LTspice MCP
Provides tools for editing LTspice .asc schematics, running LTspice simulations, and reading simulation logs and waveforms through stable JSON tools.
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Here is a step-by-step guide with screenshots.
In the name of God, the Most Gracious, the Most Merciful
LTspice MCP
LTspice MCP is a Model Context Protocol server for LTspice. An assistant can edit .asc schematics, run the simulator, and read logs and waveforms through stable JSON tools.
The .asc file is the source of truth. LTspice produces .net, .log, and .raw. Waveform reads stay inside a 2000-point budget.
The shared server framework is the Python package mcp-app-core. pip install of this server clones it from GitHub. This repository contains the LTspice editor, command line, and tools.
Requirements
Windows
Python 3.11 or newer
LTspice XVII (
XVIIx64.exe) or a later install (LTspice.exe)
Related MCP server: ltspice-mcp
Install
py -3.12 -m venv .venv
.\.venv\Scripts\python.exe -m pip install -e ".[dev]"pip install clones mcp-app-core. Do not clone that repository.
.\.venv\Scripts\ltspice-mcp.exe --describeRegister the server in Cursor and VS Code. The command does not remove a qspice entry from the config.
pwsh -ExecutionPolicy Bypass -File .\scripts\setup_mcp.ps1 -WorkspaceRoot "D:\path\to\your\circuit\folder"Then fully restart the IDE. Setup details are in AGENTS.md. Day-to-day use is in the user guide.
Documentation
Doc | Purpose |
Install, run, and the limits of the GUI | |
Every tool, with its required arguments | |
How a schematic becomes a simulation | |
Stable codes on tool failures | |
What the sandbox does | |
The released changes |
License
MIT
Available Tools
145 toolsadd_componentAdd ComponentC
Place a primitive component.
Inputs: kind (required), reference (required), schematic_path (required), x, +4 more.
add_component_from_asyAdd Component From AsyC
Place a symbol using the file name of an .asy in the workspace.
Inputs: asy_path (required), reference (required), schematic_path (required), x, +4 more.
add_component_symbol_drawingAdd Component Symbol DrawingB
Append a LINE, RECTANGLE, CIRCLE, or ARC to a symbol.
Inputs: kind (required), coords (required), asy_path (required), workspace_root.
add_hierarchical_blockAdd Hierarchical BlockC
Create a child sheet with In/Out pins and place it on the parent.
Inputs: reference (required), block_name (required), schematic_path (required), x, +2 more.
add_instructionAdd InstructionC
Add a SPICE directive or a comment.
Inputs: text (required), schematic_path (required), x, y, +1 more.
add_junctionAdd JunctionC
Split a wire so a coordinate becomes a junction.
Inputs: x (required), y (required), schematic_path (required), workspace_root.
add_library_componentAdd Library ComponentC
Place a library symbol by name.
Inputs: reference (required), symbol_name (required), schematic_path (required), x, +4 more.
add_library_includeAdd Library IncludeC
Add a .lib directive.
Inputs: library_path (required), schematic_path (required), workspace_root.
add_modelAdd ModelC
Add a .model directive.
Inputs: model_text (required), schematic_path (required), workspace_root.
add_net_labelAdd Net LabelD
Add a net label.
Inputs: x (required), y (required), name (required), schematic_path (required), +1 more.
add_wireAdd WireD
Add a wire. Exposed as add_wire by the tool module.
Inputs: x1 (required), x2 (required), y1 (required), y2 (required), +2 more.
apply_schematic_layout_specApply Schematic Layout SpecC
Replace a schematic with a built-in layout.
Inputs: schematic_path (required), spec_name, workspace_root.
cancel_batchCancel BatchBDestructive
Mark a batch cancelled. A finished batch stays completed.
Inputs: batch_id (required).
cancel_runCancel RunBDestructive
Stop a simulation started for this source path.
Inputs: source_path (required), workspace_root.
check_schematicCheck SchematicCRead-onlyIdempotent
Report structural problems without running LTspice.
Inputs: schematic_path (required), workspace_root.
close_live_gui_sessionClose Live Gui SessionC
Stop a GUI process this server launched.
