Arize Dataset

Arize Dataset Skill

`SPACE` — All --space flags and the ARIZE_SPACE env var accept a space name (e.g., my-workspace) or a base64 space ID (e.g., U3BhY2U6...). Find yours with ax spaces list.

Concepts

• Dataset = a versioned collection of examples used for evaluation and experimentation
• Dataset Version = a snapshot of a dataset at a point in time; updates can be in-place or create a new version
• Example = a single record in a dataset with arbitrary user-defined fields (e.g., question, answer, context)
• Space = an organizational container; datasets belong to a space

System-managed fields on examples (id, created_at, updated_at) are auto-generated by the server -- never include them in create or append payloads.

Prerequisites

Proceed directly with the task — run the ax command you need. Do NOT check versions, env vars, or profiles upfront.

If an ax command fails, troubleshoot based on the error:

• command not found or version error → see references/ax-setup.md
• 401 Unauthorized / missing API key → run ax profiles show to inspect the current profile. If the profile is missing or the API key is wrong, follow references/ax-profiles.md to create/update it. If the user doesn't have their key, direct them to https://app.arize.com/admin > API Keys
• Space unknown → run ax spaces list to pick by name, or ask the user
• Project unclear → ask the user, or run ax projects list -o json --limit 100 and present as selectable options
• Security: Never read .env files or search the filesystem for credentials. Use ax profiles for Arize credentials and ax ai-integrations for LLM provider keys. If credentials are not available through these channels, ask the user.

List Datasets: ax datasets list

Browse datasets in a space. Output goes to stdout.

ax datasets list
ax datasets list --space SPACE --limit 20
ax datasets list --cursor CURSOR_TOKEN
ax datasets list -o json

Flags

Get Dataset: ax datasets get

Quick metadata lookup -- returns dataset name, space, timestamps, and version list.

ax datasets get NAME_OR_ID
ax datasets get NAME_OR_ID -o json
ax datasets get NAME_OR_ID --space SPACE   # required when using dataset name instead of ID

Flags

Response fields

Export Dataset: ax datasets export

Download all examples to a file. Use --all for datasets larger than 500 examples (unlimited bulk export).

ax datasets export NAME_OR_ID
# -> dataset_abc123_20260305_141500/examples.json

ax datasets export NAME_OR_ID --all
ax datasets export NAME_OR_ID --version-id VERSION_ID
ax datasets export NAME_OR_ID --output-dir ./data
ax datasets export NAME_OR_ID --stdout
ax datasets export NAME_OR_ID --stdout | jq '.[0]'
ax datasets export NAME_OR_ID --space SPACE   # required when using dataset name instead of ID

Flags

Agent auto-escalation rule: If an export returns exactly 500 examples, the result is likely truncated — re-run with --all to get the full dataset.

Export completeness verification: After exporting, confirm the row count matches what the server reports:

# Get the server-reported count from dataset metadata
ax datasets get DATASET_NAME --space SPACE -o json | jq '.versions[-1] | {version: .id, examples: .example_count}'

# Compare to what was exported
jq 'length' dataset_*/examples.json

# If counts differ, re-export with --all

Output is a JSON array of example objects. Each example has system fields (id, created_at, updated_at) plus all user-defined fields:

[
  {
    "id": "ex_001",
    "created_at": "2026-01-15T10:00:00Z",
    "updated_at": "2026-01-15T10:00:00Z",
    "question": "What is 2+2?",
    "answer": "4",
    "topic": "math"
  }
]

Create Dataset: ax datasets create

Create a new dataset from a data file.

ax datasets create --name "My Dataset" --space SPACE --file data.csv
ax datasets create --name "My Dataset" --space SPACE --file data.json
ax datasets create --name "My Dataset" --space SPACE --file data.jsonl
ax datasets create --name "My Dataset" --space SPACE --file data.parquet

Flags

Passing data via stdin

Use --file - to pipe data directly — no temp file needed:

echo '[{"question": "What is 2+2?", "answer": "4"}]' | ax datasets create --name "my-dataset" --space SPACE --file -

# Or with a heredoc
ax datasets create --name "my-dataset" --space SPACE --file - << 'EOF'
[{"question": "What is 2+2?", "answer": "4"}]
EOF

To add rows to an existing dataset, use ax datasets append --json '[...]' instead — no file needed.

Supported file formats

Format gotchas:

• CSV: Loses type information — dates become strings, null becomes empty string. Use JSON/Parquet to preserve types.
• JSONL: Each line is a separate JSON object. A JSON array ([{...}, {...}]) in a .jsonl file will fail — use .json extension instead.
• Parquet: Preserves column types. Requires pandas/pyarrow to read locally: pd.read_parquet("examples.parquet").

Append Examples: ax datasets append

Add examples to an existing dataset. Two input modes -- use whichever fits.

