CraftTweaker Support (1.12 7.99.23 and later)

BuildCraft Compat (1.12.2 only, 7.99.23 and later) includes support for CraftTweaker. Here's a rough list of commands available to you (note: <...> denotes ingredients, {...} denotes optional parameters, [...] denotes arrays):

Assembly Table (mods.buildcraft.AssemblyTable)

AssemblyTable.addRecipe(<output>, powerCostInMj, [<input1>, <input2>, ...]);
AssemblyTable.addRecipe(name, <output>, powerCostInMj, [<input1>, <input2>, ...]);
AssemblyTable.removeByName(recipeId);

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Combustion Engine (mods.buildcraft.CombustionEngine)

CombustionEngine.addCleanFuel(<fluid_fuel>, powerPerTick, timePerBucket);
CombustionEngine.addDirtyFuel(<fluid_fuel>, powerPerTick, timePerBucket, <fluid_residue>);

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BuildCraft adds recipes with the following IDs:

Chipsets: buildcraftsilicon:redstone_chipset, buildcraftsilicon:iron_chipset, buildcraftsilicon:gold_chipset, buildcraftsilicon:quartz_chipset, buildcraftsilicon:diamond_chipset.

Pluggables: buildcraftsilicon:plug_pulsar, buildcraftsilicon:light-sensor, buildcrafttransport:facaderecipes,

Lenses: buildcraftsilicon:lens-regular, buildcraftsilicon:lens-filter, and buildcraftsilicon:lens-regular-<colour>, buildcraftsilicon:lens-filter-<colour> (where colour is any of these: white, orange, magenta, lightblue, yellow, lime, pink, gray, silver, cyan, purple, blue, brown, green, red, black)

Wires: buildcrafttransport:wire-<colour> (where <colour> is one of the colours above).

Gates: buildcraftsilicon:gate-<operation>-<material>-no_modifier or buildcraftsilicon:gate-modifier-<operation>-<material>-<modifier> where <operation> is either and or or, <material> is iron, nether_brick, or gold, and <modifier> is either lapis, quartz or diamond.