Inputs: schematic_path (required), workspace_root.
close_remote_sessionClose Remote SessionB
Drop a session from memory. Files on disk are left in place.
Inputs: session_id (required).
collect_batch_resultsCollect Batch ResultsC
Return the stored batch result.
Inputs: batch_id (required).
compare_schematicsCompare SchematicsCRead-onlyIdempotent
Compare component values between two schematics.
Inputs: left_path (required), right_path (required), workspace_root.
compare_waveformsCompare WaveformsCRead-onlyIdempotent
Compare the means of one signal in two raw files.
Inputs: signal (required), left_path (required), right_path (required), workspace_root.
compute_thdCompute ThdCRead-onlyIdempotent
Total harmonic distortion.
Inputs: signal (required), raw_path (required), fundamental_hz (required), workspace_root.
create_asy_symbolCreate Asy SymbolC
Write a two-pin .asy symbol.
Inputs: output_path (required), value, prefix, description, +1 more.
create_schematicCreate SchematicC
Create an empty schematic.
Inputs: schematic_path (required), workspace_root.
create_starter_schematicCreate Starter SchematicC
Create a divider, RC, or buck starter schematic.
Inputs: schematic_path (required), kind, workspace_root.
describe_edit_capabilityDescribe Edit CapabilityCRead-onlyIdempotent
Describe which edits the clean-room editor performs.
Inputs: no named parameters.
describe_live_gui_supportDescribe Live Gui SupportCRead-onlyIdempotent
Describe the GUI launch support.
Inputs: no named parameters.
describe_mixed_signal_supportDescribe Mixed Signal SupportARead-onlyIdempotent
State what mixed-signal authoring LTspice can and cannot do.
Inputs: no named parameters.
describe_protocol_supportDescribe Protocol SupportBRead-onlyIdempotent
State that I2C and SPI scaffolds here are behavioral teaching circuits.
Inputs: no named parameters.
describe_reference_circuit_recipeDescribe Reference Circuit RecipeCRead-onlyIdempotent
Describe one reference circuit.
Inputs: recipe_id (required).
describe_schematic_edit_supportDescribe Schematic Edit SupportCRead-onlyIdempotent
Describe schematic edit support for clients.
Inputs: no named parameters.
describe_schematic_layout_specDescribe Schematic Layout SpecCRead-onlyIdempotent
Describe a built-in layout spec.
Inputs: spec_name.
describe_server_capabilitiesDescribe Server CapabilitiesARead-onlyIdempotent
Report the LTspice engine, tool groups, and feature flags.
Inputs: no named parameters.
describe_topology_authoring_supportDescribe Topology Authoring SupportCRead-onlyIdempotent
Describe the topology note format.
Inputs: no named parameters.
describe_topology_blockDescribe Topology BlockCRead-onlyIdempotent
Return one topology note.
Inputs: block_id (required).
download_remote_artifactsDownload Remote ArtifactsC
Return artifact paths recorded for a finished session.
Inputs: session_id (required).
evaluate_waveform_expressionEvaluate Waveform ExpressionC
Evaluate an expression built from raw signal names.
Inputs: raw_path (required), expression (required), max_points, workspace_root.
export_derived_rawExport Derived RawC
Write a small ASCII raw file containing one trace.
Inputs: signal (required), raw_path (required), output_path, workspace_root.
export_fft_spectrumExport Fft SpectrumC
Write an FFT magnitude CSV.
Inputs: signal (required), raw_path (required), output_path, workspace_root.
export_measures_csvExport Measures CsvC
Write .meas rows to CSV.
Inputs: log_path (required), output_path, workspace_root.
export_symbol_to_asyExport Symbol To AsyC
Write a two-pin .asy named for a placed component.
Inputs: reference (required), output_path (required), schematic_path (required), workspace_root.
export_touchstone_s2pExport Touchstone S2pC
Write a one-port-style S2P using S21 = output/reference and the other terms at 0.
Inputs: raw_path (required), output_signal (required), reference_signal (required), z0, +2 more.
export_waveform_asciiExport Waveform AsciiC
Write one signal as whitespace-separated text.
Inputs: signal (required), raw_path (required), output_path, workspace_root.
export_waveform_csvExport Waveform CsvC
Write selected signals to CSV.
