bpx-blueprint

blueprint

PREREQUISITE: Read bpx-shared.

Usage

bpx blueprint info <file.uasset> [--export <n>]
bpx blueprint bytecode <file.uasset> --export <n> [--range-source auto|export-map|ustruct-script|serial-full] [--strict-range] [--diagnostics]
bpx blueprint disasm <file.uasset> --export <n> [--format json|toml|text] [--analysis] [--entrypoint <vm>] [--max-steps <n>] [--range-source auto|export-map|ustruct-script|serial-full] [--strict-range] [--diagnostics]
bpx blueprint trace <file.uasset> --from <Node|Node.Pin> [--to-node <token>] [--to-function <token>] [--max-depth <n>]
bpx blueprint call-args <file.uasset> --member <token> [--class <token>] [--all-pins] [--include-exec]
bpx blueprint refs <file.uasset> --soft-path <path> [--class <token>] [--include-routes] [--max-routes <n>] [--max-depth <n>]
bpx blueprint search <file.uasset> [--class <token>] [--member <token>] [--name <token>] [--show <fields>] [--limit <n>]
bpx blueprint infer-pack <file.uasset> --export <n> [--entrypoint <vm>] [--max-steps <n>] [--out <dir>] [--range-source auto|export-map|ustruct-script|serial-full] [--strict-range] [--diagnostics]
bpx blueprint scan-functions <directory> --recursive [--name-like <regex>] [--aggregate]

Behavior

• info: summarizes blueprint/function exports.
• bytecode: extracts selected bytecode range as base64.
• disasm: disassembles bytecode (json|toml|text, optional analysis).
• trace: traces an execution path between nodes.
• call-args: inspects call-node argument pins/defaults.
• refs: reverse-searches soft-path usage on node pins.
• search: token-searches nodes/pins in one blueprint package.
• scan-functions: aggregates function names across a directory.
• infer-pack: emits CFG/callsite/def-use inference artifacts.
• bytecode/disasm support range selection (auto|export-map|ustruct-script|serial-full).

Command Matrix

Command	Use when	Notable defaults
info	summarizes blueprint/function exports.	Read-only path; safe for discovery.
bytecode	extracts selected bytecode range as base64.	Check bpx help for exact required flags.
disasm	disassembles bytecode (json|toml|text, optional analysis).	Check bpx help for exact required flags.
trace	traces an execution path between nodes.	Check bpx help for exact required flags.
call-args	inspects call-node argument pins/defaults.	Check bpx help for exact required flags.
refs	reverse-searches soft-path usage on node pins.	Check bpx help for exact required flags.
search	token-searches nodes/pins in one blueprint package.	Check bpx help for exact required flags.
infer-pack	emits CFG/callsite/def-use inference artifacts.	Check bpx help for exact required flags.
scan-functions	aggregates function names across a directory.	Check bpx help for exact required flags.

Recommended Workflow

• Start with bpx blueprint info to identify candidate exports and confirm whether you are dealing with a Blueprint asset, a WidgetBlueprint, or a generated class payload.
• Use search to narrow by member, node, or symbol name before moving to heavier analysis commands.
• Reach for trace and call-args when you already know the node or function you care about and want a focused dependency path.
• Use disasm or bytecode only after you have identified the target export and execution slice; they are best for instruction-level inspection, not broad discovery.
• Prefer refs when you need reverse lookup from a soft object path back to the Blueprint nodes/pins that mention it.
• For WidgetBlueprint construction and edit workflows, switch to bpx-widget. Keep this skill focused on Blueprint analysis rather than widget tree authoring.

Worked Recipe

bpx blueprint info ./Content/BP_Player.uasset
bpx blueprint search ./Content/BP_Player.uasset --member ApplyDamage --show name,class,member
bpx blueprint trace ./Content/BP_Player.uasset --from K2Node_CallFunction_12 --max-depth 6
bpx blueprint call-args ./Content/BP_Player.uasset --member ApplyDamage --all-pins
bpx blueprint disasm ./Content/BP_Player.uasset --export 21 --analysis --format text

• This is the preferred shape for "find a Blueprint function, inspect the call path, then disassemble the final target export".
• Use search and trace first so disasm stays focused on a specific export instead of becoming a broad dump.
• If your goal is WidgetBlueprint construction or widget property mutation, use bpx-widget instead of treating this analysis recipe as an authoring workflow.

Code-Aligned Caveats

• Large blueprints can produce very large payloads; constrain via --limit/--max-steps.
• refs --include-routes can be expensive; disable routes when doing broad scans.
• disasm --entrypoint implies analysis-oriented output.
• trace and call-args are most useful after search or info has already narrowed the target export/node set.
• For WidgetBlueprint edit flows and UE-openability caveats, prefer bpx-widget over embedding widget-authoring guidance here.

High-Signal Examples

bpx blueprint info ./Content/BP_Player.uasset
bpx blueprint search ./Content/BP_Player.uasset --member ApplyDamage --show name,class,member
bpx blueprint trace ./Content/BP_Player.uasset --from K2Node_CallFunction_12 --max-depth 6
bpx blueprint disasm ./Content/BP_Player.uasset --export 21 --analysis --format text