Koppar

Lay exact copper by hand where the routers leave a gap: tracks as polylines on one copper layer, and through vias. width_mm, diameter_mm and drill_mm default to the board's current track and via sizes. Nets must exist on the board. Nothing is checked here: run_drc afterwards, and ripup_routing takes copper back out.

Give the design a footprint of your own: a KiCad .kicad_mod (the file's text) for a package KiCad's libraries lack. It joins the design's "custom" footprint library and is used as "custom:<name>": pass that to create_custom_symbol (footprint=) or name it in the SKiDL script's footprint=; the board builder loads it like a library footprint and the KiCad project download carries it. The pads must be numbered like the pins. The CLI: `koppar footprint <design> part.kicad_mod`.

Unpack a ZIP into the project folder, keeping its paths: new footprints into a .pretty library the fp-lib-table names, 3D models, a library table. Existing files are kept unless overwrite is true; the reply lists written, replaced and kept files. Base64, up to about 18 MB zipped.

Dense placement by simulated annealing: wirelength inside the outline with courtyard gaps, edge connectors held on their edge, fixed and locked parts held, keepout rectangles kept clear (routing corridors), and a per-pad price for the bottom side (flip_cost, mm of wirelength; each bottom-side pad whose net has top-side pins costs a via). Starts from the current positions unless from_scratch. Slower than auto_place (a minute per 600k iterations) and much denser. Check overlapping_pairs and run_drc afterwards.

Pack footprints inside the board outline with Koppar's heuristic placer (ratsnest-driven, courtyard-legal). By default every unlocked footprint moves and locked ones stay; refs names exactly which move (all others stay). Constraints: fixed (exact origin positions and rotation, never moved; locked footprints likewise), side, keepouts (rectangles), groups, near (ref within maxMm of an anchor), edge (ref to "left|right|top|bottom", optionally "@mm" along that edge from the outline's top-left corner). Nothing is left past the outline except a USB/barrel/jack opening's 1.2 mm lip; placement_notes lists every part that could not be placed where asked. Coarse by design: refine the result with place_footprints.

A filled pour cut into islands by routing: one through-via per island that KiCad finds cut off from its net, placed well inside the island and inside the net's main copper on another layer, clear of every other net between. Reports the islands it found no site for. Run run_drc afterwards.

Check the copper against the project's net classes and differential pairs, which KiCad's DRC does not: every class or pair net's narrowest track and the length below its class width, and every pair (X_P/X_N, X+/X-, CAN X_H/X_L) with its coupled share at the class's diff_pair_gap, both lengths and the skew. Routing applies the same rules.

Judge the copper by physics, which KiCad's DRC does not: impedance from the stackup on controlled nets, IR drop and heating on rails with a stated current, pair and lane skew, a ground via beside every high-speed layer change, 3W spacing between high-speed runs, and the via path under exposed paddles. Each check runs only when the board states something it can judge. With repair, the fixable findings are fixed in place (track width, skew meanders, return vias, widened rails), each kept only if KiCad counts nothing worse. finish_board runs the same repairs.

Pick which offer a BOM line uses: the line's references and a seller part number or MPN from its offer or alternatives in get_bom; null goes back to the automatic pick. Sourcing only: a different component is a circuit change.

Sweep the routing: zero-length and duplicate tracks, stub tracks (a free end, and everything the track touches stays joined without it), and vias that meet their net on fewer than two layers. Contact is copper overlap, as KiCad judges it. Refills the zones first so pours count as connections. Locked items stay. The board is put back if the unconnected count or the DRC errors rise. A track running on past its last junction is cut back to it (trim_overhangs). list_removed names every item that went.

Move every resistor, capacitor and inductor bought outside JLCPCB's basic library onto an in-stock basic-library part of the same value, package and (capacitors) at least the same voltage rating. Each part outside that library adds a loading fee to a JLCPCB order, usually more than the part. Each swap becomes the line's choice (choose_bom_part with null undoes it); lines with no readable value, no SMD size or no basic part are reported and left alone.

