spicebridge
spicebridge is an MCP server (and CLI) that lets an AI generate SPICE netlists and run ngspice simulations from natural-language/templated circuit descriptions. It supports AC/transient/DC analyses, measurement extraction, spec comparison, Monte Carlo/worst-case tolerance analysis, exporting (KiCad, schematic viewer), and optional cloud deployment via Cloudflare Tunnels.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Security posture is partially evidenced: cloud setup implies an API key and Cloudflare OAuth-based tunnel setup. However, the README does not describe transport/auth details (e.g., TLS-only enforcement, API key handling, rotation), authorization boundaries, or fine-grained permissions. Running ngspice and accepting natural-language inputs also increases the importance of robust input validation and sandboxing, which is not documented here.
⚡ Reliability
Best When
You want an agent-driven workflow for iterative analog design and verification using ngspice, ideally with local execution or a controlled deployment.
Avoid When
You require a well-defined, standards-based public REST API/SDK with strong authz controls and explicit rate-limit policies, or you cannot install/run ngspice on the host.
Use Cases
- • AI-assisted analog circuit design loops (template → simulate → verify)
- • Automated spec checking (e.g., bandwidth/gain/DC levels, PASS/FAIL)
- • Tolerance analysis for robustness (Monte Carlo and worst-case)
- • Rapid netlist generation and validation for SPICE circuits
- • Exporting simulation-driven designs to KiCad and a web viewer
Not For
- • Safety-critical hardware certification workflows without human validation
- • Production-grade, multi-tenant hosted services without additional hardening
- • Environments where exposing circuit design requests to a cloud tunnel is unacceptable
Interface
Authentication
README indicates an API key is generated for authentication in the cloud setup wizard, but does not describe fine-grained scopes or token lifetime/rotation.
Pricing
No pricing information provided; appears to be self-hosted via Python package and local ngspice.
Agent Metadata
Known Gotchas
- ⚠ Simulation failures may occur due to invalid netlists/model issues; retry strategy is not documented.
- ⚠ Stateful circuit IDs: agents must track circuit_id across calls and avoid mixing IDs between conversations.
- ⚠ ngspice must be available on PATH; cloud deployments require additional environment/config.
- ⚠ Monte Carlo/worst-case runs may be computationally expensive; no controls or limits are documented.
Alternatives
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Scores are editorial opinions as of 2026-03-30.