Inputs: signals (required), raw_path (required), output_path, workspace_root.
export_waveform_spiceExport Waveform SpiceC
Write a PWL statement for one real trace.
Inputs: signal (required), raw_path (required), output_path, workspace_root.
filter_device_operating_pointsFilter Device Operating PointsC
Keep operating-point rows whose name contains device.
Inputs: device (required), log_path (required), workspace_root.
generate_netlistGenerate NetlistB
Write a netlist with LTspice -netlist, or the clean-room renderer.
Inputs: source_path (required), output_path, workspace_root.
get_batch_statusGet Batch StatusCRead-onlyIdempotent
Return a batch manifest summary.
Inputs: batch_id (required).
import_circuit_bundleImport Circuit BundleC
Unpack a zip of schematics into the workspace, or copy one .asc.
Inputs: bundle_path (required), workspace_root, destination_dir.
ingest_topology_contributionIngest Topology ContributionC
Store a validated contribution under the workspace.
Inputs: payload (required).
inspect_schematicInspect SchematicCRead-onlyIdempotent
Summarize a schematic.
Inputs: schematic_path (required), workspace_root.
list_componentsList ComponentsCRead-onlyIdempotent
List placed components.
Inputs: schematic_path (required), workspace_root.
list_includesList IncludesCRead-onlyIdempotent
List .lib and .include directives.
Inputs: source_path (required), workspace_root.
list_measuresList MeasuresCRead-onlyIdempotent
List .meas names.
Inputs: log_path (required), workspace_root.
list_plot_suggestionsList Plot SuggestionsCRead-onlyIdempotent
Suggest voltages and currents an agent can plot.
Inputs: schematic_path (required), workspace_root.
list_reference_circuit_recipesList Reference Circuit RecipesBRead-onlyIdempotent
List bundled reference circuits.
Inputs: no named parameters.
list_signalsList SignalsCRead-onlyIdempotent
List signals in a raw file.
Inputs: raw_path (required), workspace_root.
list_stepsList StepsBRead-onlyIdempotent
List stepped runs from a raw file and, when given, the log.
Inputs: raw_path (required), log_path, workspace_root.
list_subcircuitsList SubcircuitsCRead-onlyIdempotent
List .subckt blocks and hierarchical symbols.
Inputs: source_path (required), workspace_root.
list_topology_blocksList Topology BlocksCRead-onlyIdempotent
List topology notes.
Inputs: no named parameters.
list_workflow_instructionsList Workflow InstructionsCRead-onlyIdempotent
List bundled workflow notes.
Inputs: no named parameters.
materialize_recipeMaterialize RecipeC
Write a recipe schematic into the workspace.
Inputs: recipe_id (required), destination_path (required), workspace_root.
materialize_reference_circuitMaterialize Reference CircuitC
Write a built-in reference circuit.
Inputs: recipe_id (required), destination_path (required), workspace_root.
measure_bode_responseMeasure Bode ResponseCRead-onlyIdempotent
Bode magnitude and phase of output/reference.
Inputs: output (required), raw_path (required), reference (required), workspace_root.
measure_efficiencyMeasure EfficiencyDRead-onlyIdempotent
Average output power over average input power.
Inputs: i_in (required), v_in (required), i_out (required), v_out (required), +2 more.
measure_stability_marginsMeasure Stability MarginsDRead-onlyIdempotent
Gain and phase margins.
Inputs: output (required), raw_path (required), reference (required), workspace_root.
measure_step_responseMeasure Step ResponseCRead-onlyIdempotent
Step-response scalars.
Inputs: signal (required), raw_path (required), workspace_root.
measure_waveformMeasure WaveformCRead-onlyIdempotent
Measure avg, rms, max, min, pp, or peak.
Inputs: method (required), signal (required), raw_path (required), workspace_root.
merge_waveformsMerge WaveformsC
Return two traces side by side without writing a combined raw file.
Inputs: signal (required), left_path (required), right_path (required), workspace_root.
normalize_component_text_rotationNormalize Component Text RotationC
Reset attribute windows to left-justified text.