After route_board: re-route the weakly coupled differential pairs one at a time, least coupled first. Both legs are ripped and routed alone around everything else as a pair; the new copper stays only when the pair's coupled share rises by min_gain_pct, its skew stays within max_skew_mm, KiCad counts no new open item or DRC error, and the board gains at most max_extra_vias vias. Pairs routed with the whole board lose their lanes; alone they couple. Run check_net_rules before and after.

Register a connectable schematic symbol for a part that is NOT in KiCad's libraries (search_kicad_symbol returned nothing). Use this for specialty ICs — LED-matrix drivers, niche sensors, etc. — INSTEAD of telling the synthesizer to model the part with discrete passives (which leaves every pin dangling and breaks the board). Provide the full datasheet pinout. The part then becomes available to the synthesizer as Part('custom', '<name>') with the exact pin names you supply here, and is added to the Verified parts table. A part with three or more pins needs footprint= naming a real, in-library footprint for its package (search_kicad_footprint with the family and pin count, e.g. 'LGA-14'); the call is rejected without one, since a generated grid of pads cannot be assembled. List every pad of the footprint, NC pins included. When the package is not in KiCad's libraries, bring your own footprint instead: footprint_mod takes the whole .kicad_mod file as text (KiCad 6+, up to 1 MB; the CLI reads it with `koppar custom-symbol --footprint-file`). It is checked as a KiCad footprint, every pad must have a pin with that pad's number (and every pin a pad), and it is stored as 'custom:<name>': the symbol uses it, and it goes on the board, into project.zip and into the fp-lib-table. footprint is then not needed. The name is used for file names: letters, digits and _ . + - (anything else becomes _). The symbol belongs to design_id.

Start a new design from the user's brief (what the board must do, its interfaces, power, size and constraints). Returns the design_id every other tool takes and the web_url where the user follows the design. Uses no generation quota: the work is done by you.

Move a design (or a board workspace) to the trash: it leaves list_designs and the web app, and restore_design brings it back for 7 days, after which it is removed for good. permanent removes it, its files and its session right away. Refused while a run on it is in progress. The CLI: `koppar delete <design>`.

For every net still open (or the nets named): each pad with the escape corridors free on its own layer, whether a via can be dropped beside it at all, and what blocks it (which part's pads, which net's tracks or vias, the board edge). A pad with no free corridor and no via site is CRAMPED — no router can reach it; the advice names the parts to move. Otherwise the advice says which nets to rip and route first. Use it instead of repeating repair_board on a net that keeps failing.

Apply SEARCH/REPLACE patches to your latest script and re-run every check, as submit_circuit does. The latest script is your last submission when it was sent back (attempt_N_circuit.py), otherwise the design's circuit.py. Each search must match the current file exactly once (whitespace-sensitive); an empty replace deletes. Nothing is applied if any block fails to match.

Export the assembled board as STEP (3D models, DNP parts left out). Download it as workspace.step; workspace.zip includes it.

Refill every copper zone with KiCad's zone filler.

Close what the router left open the way a designer does: for each open net the diagnosis names the copper boxing it in; that copper is ripped (never a poured net), the open nets are routed FIRST into the space, then the ripped nets go back around them; up to `rounds` rounds, each kept only if KiCad counts fewer unconnected items. Use it after route_board leaves a handful of nets open (route_board's default pipeline already runs three rounds; this adds more, or follows a single route); repair_board never moves the blockers.

What the board plan is decided from: the computed minimum board, BOARD STATS (pad density, fine-pitch parts, fanout), the parts and nets, board instructions the user gave, and the plan schema with its rules. Needs an accepted schematic.

The board as it stands: copper layers, outline, design rules and net classes, counts (footprints, nets, tracks, vias, zones, keepouts, KiCad unconnected items), zones and keepouts, and every footprint with reference, value, footprint, position (origin, mm), rotation, side, locked, DNP, courtyard box and 3D models.

The design's latest board job: its status and, once it ends, its result or error. wait_s holds the call until it ends.

The board run: stage, size, layers, placement, routing completion, open nets, DRC counts; once finished, DRC violations by type, whether the fab files are released and, when not, the diagnosed causes (first = fix first: parts that did not fit, collisions, missing footprints, open nets, thin power). wait_s holds the call until the run ends (or that many seconds pass).

