WeChat Mini Program CLI Debug

Debug a WeChat Mini Program's LIVE runtime via the system `vince-mp` JSON CLI — one persistent session, then instant reused commands (pageData, query/tap, scan, console, doctor, log correlation). Use for "debug WeChat DevTools", "连上小程序", "$mp-cli-sup". NOT for browser automation, source-only edits, or non-WeChat work.

Vince Mini Program CLI Support

Debug a WeChat Mini Program's live runtime through the system vince-mp JSON CLI (an installed npm package, not a vendored binary). The defining workflow is session-first: connect once, then every later command reuses that one connection — repeat commands are near-instant and element uids persist across separate CLI calls.

Trigger boundary

Use this skill to: connect to / start a session against WeChat DevTools; inspect runtime state (route, pageStack, pageData, storage, systemInfo, console); query/snapshot elements and then tap/input them by uid (long-press via step); take a single-element or full screenshot; drive a camera-less scan; run a real project doctor (tsc + .ts/.js freshness + selected backend domain + LAN IP); diagnose "won't connect / 模拟器启动失败"; switch backend env and pull server error logs by requestId; probe Skyline Canvas/Camera or mock media.

Do not use it for ordinary web-browser automation, generic frontend source edits, Mini Program code review with no DevTools/runtime execution, or a Skyline→WebView renderer migration (that is mp-groundline).

The session-first workflow (do this)

bash

vince-mp session start          # connect ONCE: auto-resolves miniprogramRoot + ensures the
                                #   automation port (spawns `cli auto` only if it isn't live),
                                #   then attaches. May open/focus DevTools if it isn't running.
vince-mp doctor                 # optional health check (project + tsc + .js freshness + domain)
vince-mp data                   # read pageData — instant (reuses the session)
vince-mp query .submit-btn      # mint a uid (e.g. "button_0")
vince-mp tap button_0           # act by uid — the uid is STILL valid in this separate call
vince-mp data                   # confirm the effect
vince-mp scan PKG-2026-0605     # camera-less: onScanCode with a {type:"scancode",detail:{result,scanType,type}} event
vince-mp console                # console buffered since session start
vince-mp session stop           # when done (or it idle-reaps itself)

Any trigger whose handler does async work (tap/input/scan/step) resolves when DevTools DISPATCHES the call, NOT when the async work (wx.request→setData) finishes — wait or re-poll before reading the effect, whether the read is data, networkList, or mediaList.

Every command returns JSON and accepts --workspace-root <dir> and --port <n> (default 9420; --port only selects the automation port when a NEW session is first spawned for a workspace). The session is keyed per workspace-root, NOT per port — to debug two projects at once give each its own --workspace-root; --port alone will reuse the live session and not switch targets.

Command map (load references/cli-contract.md for exact schema)

The full command surface — session lifecycle, the read/act/diagnose/one-shot shorthands, the at-a-glance grouped map, plus the exact step list and error codes — lives in references/cli-contract.md. Load it before building or running any vince-mp command (its "At-a-glance command map" section is the grouped index; the sections below it are the exact schema).

Core rules

• Use the system vince-mp command as the only backend.
• Prefer the session; reach for --no-session/run --connect only when a one-shot or an explicit connection is required. Opening/focusing DevTools via launch (beyond session start ensuring the port) is a human-gated side effect — do it only with explicit user authorization.
• Keep paths under cwd/--workspace-root; file outputs need an explicit --output/path arg.
• Do not navigate, reLaunch, instrument media/network, or mock APIs unless that side effect is explicit in the request. session start ensuring the automation port (and possibly opening DevTools) is the one expected connect-time side effect.
• Verify every action with the CLI's JSON evidence; report failing error codes verbatim (e.g. APP_NOT_RUNNING, AUTOMATION_PORT_TIMEOUT, STALE_OR_UNKNOWN_UID).

Load protocol

1. Read this file first.
2. Before running vince-mp or building workflow JSON, load rules/runtime-protocol.md.
3. For exact command/step/error schema, load references/cli-contract.md.
4. For uid interaction or single-element screenshots, load rules/ui-element-workflow.md.
5. For Skyline Canvas/Camera/media, load references/skyline-media.md.
6. For connect/session/snapshot/console/network edge cases + failures, load references/evidence-and-failures.md.

Modules

• rules/runtime-protocol.md — session-first execution protocol + hard safety rules; read before running the CLI.
• rules/ui-element-workflow.md — uid + elementScreenshot workflow; uids persist in a session, stale only after navigation/mutation.
• references/cli-contract.md — exact command surface, session ops, shorthands, connection/workflow JSON, step list, error codes.
• references/skyline-media.md — Skyline snapshot protocol + Canvas/Camera/media instrumentation & mocks.
• references/evidence-and-failures.md — connect/session edge cases, uid lifetime, console/network caveats, failure codes.

Verifying the skill

• node scripts/validate-skill.mjs — structural validation (files, frontmatter, vince-mp help --json).
• node scripts/run_all.mjs — deterministic contract check: every documented command / shorthand / workflow step / error code / version pin is verified against the live vince-mp capabilities --json, so the docs can't silently drift from the CLI. --self-test proves each check discriminates.
• node scripts/check_release_gate.mjs — closes the release gate only on real evidence (executes each cited command by exit code; requires the harness self-test to still pass).
• node scripts/check_battery_clean.mjs — the stage-3 adversarial-hardening gate: reads the defect ledger (.loop/mp-cli-sup-battery.json) and asserts a trailing run of consecutive clean rounds with the required round shape and green regressions (--consecutive N). RED when the ledger is absent or has too few clean rounds.