TrueCalci

Gold valuation

gold

Read-onlyIdempotent

Calculate Gold and Silver commodity valuation, hallmarking purity adjustments (24K, 22K, 18K, 14K), statutory GST (3%), making charges, and Indian regional unit conversions (Tola, Sovereign, Sovereign/Pavan, Grams, Troy Ounces).

Input Schema

TableJSON Schema

Name	Required	Description
`as_of_date`	Yes	Civil date YYYY-MM-DD. Selects the rule pack in force on that date. Required: the engine will not assume a date.
`purity_karat`	Yes	Purity in Karats (24K pure, 22K standard jewellery 916, 18K 750, 14K 585). Required - the engine never assumes a hallmark.
`weight_grams`	Yes	Weight of gold in grams.
`rate_per_gram_24k`	Yes	Current market price of 24K gold per gram in INR (₹), as a string with exactly 2 decimal places (money is never a float).
`making_charges_percent`	No	Making charges as percentage of pure metal value.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`mode`	No
`trace`	No
`status`	No
`currency`	No
`gold_cgst`	No
`gold_sgst`	No
`total_gst`	No
`as_of_date`	No
`disclaimer`	No
`unit_input`	No
`minor_units`	No
`hallmark_fee`	No
`purity_karat`	No
`purity_ratio`	No
`weight_input`	No
`hallmark_cgst`	No
`hallmark_sgst`	No
`rule_ids_used`	No
`gold_gst_total`	No
`making_charges`	No
`raw_gold_value`	No
`weight_in_grams`	No
`hallmark_applied`	No
`is_benchmark_rate`	No
`rate_per_gram_24k`	No
`gold_taxable_value`	No
`hallmark_gst_total`	No
`making_charges_type`	No
`total_taxable_value`	No
`final_invoice_amount`	No
`making_charges_value`	No
`gold_gst_rate_percent`	No
`rate_per_gram_applied`	No
`hallmark_total_with_gst`	No
`purity_fineness_percent`	No
`effective_price_per_gram`	No
`hallmark_gst_rate_percent`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 27, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "as_of_date": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "currency": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "disclaimer": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "effective_price_per_gram": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "final_invoice_amount": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "gold_cgst": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "gold_gst_rate_percent": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "gold_gst_total": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "gold_sgst": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "gold_taxable_value": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "hallmark_applied": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "hallmark_cgst": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "hallmark_fee": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "hallmark_gst_rate_percent": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "hallmark_gst_total": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "hallmark_sgst": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "hallmark_total_with_gst": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "is_benchmark_rate": {
+      "type": [
+        "boolean",
+        "null"
+      ]
+    },
+    "making_charges": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "making_charges_type": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "making_charges_value": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "minor_units": {
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "mode": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "purity_fineness_percent": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "purity_karat": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "purity_ratio": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "rate_per_gram_24k": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "rate_per_gram_applied": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "raw_gold_value": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "rule_ids_used": {
+      "type": [
+        "array",
+        "null"
+      ]
+    },
+    "status": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "total_gst": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "total_taxable_value": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "trace": {
+      "type": [
+        "array",
+        "null"
+      ]
+    },
+    "unit_input": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "weight_in_grams": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    },
+    "weight_input": {
+      "type": [
+        "string",
+        "number",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

Changed2 schema fields changedSep 26, 2026

addedInput schema / properties / as_of_date

Added value: +{
+  "description": "Civil date YYYY-MM-DD. Selects the rule pack in force on that date. Required: the engine will not assume a date.",
+  "example": "2026-09-26",
+  "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+  "type": "string"
+}

changedInput schema / required

Previous value: -[
-  "weight_grams",
-  "rate_per_gram_24k",
-  "purity_karat"
-]New value: +[
+  "weight_grams",
+  "rate_per_gram_24k",
+  "purity_karat",
+  "as_of_date"
+]

Changed7 schema fields changedSep 26, 2026

removedInput schema / properties / purity_karat / default
```
Removed value: -22
```

changedInput schema / properties / purity_karat / description

Previous value: -"Purity in Karats (24K pure, 22K standard jewellery 916, 18K 750, 14K 585)."New value: +"Purity in Karats (24K pure, 22K standard jewellery 916, 18K 750, 14K 585). Required - the engine never assumes a hallmark."

changedInput schema / properties / rate_per_gram_24k / description

Previous value: -"Current market price of 24K gold per gram in INR (₹)."New value: +"Current market price of 24K gold per gram in INR (₹), as a string with exactly 2 decimal places (money is never a float)."

addedInput schema / properties / rate_per_gram_24k / example
```
Added value: +"7500.00"
```
addedInput schema / properties / rate_per_gram_24k / pattern
```
Added value: +"^\\d+\\.\\d{2}$"
```
changedInput schema / properties / rate_per_gram_24k / type
```
Previous value: -"number"New value: +"string"
```

changedInput schema / required

Previous value: -[
-  "weight_grams",
-  "rate_per_gram_24k"
-]New value: +[
+  "weight_grams",
+  "rate_per_gram_24k",
+  "purity_karat"
+]

AddedSep 11, 2026

TDQS

B3.2/5.0

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile is covered. The description adds context about computational behavior (statutory GST rate of 3%, supported karat levels, Indian regional units), which is useful but does not describe return format, rounding, or failure modes.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single sentence, front-loaded with the core action ('Calculate Gold and Silver commodity valuation') and then the components. Dense but efficient; each listed item carries information without padding.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a pure calculation tool with full schema coverage and an output schema, the description scopes the computation adequately. However, it advertises 'Silver commodity valuation' while the schema exposes only gold inputs (weight_grams described as gold, rate_per_gram_24k), a capability mismatch that leaves the description incomplete relative to what the tool actually accepts.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all five parameters with patterns, enum values, and defaults. The description lists the karats and units but adds no syntax or format detail beyond the schema, so the baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Calculate Gold and Silver commodity valuation') and enumerates the computation components (purity adjustments, GST, making charges, unit conversions), making the tool's scope clear. It doesn't explicitly differentiate from siblings like land_units or gst_regular, so it falls short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides no when-to-use or when-not-to-use guidance and names no alternatives. The reader must infer that this is the tool for gold/silver valuation from the description alone, which is descriptive rather than directive.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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