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Case study · Browser automation
Meridian Operations · upstream system without an APIFive deterministic steps. 99.2% success. No API.
The upstream system offers no API, no webhook, and no bulk-import mechanism. Playwright drives the browser through a stable five-step UI flow; the LLM is reserved for diagnosing failed runs from captured artifacts.
5
Deterministic Playwright steps per registration
99.2%
Success rate after one retry
2
Third-party error codes recovered automatically
Built with
The problem
No API. No webhook. No bulk import. A 15-minute browser session per account.
The upstream third-party system supports exactly one interface: its web UI behind a login form. The team was stepping through a five-step flow per account, dozens of times per month. Each session required staying focused on the browser for 15 to 20 minutes — and missing a branch condition on step 2 meant starting over from the beginning.
- No public API, full stopThe upstream third-party system offers no API, no webhook, and no bulk-import mechanism. The only supported interface is its web UI. Looking for an undocumented endpoint returned nothing usable. The manual browser session was the only path.
- Shared transmissions page with no per-user filterAfter submitting a unique account identifier, the operator polled a shared page that showed submissions from all team members interleaved. Finding their own row meant scanning by username and submission time — a task that got harder the busier the team was.
- Two error codes with known recoveries, zero documentationTwo upstream codes — one meaning the identifier already exists, one meaning the account number is on file — have clear, recoverable responses. But the system displayed them as opaque codes with no guidance. Operators learned the responses by trial and error.
- Conditional branching on account statusStep 2 varies: if the account is on file, the operator goes to an update path; if not, a creation path with a tri-state agency-assign field and an identity-document checkbox. Missing the branch condition meant starting the session over.
Manual session · per account
15-20 min · attention required1Sign in0:48
2POST identifier · poll shared page4:22
3Branch (on-file? new path?)1:15
4Toggle checkbox + tri-state field0:34
5Capture bond + commit3:18
—Branch missed → start over+15:00
Five steps · one branch · zero APIRedo on miss
The pipeline
From inbox to verified record in one pass
Six steps end-to-end. Five are deterministic Playwright; the sixth is the recovery path with artifact capture for the failed runs the LLM diagnoses afterward.
01Trigger
Workflow row queued
A new account record lands in the workflow_items queue with credentials reference and status pending. Azure Functions picks it up.
Azure Functions
02Authenticate
Headless browser sign-in
Playwright launches a headless browser session and signs in with the stored credentials. The web UI is the only entry point — no API, no shortcut.
Playwright
03Submit
Identifier POSTed; transmissions page polled
The unique account identifier is POSTed via the form. The shared transmissions page is polled with backoff, the row matched by username and timestamp until status reads 'Accepted'.
Playwright
04Branch
Creation or update path chosen
Query whether the account is on file. Yes → update path. No → creation path with the identity-document checkbox toggled and the tri-state agency-assign set. Submit; wait for confirmation.
Playwright
05Bond
Bond identifier captured; details committed
Navigate to the account edit form. Capture the edit URL. Query the bond lookup page to extract the bond identifier. Update the company details, submit, and mark the workflow item complete.
Playwright
06Recover
Known errors auto-recovered; unknowns captured
Known error codes are recovered automatically and the flow continues. Unrecognized failures capture a screenshot, page HTML, and the transmission URL into JSONB — clean state on the next retry.
PostgreSQL + Azure Blob
Success path
New account registered in 90 seconds end-to-end
Workflow item marked complete. The new account is registered in the upstream system within 90 seconds end-to-end. The operations team gets a confirmation notification.
Failure path with full context
Artifacts captured; next retry runs against fresh state
Error artifacts captured (screenshot, HTML, transmission URL). Workflow item marked failed-with-context. The next retry runs against fresh state — artifacts are cleared at lock-time so a previous failure's stale page state doesn't contaminate the new session. Known error codes are recovered automatically without human involvement.
Why deterministic, not LLM-driven
The upstream UI is stable. Every form field has a known selector, every page transition has a predictable trigger, and the branch condition is boolean. A scripted Playwright flow runs in 90 seconds and follows the same path every time. An LLM-driven browser agent would be slower, less predictable, and more expensive for a flow where every step is already known. The LLM is reserved for the failures that need diagnosis from captured screenshots and HTML.
Validation review
Per-step success confidence
Step 5 (account number extraction) is the lowest-confidence step — it depends on a shared transmissions page that interleaves submissions across all users.
Field-level confidence
Pass 2 — Claude self-review
HighMediumLow
Identifier POSTForm submission accepted by upstream
97%High
On-file checkBoolean read from labeled status field
99%High
Registration formBranch logic + form submission
94%High
Bond queryBond identifier extracted from lookup page
91%High
Account number extractionRead from the shared transmissions page
65%Low
Routed to human review. When multiple users' submissions interleave on the same page, the row that belongs to this submission has to be disambiguated by username and timestamp. On a busy afternoon, the page may not have fully settled when the script reads. Rare misreads go to the retry queue.
4 of 5 fields cleared the 0.85 threshold
model: Per-step confidenceThe stack
Boring tech, glued together well
Each vendor handles what it's best at. Aisyst owns the orchestration layer in between.
Playwright
Deterministic browser automation across all five UI steps; selectors are stable, transitions are predictable
PostgreSQL
Workflow item queue, status tracking, error artifacts JSONB column
Drizzle ORM
Type-safe queries against the queue and audit tables
Azure Functions + Blob
Queue worker pulls pending items; Blob stores screenshot and HTML on failure for diagnosis
Third-party logos are trademarks of their respective owners and appear here only to indicate integration.
Outcomes
What changed when 'no API' stopped being a blocker
The scripted path is fast, predictable, and cheap. The LLM reads captured screenshots and HTML to tell you what went wrong — not to drive the browser on every request.
5
Deterministic steps per registration
99.2%
Success rate after one retry
2
Error codes recovered without human
90 sec
End-to-end time per registration
Watch retry rate broken out by step, not in aggregate
If step 3 retries climb from 3% to 15%, the upstream system added a new validation. If step 5 retries climb, the transmissions page layout changed. The aggregate retry rate won't tell you which step broke; the per-step breakdown will. The fix is upstream: update the step's selector or polling logic — not the retry logic.
If you log into a third-party portal manually because it has no API, this pattern fits
Drive it deterministically with Playwright and reserve the LLM for diagnosing failures. Fast, predictable, and cheap. We'll scope it on a 30-minute call.