Inputs: schematic_path (required), workspace_root.
open_schematic_in_guiOpen Schematic In GuiC
Launch LTspice on a schematic without -b.
Inputs: schematic_path (required), workspace_root.
plot_waveformsPlot WaveformsB
Plot one or more comma-separated signals to a PNG.
Inputs: signals (required), raw_path (required), output_path, workspace_root.
poll_live_gui_sessionPoll Live Gui SessionBRead-onlyIdempotent
Report that polling a GUI session is unsupported.
Inputs: schematic_path (required), workspace_root.
poll_live_gui_session_eventsPoll Live Gui Session EventsCRead-onlyIdempotent
Report that GUI events are unsupported.
Inputs: schematic_path (required), workspace_root.
poll_remote_runPoll Remote RunCRead-onlyIdempotent
Return the status of a background session.
Inputs: session_id (required).
prepare_acPrepare AcC
Insert a .ac directive.
Inputs: schematic_path (required), f_end, sweep, points, +2 more.
prepare_dc_sweepPrepare Dc SweepC
Insert a .dc directive.
Inputs: step (required), stop (required), start (required), source (required), +2 more.
prepare_fourPrepare FourC
Insert a .four directive.
Inputs: traces (required), frequency (required), schematic_path (required), workspace_root.
prepare_funcPrepare FuncC
Insert a .func directive.
Inputs: definition (required), schematic_path (required), workspace_root.
prepare_icPrepare IcC
Insert a .ic directive.
Inputs: assignments (required), schematic_path (required), workspace_root.
prepare_loop_gain_analysisPrepare Loop Gain AnalysisC
Stage an AC loop-gain run using the extra-source method.
Inputs: schematic_path (required), f_end, f_start, workspace_root, +1 more.
prepare_measPrepare MeasC
Insert a .meas directive without replacing other measurements.
Inputs: statement (required), schematic_path (required), workspace_root.
prepare_monte_carloPrepare Monte CarloD
Point a component at mc() and step the run index.
Inputs: nominal (required), reference (required), tolerance (required), schematic_path (required), +2 more.
prepare_netPrepare NetC
Insert a .net network-parameter directive.
Inputs: output (required), source (required), schematic_path (required), rin, +2 more.
prepare_nodesetPrepare NodesetD
Insert a .nodeset directive.
Inputs: assignments (required), schematic_path (required), workspace_root.
prepare_noisePrepare NoiseC
Insert a .noise directive.
Inputs: output (required), source (required), schematic_path (required), f_end, +4 more.
prepare_opPrepare OpC
Insert a .op directive.
Inputs: schematic_path (required), workspace_root.
prepare_optionsPrepare OptionsC
Insert a .options directive.
Inputs: options (required), schematic_path (required), workspace_root.
prepare_paramPrepare ParamC
Insert a .param directive.
Inputs: name (required), value (required), schematic_path (required), workspace_root.
prepare_savePrepare SaveC
Insert a .save directive.
Inputs: traces (required), schematic_path (required), workspace_root.
prepare_stepPrepare StepC
Insert a .step directive.
Inputs: statement (required), schematic_path (required), workspace_root.
prepare_temperature_sweepPrepare Temperature SweepC
Insert a .step temp directive.
Inputs: step (required), stop (required), start (required), schematic_path (required), +1 more.
prepare_transfer_functionPrepare Transfer FunctionC
Insert a .tf directive.
Inputs: output (required), source (required), schematic_path (required), workspace_root.
prepare_transientPrepare TransientC
Insert a .tran directive.
Inputs: t_stop (required), schematic_path (required), t_step, t_start, +2 more.
prepare_worst_casePrepare Worst CaseC
Step a component between two corner values with table().
Inputs: low (required), high (required), reference (required), schematic_path (required), +1 more.
read_componentRead ComponentCRead-onlyIdempotent
Read one component.
Inputs: reference (required), schematic_path (required), workspace_root.
read_component_symbolRead Component SymbolCRead-onlyIdempotent
Read an .asy symbol.
Inputs: symbol_path (required), workspace_root.
read_device_operating_pointsRead Device Operating PointsCRead-onlyIdempotent
Read operating-point rows from a log.