The live-priced BOM: each line with references, value, footprint, the chosen offer (seller, part number, MPN, price, stock, match quality), alternatives and totals. refresh asks the sellers again (tens of seconds).

Where a design stands: the brief, the schematic (accepted or the last blocking error, ERC, part and net counts, submissions), the board run, the readable files, and the next step.

Download URLs for the design (KiCad project, schematic, netlist, BOM CSV, board file, 3D model, Gerbers, order bundle) and which are available now. They take the same Authorization: Bearer API key; the CLI fetches them with `koppar download <design> <artifact>`.

Whether the board has earned its fab files (zero serious DRC errors, nothing unconnected), and if not, why not.

Return the full pin list (number, name, electrical type) and description for a specific KiCad symbol. For some high-risk power parts it also returns curated topology_constraints from datasheet-style application notes and footprint_suggestions. Use this before writing pin connections (e.g. mcu['VCC'] += vcc) so names, constraints and footprints match the symbol exactly. For a part found in KiCad, the result is ALSO enriched with that part's topology + required external parts from a datasheet database (merged into topology_constraints). For a part NOT in KiCad (search returned nothing), call this with library='custom' and name='<part number>': the component database returns its datasheet link, package and an UNVERIFIED machine-extracted pinout. That is not a symbol: register the part with create_custom_symbol, whose pinout is checked against the datasheet. Pass design_id so the lookup is recorded for the design's dossier and a registered part belongs to it. Give library and name, or up to 12 of them in parts.

One price for a quantity: parts from the sellers, the board and assembly from the chosen provider's quote, setup fees, and what the total does not include.

Everything a design review needs in one text: the brief, the dossier, circuit.py and the compiled connectivity (every net with every pin and its function), with the reviewer instructions. Review it yourself and fix blockers with edit_circuit.

How to drive Koppar end to end, and the instructions for each stage you do yourself: "research" (part research and the dossier), "synthesis" (writing the SKiDL schematic), "review" (design review), "board" (the board plan). Read the stage guide before doing that stage.

Bring an existing KiCad project in as a board workspace: the project folder as a ZIP (the .kicad_pcb, .kicad_pro, schematics, footprint and 3D-model folders), base64-encoded, up to about 18 MB zipped. The CLI does this with `koppar import <folder>`. Or from_design_id: the KiCad project of a design the pipeline built (its board, rules, schematics and custom footprints) opened as a workspace, to change the design rules, place and route it with the board tools and put the result back with upload_board (workspace_id). Returns the design_id the board tools take and a first get_board_info.

Send the Koppar team feedback from the user: about Koppar in general, or about one design (design_id). A rating from 1 to 5, a message, or both. Use it when the user asks you to pass something on, or tells you what worked or did not; say in the message what happened, in their words where you can. The team reads every one.

The snapshots of this board, newest first. Revision N is the board as it was before change N (revision 0 is the project as imported); restore_board_revision N goes back to it.

The user's designs, newest first, including ones made in the web app (an agent can continue those too) and board workspaces (kind "board workspace"). With trashed, the designs in the trash instead (deleted, restorable for 7 days).

The PCB and assembly providers, whether each can quote and take this kind of board today, and what a handoff sends them.

Put footprints exactly where given: KiCad board coordinates of the footprint origin in mm (y grows downward), rotation in degrees as KiCad shows it, side F or B (changing side flips the footprint, as KiCad does), locked. dx_mm/dy_mm/drot_deg move relative to where it is. Nothing is nudged or legalized: overlaps are for run_drc to report. Unknown references come back in missing.

After route_board and prune_vias: rip one net at a time, most vias first, route it alone around everything else at a high via price, and keep the new copper only when KiCad counts fewer vias with no new open item or DRC error (a reroute that cuts a pour into islands first gets one via per island, bridge_islands). Run run_drc and get_score afterwards; a second pass sometimes finds more.

Remove every via the board does not need: groups of vias come out, the zones are refilled and KiCad's unconnected count compared, and a via stays only if removing it disconnects something. nets limits the candidates (GND and the plane rails first: pours already join most of their pads). Runs for minutes on a large board; then fill_zones, run_drc.

