and parameters, then check/save before netlisting.
Creation is not permission to delete an existing cell first.
What ships with it
24 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/batch-netlist-si.md 2.9 KB
- references/cellview-on-disk-layout.md 14 KB
- references/client-basics.md 2.5 KB
- references/connection.md 23 KB
- references/layout-python-api.md 21 KB
- references/layout-skill-api.md 4.0 KB
- references/library-python-api.md 4.7 KB
- references/local-docs.md 12 KB
- references/maestro-python-api.md 29 KB
- references/maestro-skill-api.md 23 KB
- references/netlist_samples/rc_cascade.cdl 256 B
- references/netlist_samples/rc_cascade.connectivity.txt 2.2 KB
- references/netlist_samples/rc_cascade.scs 600 B
- references/netlist.md 7.5 KB
- references/schematic-manifest-import.md 6.2 KB
- references/schematic-python-api.md 13 KB
- references/schematic-recreation.md 3.2 KB
- references/schematic-skill-api.md 3.2 KB
- references/shared-ciw-dialogs.md 20 KB
- references/simulation-flow.md 9.4 KB
- references/skill-finder-python-api.md 4.3 KB
- references/sos-python-api.md 7.4 KB
- references/symbol-python-api.md 6.2 KB
- references/troubleshooting.md 12 KB
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 b730145615e9
- 1mo ago Changed · -670 lines · -10 tokens per session 7bad75b9a7e8
- 1mo ago Changed · +5 lines 7d6dd5f43b73
- 1mo ago Changed · +5 lines e5cdfdbe2a2d
- 1mo ago Changed d9a7f9703eee
- 1mo ago Changed · +2 lines 0627cd53e4b0
- 1mo ago Changed · +13 lines 90fbc753661a
- 1mo ago Changed · +85 lines 1ee3daafb35a
- 2mo ago Changed · -3 lines 0a9b311228ac
- 2mo ago First seen · 661 lines · 53 tokens per session scan A 1ec66cfecb2a
virtuoso is a skill published in the GitHub repository Arcadia-1/virtuoso-bridge-lite (1,012 stars, last pushed yesterday), licensed MIT. It adds 43 tokens to every session and 1,244 once invoked, about $0.0002 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.
virtuoso compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| virtuosoArcadia-1/virtuoso-bridge-lite | Skill | 1.0k | yesterday | MIT | A | 43 | Claude Code, Codex |
| gke-compute-classesgoogle/skills | Skill | 22k | yesterday | Apache-2.0 | A | 83 | Claude Code, Codex |
| jetson-diagnosticNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 30 | Claude Code, Codex |
| holoscan-install-wheelNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 34 | Claude Code, Codex |
| offensive-z-waveSnailSploit/Claude-Red | Skill | 10k | 25d ago | MIT | A | 113 | Claude Code, Codex |
| doca-socket-relayNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 236 | Claude Code, Codex |
| hsb-flashNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | B | 94 | Claude Code |