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by longbridge
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Rust
Hybrid

Calc Indexes

calc_indexes
Read-onlyIdempotent

Calculate financial indexes for securities by providing symbols and optional index names; defaults to key metrics like PE, PB, turnover rate, and market value.

Instructions

Calculate financial indexes for symbols. Pass symbols, and optionally indexes (e.g. ["PeTtmRatio","PbRatio","LastDone","TurnoverRate"]). When indexes is omitted or empty, defaults to ["LastDone","ChangeValue","ChangeRate","Volume","PeTtmRatio","PbRatio","DividendRatioTtm","TurnoverRate","TotalMarketValue"]. Returns per-symbol index values. When Greek indexes (Delta, Gamma, Theta, Vega, Rho) are requested, they are normalized: theta is the per-day value (one day's time decay), vega is the price change per 1% change in implied volatility, and rho is the price change per 1% change in the risk-free interest rate.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
_jqNoOptional jq filter (jaq syntax) applied to this tool's JSON response before it is returned; it never changes the upstream request. One output is returned as-is, several as a JSON array, none as []. Module imports and the `env`/`debug`/`stderr` builtins are unavailable. Example: .data | map({symbol}). Omit for the full response.
indexesNoCalc indexes (optional; defaults to LastDone, ChangeValue, ChangeRate, Volume, PeTtmRatio, PbRatio, DividendRatioTtm, TurnoverRate, TotalMarketValue): LastDone, ChangeValue, ChangeRate, Volume, Turnover, YtdChangeRate, TurnoverRate, TotalMarketValue, CapitalFlow, Amplitude, VolumeRatio, PeTtmRatio, PbRatio, DividendRatioTtm, FiveDayChangeRate, TenDayChangeRate, HalfYearChangeRate, FiveMinutesChangeRate, ExpiryDate, StrikePrice, UpperStrikePrice, LowerStrikePrice, OutstandingQty, OutstandingRatio, Premium, ItmOtm, ImpliedVolatility, WarrantDelta, CallPrice, ToCallPrice, EffectiveLeverage, LeverageRatio, ConversionRatio, BalancePoint, OpenInterest, Delta, Gamma, Theta, Vega, Rho
symbolsYesSecurity symbols, e.g. ["700.HK", "AAPL.US"]. Use the canonical form — a padded code like "00700.HK" returns an empty record, not an error.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv0.12.0
    • addedInput schema / properties / _jq / description
      Added value: +"Optional jq filter (jaq syntax) applied to this tool's JSON response before it is returned; it never changes the upstream request. One output is returned as-is, several as a JSON array, none as []. Module imports and the `env`/`debug`/`stderr` builtins are unavailable. Example: .data | map({symbol}). Omit for the full response."
    • changedInput schema / properties / symbols / description
      Previous value: -"Security symbols, e.g. [\"700.HK\", \"AAPL.US\"]"New value: +"Security symbols, e.g. [\"700.HK\", \"AAPL.US\"]. Use the canonical form — a padded code like \"00700.HK\" returns an empty record, not an error."
  2. Changed1 schema field changedv0.10.6
    • addedInput schema / properties / _jq
      Added value: +{
+  "type": "string"
+}
  3. Changed1 schema field changedv0.7.1
    • removedInput schema / title
      Removed value: -"CalcIndexesParam"
  4. Changed3 schema fields changedv0.4.9
    • addedInput schema / properties / indexes / default
      Added value: +[]
    • changedInput schema / properties / indexes / description
      Previous value: -"Calc indexes: LastDone, ChangeValue, ChangeRate, Volume, Turnover, YtdChangeRate, TurnoverRate, TotalMarketValue, CapitalFlow, Amplitude, VolumeRatio, PeTtmRatio, PbRatio, DividendRatioTtm, FiveDayChangeRate, TenDayChangeRate, HalfYearChangeRate, FiveMinutesChangeRate, ExpiryDate, StrikePrice, UpperStrikePrice, LowerStrikePrice, OutstandingQty, OutstandingRatio, Premium, ItmOtm, ImpliedVolatility, WarrantDelta, CallPrice, ToCallPrice, EffectiveLeverage, LeverageRatio, ConversionRatio, BalancePoint, OpenInterest, Delta, Gamma, Theta, Vega, Rho"New value: +"Calc indexes (optional; defaults to LastDone, ChangeValue, ChangeRate, Volume, PeTtmRatio, PbRatio, DividendRatioTtm, TurnoverRate, TotalMarketValue): LastDone, ChangeValue, ChangeRate, Volume, Turnover, YtdChangeRate, TurnoverRate, TotalMarketValue, CapitalFlow, Amplitude, VolumeRatio, PeTtmRatio, PbRatio, DividendRatioTtm, FiveDayChangeRate, TenDayChangeRate, HalfYearChangeRate, FiveMinutesChangeRate, ExpiryDate, StrikePrice, UpperStrikePrice, LowerStrikePrice, OutstandingQty, OutstandingRatio, Premium, ItmOtm, ImpliedVolatility, WarrantDelta, CallPrice, ToCallPrice, EffectiveLeverage, LeverageRatio, ConversionRatio, BalancePoint, OpenInterest, Delta, Gamma, Theta, Vega, Rho"
    • changedInput schema / required
      Previous value: -[
-  "symbols",
-  "indexes"
-]New value: +[
+  "symbols"
+]
  5. Addedv0.4.5
  6. Removedv0.4.0
  7. Addedv0.3.2
  8. Removedv0.3.1
  9. First observedv0.1.12

TDQS

A4.8/5.0
Behavior5/5

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

Annotations already mark the tool as read-only, idempotent, and non-destructive, and the description adds non-obvious behavior beyond them: padded symbol codes return empty records rather than errors, and Greek indexes have precise normalization semantics. This goes well beyond what the schema or annotations convey.

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

Conciseness5/5

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

Four dense sentences cover purpose, invocation, defaults, and Greek behavior with no filler. The default list is long, but it is essential context and is placed directly after the core instruction, making the description easy to parse.

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

Completeness5/5

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

For a read-only multi-index calculator with no output schema, the description covers request construction, default behavior, edge-case symbol handling, and special index normalization. Nothing critical appears missing for an agent to invoke the tool correctly and interpret the results.

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

Parameters5/5

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

Schema coverage is 100%, but the description adds decision-relevant meaning: representative index values, the default set, the canonical symbol requirement, and the normalization of theta/vega/rho. It turns a flat list of possible parameters into semantics an agent can act on.

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

Purpose5/5

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

The opening phrase 'Calculate financial indexes for symbols' states a specific verb, resource, and target, and the example/default index lists define precisely what kind of metrics are returned. It is distinguishable from quote-like sibling tools by its focus on computed indexes and Greek normalization, even though it does not name an alternative explicitly.

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

Usage Guidelines4/5

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

The description gives concrete invocation guidance: pass symbols, optionally pass indexes, and omitting/empty indexes falls back to a documented default set. It also explains how Greek index values are normalized, but it does not explicitly state when to prefer this tool over quote, option_quote, or valuation, so it stops short of a 5.

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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