Read a text file of the design: prompt.txt (brief), dossier.md, circuit.py, circuit.net, result.json, circuit.erc.json (KiCad ERC violations), attempt_N_circuit.py / attempt_N_error.txt, board_plan.json, pcb_result.json, pcb_run.log, circuit.drc.json (KiCad DRC), netclasses.resolved.json, dfm.json, harness.log.

An exact 2D picture of the board as an engineer reads it: copper per layer (the facing layer full strength, the others faded), pads, vias, pours, outline, courtyards and refs. side top|bottom, region [x, y, w, h] mm for a crop, drc_markers to circle every DRC violation, ratsnest to draw the open connections, highlight_nets/highlight_refs in magenta. The pixel-per-mm scale and region come back so a follow-up crop is exact. Download workspace.render.png.

Keep the copper of every net it already connects and route the nets still open around it: route_board with preserve_existing. The learned router service by default; router "ts" for the local router, which also keeps partial copper and runs its last-chance welds and plane-island bridges. Default budget 120 s.

Put the board and its rules back as they were in a revision from list_board_revisions. The current board is saved as a new revision first, so the restore itself can be undone.

Put a deleted design back from the trash (within 7 days of delete_design).

Delete tracks and vias: of the given nets, on the given layers (vias are not layer-filtered), with an end inside region, or all. Filters combine. tracks/vias choose which kinds (both by default); zones also deletes the copper zones (pours) the same filters match (a zone inside region), never keepout areas. Locked items stay unless include_locked.

Route under the project's rules and net classes. By default (no nets, no router, none of the single-route options below) it runs the full route pipeline Koppar benchmarks: the learned router on the whole board racing the negotiated router on a copy (the board with fewer open items, then fewer DRC errors, goes on), repair rounds on what stays open, the local finish, copper finishing (0/45/90 runs) and one repair round after it, inside one wall-clock cap: time_budget_s is that cap (default 1200, up to 1500), so the job runs up to about 20 minutes: follow it with get_board_job. The result gives the final unconnected items and DRC errors and a pipeline summary: the counts after the route and after each finish, which arm won, whether the copper finishing was kept. preserve_existing unset keeps the copper of a board that has tracks or vias (the negotiated arm then does not run: it routes from scratch) and routes a board without any from scratch; false routes every net again. nets, router, or any single-route option (pours, rule overrides, via_cost, grid_mm, negotiation_rounds, ml_options, seed_existing, fewest_vias, pairs_first, class_vias) runs ONE route with that router instead, for expert control: nets limits it to those nets; preserve_existing (default true) keeps every track and via already on the board and routes only what is still open. pours: "keep" (the default when the board has zones) keeps the board's zones and routes every net as tracks; "engine" plans a GND pour and fans GND to it by via. Rule overrides apply to this run only. via_cost raises the price of a via in the local router (its default is 2), for fewer vias at some completion cost; the learned router takes its via discipline in ml_options. A single route takes time_budget_s (default 120, up to 900).

KiCad's DRC on the board as it is now, with schematic parity when the project has its schematic: error and warning counts by type, shorts, unconnected items, parity items, and the first violations with their items and positions (types filters, max_violations caps; default 40). Also mount_fit: parts reaching through the board (mid-mount jacks, USB-C) checked against their cutouts from their 3D models, with any body area over board material or within the fab's 0.2 mm milling tolerance of the cut.

Store the research dossier (markdown with ## Parts list, ## Power rails, ## Topology constraints, ## Notes, as the research guide describes). The verified pin tables from your lookups on this design are appended, and verified entries the design already had for parts you did not look up again are kept. Reports every (library, name) in the parts list that does not exist, with catalog candidates.

Search KiCad's standard footprint libraries. Returns 'Library:Footprint' strings suitable for the footprint= argument of Part(...). Query with the package family and pin count ('LGA-14', 'QFN-24', 'SOIC-8'), optionally a body size or pitch. When no name contains every word, near_misses lists footprints of the same package, ranked by body size and pitch. Pass design_id so the lookup is recorded for the design's dossier and a registered part belongs to it.