Inputs: log_path (required), workspace_root.
read_fourierRead FourierBRead-onlyIdempotent
Read the Fourier section of a log.
Inputs: log_path (required), workspace_root.
read_logRead LogCRead-onlyIdempotent
Summarize a simulation log.
Inputs: log_path (required), workspace_root.
read_measuresRead MeasuresCRead-onlyIdempotent
Read .meas results.
Inputs: log_path (required), workspace_root.
read_net_connectivityRead Net ConnectivityCRead-onlyIdempotent
Return primitive pin-to-net connectivity.
Inputs: schematic_path (required), workspace_root.
read_noiseRead NoiseCRead-onlyIdempotent
Read noise lines from a log.
Inputs: log_path (required), workspace_root.
read_subcircuitRead SubcircuitCRead-onlyIdempotent
Return one .subckt body or a hierarchical sheet.
Inputs: name (required), source_path (required), workspace_root.
read_waveformRead WaveformDRead-onlyIdempotent
Read one budgeted waveform.
Inputs: signal (required), raw_path (required), t_end, t_start, +2 more.
read_workflow_instructionRead Workflow InstructionCRead-onlyIdempotent
Read one bundled workflow note.
Inputs: name (required).
refresh_schematic_in_guiRefresh Schematic In GuiB
Close and reopen the schematic so the GUI reloads the file.
Inputs: schematic_path (required), workspace_root.
remove_componentRemove ComponentDDestructive
Remove a component.
Inputs: reference (required), schematic_path (required), workspace_root.
remove_component_symbol_drawingRemove Component Symbol DrawingCDestructive
Remove one symbol drawing by index.
Inputs: index (required), asy_path (required), workspace_root.
remove_instructionRemove InstructionCDestructive
Remove a directive or comment containing text.
Inputs: text (required), schematic_path (required), workspace_root.
remove_junctionRemove JunctionDDestructive
Explain that LTspice junctions are implicit.
Inputs: x (required), y (required), schematic_path (required), workspace_root.
remove_net_labelRemove Net LabelCDestructive
Remove a net label.
Inputs: x (required), y (required), schematic_path (required), name, +1 more.
remove_wireRemove WireDDestructive
Remove a wire.
Inputs: x1 (required), x2 (required), y1 (required), y2 (required), +2 more.
rename_component_referenceRename Component ReferenceD
Rename InstName.
Inputs: reference (required), new_reference (required), schematic_path (required), workspace_root.
render_schematic_imageRender Schematic ImageD
Draw a simple schematic preview.
Inputs: schematic_path (required), output_path, workspace_root.
resolve_model_librariesResolve Model LibrariesBRead-onlyIdempotent
Search the workspace and the LTspice lib tree for a model name.
Inputs: model_name (required).
run_model_sweepRun Model SweepD
Run once per model name.
Inputs: models (required), reference (required), schematic_path (required), workspace_root.
run_monte_carloRun Monte CarloD
Prepare a Monte Carlo .step and run it.
Inputs: nominal (required), reference (required), tolerance (required), schematic_path (required), +2 more.
run_param_sweepRun Param SweepD
Add a .step and run once. LTspice expands the steps.
Inputs: statement (required), schematic_path (required), workspace_root.
run_simulationRun SimulationD
Run one batch simulation.
Inputs: source_path (required), ascii_raw, timeout_s, extra_switches, +1 more.
run_value_sweepRun Value SweepC
Run the schematic once per component value.
Inputs: values (required), reference (required), schematic_path (required), workspace_root.
run_worst_caseRun Worst CaseC
Prepare two corners and run them.
Inputs: low (required), high (required), reference (required), schematic_path (required), +1 more.
save_netlist_copySave Netlist CopyC
Copy a netlist inside the workspace.
Inputs: source_path (required), destination_path (required), workspace_root.
save_schematic_asSave Schematic AsC
Copy a schematic to a new path.
Inputs: schematic_path (required), destination_path (required), workspace_root.
scaffold_behavioral_subcircuitScaffold Behavioral SubcircuitC
Write a schematic whose only active device is a behavioral source.
Inputs: output_path (required), expression, workspace_root.
scaffold_i2c_deviceScaffold I2c DeviceC
Write a behavioral sketch of an I2C open-drain pull-up, not a protocol engine.
