Hex

Query Hex (Atomic)

Single responsibility: execute a Hex query via MCP, poll for completion, and return results matched against the caller-provided pattern. Hex Threads take a few minutes to run — this skill owns the full create → poll → extract cycle.

Input

Receive all three from the calling core skill:

• query — the complete, self-contained prompt to send to Hex (see Prompt Construction below)
• pattern — what the target data looks like (field names, expected shape — provided by caller; do not assume)
• context — any identifying context for the query (e.g. account name, entity ID, time range)

Prompt Construction (Critical — Read Before Creating a Thread)

Hex's Threads Agent decides which tables to query and what SQL to run based entirely on your prompt. A vague prompt causes broad table exploration and significantly slower responses. A precise prompt can shave several minutes off query time.

Rules

1. Batch everything into one prompt. Include every metric and data point the caller needs in a single create_thread call. Do NOT use continue_thread to fetch additional fields — each call re-triggers the full agent pipeline and adds multiple minutes of latency. Treat continue_thread as a last resort only when a genuinely requested data point is absent from the initial response.

2. Anchor on a specific entity identifier. Always include the primary key or identifier for the entity being queried (e.g. account ID, org slug, user ID, opportunity ID). Never rely on Hex to infer the entity from a name or description alone.

3. Use exact field and table terminology. Vague terms force Hex to guess. Use the canonical column names, table names, and metric names from the caller's data model. If the caller provides known column names, include them in the prompt.

4. Specify the time window explicitly. Always state the period: "for the last 28 days", "from [start date] to today", "monthly for the last 6 months".

5. Request structured output. End every prompt with: "Return results in a structured list or table."

6. Pass raw SQL when available. When the caller provides a specific SQL query, pass it directly to create_thread — the agent will execute it as-is, which is faster than natural language exploration.

Example: Natural Language Query

"For account ID '12345': return (1) total revenue for the last 90 days, (2) number of active users this month, and (3) any plan or subscription changes in the last 30 days. Return results in a structured list."

Example: Raw SQL Query

"Run this SQL: SELECT id, name, revenue, created_at FROM `my-project.dataset.orders` WHERE account_id = '12345' AND created_at >= DATE_SUB(CURRENT_DATE(), INTERVAL 90 DAY) ORDER BY created_at DESC"

Steps

1. Create a Hex thread. Call create_thread with the fully constructed prompt. If the call fails (network error, auth error), return immediately with status: "error" and the error message.

2. Poll for completion. Call get_thread to check thread status.

   • Wait approximately 20 seconds between polls.
   • Retry up to 10 times before giving up.
   • Continue polling while status is not IDLE (i.e., still processing).
   • If still not IDLE after 10 retries, return:

     {
       "status": "timeout",
       "value": null,
       "source": "Hex",
       "raw": "Hex query did not complete after 10 polling attempts."
     }
     

3. Extract the result. Once the thread reaches IDLE, read the response content. Reason against the returned data using the caller-provided pattern to locate and extract the target value(s).

4. Use continue_thread only as a last resort. If a genuinely requested data point is completely absent from the response (not just unlabeled or formatted differently), use continue_thread once to ask for it specifically. Re-extract after. Do not use it to request additional data the caller didn't include in the original query — that is a caller-side error.

5. Return structured output. Return one of:

   • Match found:

     {
       "status": "found",
       "value": "<extracted value(s) matching the pattern>",
       "source": "Hex",
       "raw": "<full thread response for debugging>"
     }
     

   • No match:

     {
       "status": "not_found",
       "value": null,
       "source": "Hex",
       "raw": "<full thread response for debugging>"
     }
     

Constraints

• Do not hardcode data formats or field names — patterns come from the caller.
• Do not poll beyond the 10-attempt cap defined here.
• Do not return partial results as successes — if the pattern match fails, return not_found.
• Do not invoke other skills or data sources — this is a single-source primitive.
• Do not fabricate data. If Hex returns an empty or ambiguous result, return not_found with the raw output so the caller can inspect it.
• Do not use continue_thread as a standard follow-up mechanism — it is expensive and should be used at most once per query, only when a requested data point is genuinely absent from the initial response.

Guardrails

Auth and error handling

• If create_thread returns an auth error (401/403 or OAuth failure), stop immediately and return status: "error" — do not retry auth failures.
• If create_thread returns a transient error (network timeout, 5xx), retry once. If the retry also fails, return an error status.
• Never expose raw Hex API error messages to end users. Summarize the failure mode (auth, timeout, not found) without leaking internal details.

Query safety

• Do not execute write operations. Hex threads are read-only analytics queries. If a prompt implies mutation (INSERT, UPDATE, DELETE), refuse and return an error.
• Do not pass raw user input directly as the Hex prompt. Always template input into the structured format defined by the caller's query.

Rate limits

• Cap get_thread polling to 10 calls per thread. Do not poll beyond this — return status: "timeout".
• Do not chain this skill recursively. One invocation handles one query.