[No QA] Add agent-device skill and flow metadata framework

[kacper-mikolajczak]

Note

Depends on #87662 - that PR introduces the agent-device skill, its flows/ directory, and the initial sign-in.ad recording. This PR layers a metadata framework on top. Review and merge #87662 first; once it lands, the diff here collapses to just the framework-specific work (headers, matcher loop, split peer flows, complete-onboarding.ad).

Details

Layers a snapshot-driven, composable flow framework on top of the agent-device skill added in #87662. Flows now self-describe their preconditions, postconditions, baked-in parameters, and tags via comment headers, enabling an agent to pre-filter which flow applies to the current screen before executing anything - making in-app automation token-efficient and resilient to UI drift.

Explanation of Change

This PR extends agent-device flows with a metadata layer. It does not reintroduce the base skill (that ships in #87662); it adds:

1. A comment-header convention on .ad files (# @desc / # @pre / # @post / # @param / # @tag) that the replay parser already treats as no-ops, so headers cost nothing at runtime.
2. An agent decision loop documented in SKILL.md that uses the headers plus existing CLI primitives (agent-device snapshot -i, agent-device is exists, agent-device replay) to match, pick, execute, and verify a flow against the current state.
3. A peer-flow split: the flat sign-in.ad from [NoQA] Add agent-device glue-code skill for mobile testing #87662 becomes sign-in-new.ad / sign-in-returning.ad so agents can pick by @param account_state and fall back on @post mismatch. A new complete-onboarding.ad lands the user on Home.

Why flows need metadata

A flow without metadata is an opaque script. The agent cannot tell, from current state, whether the flow will do the right thing. That forces the agent to either read English prose and guess, or replay optimistically and hope. Both waste tokens and frequently land the session in a bad state.

The framework addresses this by asking every flow to declare, in # @-prefixed comment headers, the conditions under which it applies (@pre), where it will leave the app (@post), the constants it bakes in (@param), and a free-form category (@tag). The replay parser already treats # lines as no-ops, so headers are free at runtime.

Flow file anatomy

flows/sign-in-returning.ad
┌────────────────────────────────────────────────────────────────┐
│ # @desc    Sign in with the shared test account (returning).   │  ← Metadata
│ # @pre     role="textfield" label="Phone or email"             │    headers:
│ # @pre     role="button" label="Continue"                      │    parser
│ # @post    text="Home"                                         │    treats as
│ # @post    role="button" label="Search"                        │    comments;
│ # @param   email=agent-device-testing@gmail.com                │    agent reads
│ # @param   account_state=returning                             │    via grep.
│ # @tag     auth                                                │
├────────────────────────────────────────────────────────────────┤
│ fill "id=\"username\" || role=\"textfield\"..." "..."          │  ← Body:
│ press "role=\"button\" label=\"Continue\" || ..."              │    executed
└────────────────────────────────────────────────────────────────┘    verbatim

Agent decision loop

With the metadata in place, an agent follows a single loop before touching the UI manually:

           ┌───────────────────┐
           │ snapshot current  │
           │ state             │
           └─────────┬─────────┘
                     ▼
           ┌───────────────────┐
           │ grep '^# @' over  │
           │ flows/*.ad        │
           └─────────┬─────────┘
                     ▼
           ┌───────────────────┐   none pass
           │ filter by @pre    │─────────────┐
           │ (is exists ...)   │             │
           └─────────┬─────────┘             │
                     ▼ some pass             │
           ┌───────────────────┐   mismatch  │
           │ filter by @param  │─────────────┤
           │ vs user intent    │             │
           └─────────┬─────────┘             │
                     ▼ match                 │
           ┌───────────────────┐             │
           │ pick by @post     │             │
           │ goal proximity    │             │
           └─────────┬─────────┘             │
                     ▼                       │
           ┌───────────────────┐             │
           │ agent-device      │             │
           │ replay <path>     │             │
           └─────────┬─────────┘             │
                     ▼                       │
           ┌───────────────────┐    fail     │
           │ verify @post      │─────────┐   │
           │ (is exists ...)   │         │   │
           └─────────┬─────────┘         ▼   ▼
                     ▼ pass          ┌──────────────┐
           ┌───────────────────┐     │ try peer,    │
           │ goal reached?     │     │ else go      │
           │ yes → done        │     │ manual       │
           │ no  → loop        │     └──────────────┘
           └───────────────────┘

Composition

Flows are narrow snippets, not self-contained scripts. They have no open / close / context and no fixed wait calls - the caller owns the session. That keeps them chainable:

          [auth wall]
              │
              ▼
  ┌─────────────────────────┐   @pre: textfield + Continue
  │ sign-in-new.ad          │   @param: account_state=new
  │                         │   @post: Welcome + Join
  └───────────┬─────────────┘
              ▼
       [Welcome / Join]
              │  (one manual tap - documented gap)
              ▼
    [onboarding step 1]
              │
              ▼
  ┌─────────────────────────┐   @pre: "What's your work email?"
  │ complete-onboarding.ad  │   @params: purpose, first_name, last_name
  │                         │   @post: Home + Search
  └───────────┬─────────────┘
              ▼
          [Home]  ✓ goal

Peer flows (e.g. sign-in-new / sign-in-returning) share the same @pre but differ on @param and @post. The agent tries the param-matching peer first and falls back to the other when the post-check fails - the decision loop catches the miss before the session is corrupted.

Matching primitives

Nothing new was added to the agent-device CLI. The framework uses commands already shipped with the tool:

Primitive	Purpose
grep '^# @' flows/*.ad	Discover the whole catalog in one read.
agent-device snapshot -i	See current UI state.
agent-device is exists <sel>	Check a single @pre or @post selector.
agent-device replay <path>	Execute the flow body.

Fixed Issues

$ #88388
PROPOSAL:

Tests

Offline tests

N/A - changes are agent-tooling under .claude/ and do not affect app runtime behavior or network state.

QA Steps

N/A - no shipped-app changes. Title includes [No QA].

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
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  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[kacper-mikolajczak]

CC @BartekObudzinski

[kacper-mikolajczak]

Superseded by #88474 - relocated the head branch to callstack-internal/Expensify-App to allow co-operation on the PR with @BartekObudzinski.