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What you can do with Classifier Dev

A zero-shot text classifier served over plain HTTP, with a CLI and an MCP server, that needs no API key or account.

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3 use cases

  • Sort a batch of texts into labels in one call

    Label short texts with plain HTTP, no key or signup, up to a thousand per request.

    View prompt
    Using the classifier.dev API from the classifier-dev repo, label each text in <input file> as bug, feature or praise by calling https://classifier.dev over plain HTTP with no key. Write the results to <output file> as CSV with the original text and the label. Verify that the number of output rows equals the number of input rows.
  • Re-check low-confidence labels with a stronger model

    Use the smart tier so answers under 0.7 confidence get a second opinion.

    View prompt
    Using the classifier-dev repo at classifier.dev, classify each item in <input file> with the smart tier for single-label work. Output a table of item, label, confidence and whether it was escalated. Verify that every escalated row has a label that was returned by the service.
  • Send a structured bug report when a label looks wrong

    Let an agent file a feedback.now report when classification breaks or misbehaves.

    View prompt
    Using the feedback.now endpoints at https://classifier.dev described in the classifier-dev repo, file one report for <describe the wrong label> with the input text and the returned label as evidence. Output the report id and the receipt status. Verify that the receipt shows the report was accepted or marked as a duplicate.

How to use Classifier Dev

  1. Check you have what it needs: A terminal with curl or another HTTP client; npm, only if you want the classify CLI; The texts you want to label and a set of label names.
  2. Open mrmps/classifier-dev on GitHub and read the README and license.
  3. Run curl https://classifier.dev/spam,not+spam/Win+a+free+iPhone to see the path form return a label.
  4. Run curl "https://classifier.dev/?labels=spam,not+spam&text=Win+a+free+iPhone" to see the same call in query form, which is easier to build in code.
  5. Run curl classifier.dev to read the plain text docs for the batch form, since the batch syntax is not shown in the README excerpt.
  6. Send your texts in batches of up to a thousand per request using the batch form from the docs, and collect each label in order. (inferred, check the README)

These steps come from our top use case, Sort a batch of texts into labels in one call, which also has a copy-paste agent prompt.

Classifier Dev alternatives · Best AI repos for Data and analytics

About this repo

Requirements

  • A terminal with curl or another HTTP client
  • npm, only if you want the classify CLI
  • The texts you want to label and a set of label names
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Questions about Classifier Dev

What is Classifier Dev?

A zero-shot text classifier served over plain HTTP, with a CLI and an MCP server, that needs no API key or account. It is an open-source project on GitHub: https://github.com/mrmps/classifier-dev.

Who is Classifier Dev for?

Useful for developers and AI agents who need to label short texts quickly without training a model or signing up for a service.

What can I do with Classifier Dev?

3 use cases so far, for example: Sort a batch of texts into labels in one call; Re-check low-confidence labels with a stronger model; Send a structured bug report when a label looks wrong. Each has steps and a copy-paste agent prompt.

What do I need to run Classifier Dev?

A terminal with curl or another HTTP client; npm, only if you want the classify CLI; The texts you want to label and a set of label names.

What are alternatives to Classifier Dev?

Other hot AI repos in Data and analytics: Kronos, DBT Charts, Brandpose, Idx, Open Lakehouse Compute Fabric.

Is Classifier Dev safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.