Inputs: output_path (required), workspace_root.
scaffold_spi_deviceScaffold Spi DeviceC
Write a behavioral sketch of a SPI data latch, not a protocol engine.
Inputs: output_path (required), workspace_root.
search_topology_blocksSearch Topology BlocksCRead-onlyIdempotent
Search titles and summaries.
Inputs: query (required).
send_live_gui_session_commandSend Live Gui Session CommandC
Report that GUI commands are unsupported.
Inputs: command (required), schematic_path (required), workspace_root.
set_component_parametersSet Component ParametersC
Set SpiceLine attributes.
Inputs: reference (required), spice_line (required), schematic_path (required), spice_line2, +1 more.
set_component_positionSet Component PositionC
Move a component and wires that ended on its pins.
Inputs: x (required), y (required), reference (required), schematic_path (required), +2 more.
set_component_symbol_pinSet Component Symbol PinD
Move or add a symbol pin.
Inputs: x (required), y (required), asy_path (required), pin_name (required), +2 more.
set_component_symbol_textSet Component Symbol TextC
Set one .asy attribute.
Inputs: value (required), asy_path (required), attribute (required), workspace_root.
set_component_valueSet Component ValueD
Set a component value.
Inputs: value (required), reference (required), schematic_path (required), workspace_root.
set_element_modelSet Element ModelD
Set a component model.
Inputs: model (required), reference (required), schematic_path (required), workspace_root.
set_parameterSet ParameterC
Add or replace a .param directive.
Inputs: name (required), value (required), schematic_path (required), workspace_root.
set_subcircuit_component_parametersSet Subcircuit Component ParametersC
Set SpiceLine on a component inside a schematic subcircuit file.
Inputs: reference (required), spice_line (required), schematic_path (required), spice_line2, +1 more.
set_subcircuit_component_valueSet Subcircuit Component ValueC
Set a value on a component inside a schematic subcircuit file.
Inputs: value (required), reference (required), schematic_path (required), workspace_root.
submit_batchSubmit BatchC
Run one schematic and keep a manifest of the artifacts.
Inputs: source_path (required), workspace_root.
submit_remote_simulationSubmit Remote SimulationC
Start a background local simulation and return a session id.
Inputs: source_path (required), workspace_root.
suggest_component_placementSuggest Component PlacementBRead-onlyIdempotent
Suggest the next free grid point to the right of existing parts.
Inputs: kind (required), schematic_path (required), workspace_root.
summarize_batchSummarize BatchCRead-onlyIdempotent
Summarize raw files sitting in a batch directory.
Inputs: batch_dir (required), workspace_root.
summarize_device_operating_pointsSummarize Device Operating PointsCRead-onlyIdempotent
Count operating-point rows by unit.
Inputs: log_path (required), workspace_root.
summarize_tolerance_analysisSummarize Tolerance AnalysisCRead-onlyIdempotent
Summarize min, max, and mean of a stepped trace.
Inputs: signal (required), raw_path (required), workspace_root.
validate_topology_contributionValidate Topology ContributionCRead-onlyIdempotent
Check that a contribution JSON object has the required keys.
Inputs: payload (required).
write_workspace_text_fileWrite Workspace Text FileC
Write a text file inside the workspace.
Inputs: content (required), relative_path (required), workspace_root.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
TDQS
Scored across 145 tools
145 tools include many overlapping run/prepare/measure/export operations (e.g., run_simulation, submit_batch, submit_remote_simulation; prepare_ac vs add_instruction). While names are descriptive, an agent will struggle to choose the right tool for a given task.
All tool names use snake_case with a leading verb (add_, get_, list_, prepare_, run_, etc.), forming a consistent verb_noun pattern. No camelCase or mixed conventions.
145 tools is extreme for any MCP server, far exceeding the 50+ threshold for mismatch. Many tools are thin wrappers around specific SPICE directives or analysis types, bloating the surface.
The surface covers schematic editing, simulation setup, execution, batch/remote runs, analysis, and export comprehensively. Minor gaps exist, such as no direct schematic deletion or fully supported live GUI control, but core workflows are complete.
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