Inline JSON (agent-friendly)

Generate the payload directly -- no temp files needed:

ax datasets append DATASET_NAME --space SPACE --json '[{"question": "What is 2+2?", "answer": "4"}]'

ax datasets append DATASET_NAME --space SPACE --json '[
  {"question": "What is gravity?", "answer": "A fundamental force..."},
  {"question": "What is light?", "answer": "Electromagnetic radiation..."}
]'

From a file

ax datasets append DATASET_NAME --space SPACE --file new_examples.csv
ax datasets append DATASET_NAME --space SPACE --file additions.json

To a specific version

ax datasets append DATASET_NAME --space SPACE --json '[{"q": "..."}]' --version-id VERSION_ID

Flags

Exactly one of --json or --file is required.

Validation

• Each example must be a JSON object with at least one user-defined field
• Maximum 100,000 examples per request

Schema validation before append: If the dataset already has examples, inspect its schema before appending to avoid silent field mismatches:

# Check existing field names in the dataset
ax datasets export DATASET_NAME --space SPACE --stdout | jq '.[0] | keys'

# Verify your new data has matching field names
echo '[{"question": "..."}]' | jq '.[0] | keys'

# Both outputs should show the same user-defined fields

Fields are free-form: extra fields in new examples are added, and missing fields become null. However, typos in field names (e.g., queston vs question) create new columns silently -- verify spelling before appending.

Delete Dataset: ax datasets delete

ax datasets delete NAME_OR_ID
ax datasets delete NAME_OR_ID --space SPACE   # required when using dataset name instead of ID
ax datasets delete NAME_OR_ID --force   # skip confirmation prompt

Flags

Workflows

Find a dataset by name

All dataset commands accept a name or ID directly. You can pass a dataset name as the positional argument (add --space SPACE when not using an ID):

# Use name directly
ax datasets get "eval-set-v1" --space SPACE
ax datasets export "eval-set-v1" --space SPACE

# Or resolve name to ID via list if you need the base64 ID
ax datasets list -o json | jq '.[] | select(.name == "eval-set-v1") | .id'

Create a dataset from file for evaluation

1. Prepare a CSV/JSON/Parquet file with your evaluation columns (e.g., input, expected_output)

• If generating data inline, pipe it via stdin using --file - (see the Create Dataset section)

2. ax datasets create --name "eval-set-v1" --space SPACE --file eval_data.csv 3. Verify: ax datasets get DATASET_NAME --space SPACE 4. Use the dataset name to run experiments

Add examples to an existing dataset

# Find the dataset
ax datasets list --space SPACE

# Append inline or from a file using the dataset name (see Append Examples section for full syntax)
ax datasets append DATASET_NAME --space SPACE --json '[{"question": "...", "answer": "..."}]'
ax datasets append DATASET_NAME --space SPACE --file additional_examples.csv

Download dataset for offline analysis

1. ax datasets list --space SPACE -- find the dataset name 2. ax datasets export DATASET_NAME --space SPACE -- download to file 3. Parse the JSON: jq '.[] | .question' dataset_*/examples.json

Export a specific version

# List versions
ax datasets get DATASET_NAME --space SPACE -o json | jq '.versions'

# Export that version
ax datasets export DATASET_NAME --space SPACE --version-id VERSION_ID

Iterate on a dataset

1. Export current version: ax datasets export DATASET_NAME --space SPACE 2. Modify the examples locally 3. Append new rows: ax datasets append DATASET_NAME --space SPACE --file new_rows.csv 4. Or create a fresh version: ax datasets create --name "eval-set-v2" --space SPACE --file updated_data.json

Pipe export to other tools

# Count examples
ax datasets export DATASET_NAME --space SPACE --stdout | jq 'length'

# Extract a single field
ax datasets export DATASET_NAME --space SPACE --stdout | jq '.[].question'

# Convert to CSV with jq
ax datasets export DATASET_NAME --space SPACE --stdout | jq -r '.[] | [.question, .answer] | @csv'

Dataset Example Schema

Examples are free-form JSON objects. There is no fixed schema -- columns are whatever fields you provide. System-managed fields are added by the server:

Related Skills

• arize-trace: Export production spans to understand what data to put in datasets → use arize-trace
• arize-experiment: Run evaluations against this dataset → next step is arize-experiment
• arize-prompt-optimization: Use dataset + experiment results to improve prompts → use arize-prompt-optimization

Troubleshooting

Save Credentials for Future Use

See references/ax-profiles.md § Save Credentials for Future Use.

ax Profile Setup

Consult this when authentication fails (401, missing profile, missing API key). Do NOT run these checks proactively.

Use this when there is no profile, or a profile has incorrect settings (wrong API key, wrong region, etc.).

1. Inspect the current state

ax profiles show

Look at the output to understand what's configured:

• API Key: (not set) or missing → key needs to be created/updated
• No profile output or "No profiles found" → no profile exists yet
• Connected but getting 401 Unauthorized → key is wrong or expired
• Connected but wrong endpoint/region → region needs to be updated

2. Fix a misconfigured profile

If a profile exists but one or more settings are wrong, patch only what's broken.

