DATA OPS

CSV Header-Drift Sentinel that Quarantines Mismatched S3 Drop Files

Triggered when a new file lands in an S3 ingest bucket, it checks the CSV header against the expected column contract and moves any file whose headers drifted to a quarantine…

CategoryData Ops
Enginesim
Difficultybeginner
Triggerevent
Steps5
Setup~5 min

How it runs

The automated pipeline, trigger to output.

  • TriggerNew CSV file created in S3 landing bucketAWS S3
  • ActionRead CSV header row from S3AWS S3
  • LogicCompare headers to contract; branch on drift
  • ActionMove mismatched file to S3 quarantine prefixAWS S3
  • OutputAlert source owner in Slack with header diffSlack

What it does

This sentinel guards a file-drop ingestion path. Every time a partner or upstream job writes a CSV to your S3 landing bucket, it reads just the header row, compares the column names and order to the agreed contract, and lets clean files proceed. Files with renamed, missing, reordered, or extra columns are moved to a `quarantine/` prefix so the loader never ingests a misaligned file, and the owner is notified to fix the export.

When to use it

Use it for partner or vendor CSV feeds where a column rename or reordering silently shifts every value into the wrong field. Quarantine-on-drift turns a data-corruption incident into a routine bounced file.

How it works

  1. 1An S3 object-created event in the landing bucket triggers the flow.
  2. 2Read the header line of the new CSV from S3.
  3. 3Compare header names and order to the stored column contract.
  4. 4Branch: matches -> leave the file for normal loading; drift -> continue to quarantine.
  5. 5Move the offending object to the quarantine prefix in S3.
  6. 6Notify the source owner in Slack with the expected vs received headers.

Set it up

What you configure once, before turning it on.

  1. 1
    Connect AWS S3Buckets, objects, signed URLs.
  2. 2
    Connect SlackChannels, DMs, threads, mentions.
  3. 3
    Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
  4. 4
    Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
  5. 5
    Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.

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