Datarails Table Discovery

Explore Finance OS tables - list available tables, view schemas, and understand data structure.

Workflow

Step 1: Verify Authentication

If any Datarails tool call fails with an authentication or connection error, tell the user to click the "+" button next to the prompt, select Connectors, find Datarails, and click Connect. Then STOP.

Step 2: Handle Request

List all tables (no arguments):

• Use mcp__datarails-finance-os__list_data_models
• Each entry carries both a numeric id and an alias (empty when the table has no business alias) — note both, they drive which schema/field tools to use next
• Present tables in a formatted list with IDs, aliases, and names
• Group by category if available

View specific table (with table_id):

• If the table has an alias, use mcp__datarails-finance-os__list_aliased_fields (business-friendly field aliases); otherwise use mcp__datarails-finance-os__get_fields_by_id (capture each field's numeric id)
• For a quick data overview, run mcp__datarails-finance-os__profile_numeric_fields(table_id) (stats per numeric field) and mcp__datarails-finance-os__profile_categorical_fields(table_id, fields=[...]) — always pass an explicit fields list of business dimensions taken from the schema just fetched (account-hierarchy levels, scenario, entity/department-like, dates); called bare the tool profiles upload/mapping metadata columns, not business data. The tool caps at 5 fields per call and silently drops the rest — an explicit list longer than 5 is still truncated, so batch into calls of ≤5 and merge the results before presenting them as the table's overview
• Present schema in a readable table format

Alias coverage is per field, not per table. A table having an alias does not mean its fields are aliased — real orgs often expose only a handful of aliased fields (e.g. ~5 of ~185 on a mapped financials table), and the load-bearing fields (amount, scenario, account groups, dates) are frequently not among them. Treat the alias/by-id choice per field: get_fields_by_id(<id>) returns every field with its numeric id and its alias (empty if none). Address a field by alias (via the *_by_alias tools) when it has one, else by numeric id (via the *_by_id tools). By-id always works — never abandon the query because the aliased set is thin.

Async fetch — aggregations and distinct values run as start → poll. start_aggregation_by_id/_by_alias and start_distinct_values_by_id/_by_alias take the same arguments as the retired blocking calls (dimensions/metrics/filters; table id + field id, or alias + field alias) and return immediately with {"status": "pending", "handle": {...}}. Echo that handle back verbatim to the matching get_aggregation_result_by_* / get_distinct_values_result_by_* tool: a {"status": "running", "retry_after_seconds": N} response means poll again with the same handle after ~N seconds (≈5s) — it is not an error, and large jobs may take several polls; when ready, the result arrives in the familiar shape (for distinct values, pass limit to the result tool). An expired/unknown-handle error means restart with the start_* tool. Transitional fallback: if the start_* tools aren't available on the connector (older server), the blocking twins get_aggregated_data_by_* / get_distinct_values_by_* still work with the same arguments.

Explore field values (with --field):

• Use mcp__datarails-finance-os__start_distinct_values_by_alias (aliased tables) or mcp__datarails-finance-os__start_distinct_values_by_id (by-id fallback)
• → poll the matching get_distinct_values_result_by_alias / get_distinct_values_result_by_id with the returned handle until ready (async-fetch pattern); pass limit to the result tool
• Show unique values with counts
• Useful for understanding categorical data
• If a distinct-values call errors, fall back to sampling rows and dedupe client-side
• On "truncated": true in any data response, the returned rows are an incomplete prefix — never present the prefix as complete or sum it for a total. Aggregation responses carry exact grand totals in a top-level totals field (computed across all groups, not just the returned prefix, so it is unaffected by truncation; it combines the per-group results, so it is exact only for SUM/COUNT/MIN/MAX — never read it for AVG, COUNT_UNIQUE or UNIQUE_VALUES) — read the total there; if a truncated aggregation lacks totals (pre-rollout cache), re-run it once (a fresh run may return totals) and, if it still lacks them, narrow or chunk until complete rather than totaling the prefix; narrow the query per the guidance (more filters / fewer columns / lower limit+offset paging) and re-fetch only when the rows themselves are needed

Arguments

Argument	Description
(none)	List all available tables
<table_id>	Show schema and summary for specific table
--schema	Show detailed schema (columns, types, constraints)
--field <name>	Show distinct values for a specific field

Example Interactions

(Illustrative — table ids, names, and values below are invented; your org's tables and fields will differ.)

User: "/dr-tables"

📊 Finance OS Tables

| ID     | Name                    | Alias      |
|--------|-------------------------|------------|
| 999901 | GL Transactions         | financials |
| 999902 | Budget Data             | —          |
| 999903 | Vendor Master           | —          |
...

User: "/dr-tables 999901"

📋 Table: GL Transactions (ID: 999901)

Fields: 24 (from the schema call — row counts are not available from any tool; never invent one)

Schema:
| Column          | Type      | Nullable | Description          |
|-----------------|-----------|----------|----------------------|
| transaction_id  | INTEGER   | No       | Primary key          |
| account_code    | VARCHAR   | No       | GL account number    |
| amount          | DECIMAL   | No       | Transaction amount   |
| posting_date    | DATE      | No       | Date posted          |
...

User: "/dr-tables 999901 --field account_code"

🔍 Distinct Values: account_code (Table 999901)

Found 156 unique values:

| Value      | Count  | % of Total |
|------------|--------|------------|
| 4000-100   | 12,543 | 10.0%      |
| 4000-200   | 8,291  | 6.6%       |
| 5100-300   | 7,892  | 6.3%       |
...

Tips

• Use this skill first when starting analysis to understand available data
• Table IDs (and aliases) are needed for other skills like /dr-profile and /dr-anomalies
• Check distinct values to understand categorical field cardinality
• The numeric/categorical field profiles give a quick data quality overview

Related Skills

• Connect via Connectors UI
• /dr-profile - Deep profiling of numeric and categorical fields
• /dr-anomalies - Detect data quality issues
• /dr-query - Query specific records