Never pass a raw API key value as a flag. Always reference it via the ARIZE_API_KEY environment variable. If the variable is not already set in the shell, instruct the user to set it first, then run the command:

# If ARIZE_API_KEY is already exported in the shell:
ax profiles update --api-key $ARIZE_API_KEY

# Fix the region (no secret involved — safe to run directly)
ax profiles update --region us-east-1b

# Fix both at once
ax profiles update --api-key $ARIZE_API_KEY --region us-east-1b

update only changes the fields you specify — all other settings are preserved. If no profile name is given, the active profile is updated.

3. Create a new profile

If no profile exists, or if the existing profile needs to point to a completely different setup (different org, different region):

Always reference the key via `$ARIZE_API_KEY`, never inline a raw value.

# Requires ARIZE_API_KEY to be exported in the shell first
ax profiles create --api-key $ARIZE_API_KEY

# Create with a region
ax profiles create --api-key $ARIZE_API_KEY --region us-east-1b

# Create a named profile
ax profiles create work --api-key $ARIZE_API_KEY --region us-east-1b

To use a named profile with any ax command, add -p NAME:

ax spans export PROJECT -p work

4. Getting the API key

Never ask the user to paste their API key into the chat. Never log, echo, or display an API key value.

If ARIZE_API_KEY is not already set, instruct the user to export it in their shell:

export ARIZE_API_KEY="..."   # user pastes their key here in their own terminal

They can find their key at https://app.arize.com/admin > API Keys. Recommend they create a scoped service key (not a personal user key) — service keys are not tied to an individual account and are safer for programmatic use. Keys are space-scoped — make sure they copy the key for the correct space.

Once the user confirms the variable is set, proceed with ax profiles create --api-key $ARIZE_API_KEY or ax profiles update --api-key $ARIZE_API_KEY as described above.

5. Verify

After any create or update:

ax profiles show

Confirm the API key and region are correct, then retry the original command.

Space

There is no profile flag for space. Save it as an environment variable — accepts a space name (e.g., my-workspace) or a base64 space ID (e.g., U3BhY2U6...). Find yours with ax spaces list -o json.

macOS/Linux — add to ~/.zshrc or ~/.bashrc:

export ARIZE_SPACE="my-workspace"    # name or base64 ID

Then source ~/.zshrc (or restart terminal).

Windows (PowerShell):

[System.Environment]::SetEnvironmentVariable('ARIZE_SPACE', 'my-workspace', 'User')

Restart terminal for it to take effect.

Save Credentials for Future Use

At the end of the session, if the user manually provided any credentials during this conversation and those values were NOT already loaded from a saved profile or environment variable, offer to save them.

Skip this entirely if:

• The API key was already loaded from an existing profile or ARIZE_API_KEY env var
• The space was already set via ARIZE_SPACE env var
• The user only used base64 project IDs (no space was needed)

How to offer: Use AskQuestion: "Would you like to save your Arize credentials so you don't have to enter them next time?" with options "Yes, save them" / "No thanks".

If the user says yes:

1. API key — Run ax profiles show to check the current state. Then run ax profiles create --api-key $ARIZE_API_KEY or ax profiles update --api-key $ARIZE_API_KEY (the key must already be exported as an env var — never pass a raw key value).

2. Space — See the Space section above to persist it as an environment variable.

ax CLI — Troubleshooting

Consult this only when an ax command fails. Do NOT run these checks proactively.

Check version first

If ax is installed (not command not found), always run ax --version before investigating further. The version must be 0.14.0 or higher — many errors are caused by an outdated install. If the version is too old, see Version too old below.

ax: command not found

macOS/Linux: 1. Check common locations: ~/.local/bin/ax, ~/Library/Python/*/bin/ax 2. Install: uv tool install arize-ax-cli (preferred), pipx install arize-ax-cli, or pip install arize-ax-cli 3. Add to PATH if needed: export PATH="$HOME/.local/bin:$PATH"

Windows (PowerShell): 1. Check: Get-Command ax or where.exe ax 2. Common locations: %APPDATA%\Python\Scripts\ax.exe, %LOCALAPPDATA%\Programs\Python\Python*\Scripts\ax.exe 3. Install: pip install arize-ax-cli 4. Add to PATH: $env:PATH = "$env:APPDATA\Python\Scripts;$env:PATH"

Version too old (below 0.14.0)

Upgrade: uv tool install --force --reinstall arize-ax-cli, pipx upgrade arize-ax-cli, or pip install --upgrade arize-ax-cli

SSL/certificate error

• macOS: export SSL_CERT_FILE=/etc/ssl/cert.pem
• Linux: export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
• Fallback: export SSL_CERT_FILE=$(python -c "import certifi; print(certifi.where())")

Subcommand not recognized

Upgrade ax (see above) or use the closest available alternative.

Still failing

Stop and ask the user for help.