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bank-mcp

by elcukro

🏦 bank-mcp

Give your AI assistant secure, read-only access to your bank accounts.

npm version License: MIT CI Node.js TypeScript


Most people manage their finances by logging into bank portals, downloading CSVs, and building spreadsheets. bank-mcp eliminates that friction by letting your AI assistant query your bank accounts directly — balances, transactions, spending breakdowns — through natural conversation. It connects to real bank APIs via the Model Context Protocol so any MCP-compatible client (Claude Code, Claude Desktop, and others) can understand your finances.

  • 5 providers, 15,000+ institutions — US and European banks covered

  • Read-only by design — no write access, no transfers, no modifications

  • Works with any MCP client — Claude Code, Claude Desktop, Cursor, and more

  • Pluggable architecture — add your own provider in under 100 lines

Table of Contents

Related MCP server: Lunch Flow MCP Server

Supported Providers

Provider

Region

Institutions

Auth Method

Setup Difficulty

Enable Banking

Europe

2,000+

RSA key + session

Medium

Teller

US

7,000+

mTLS certificate

Medium

Plaid

US / CA / EU

12,000+

Client ID + secret

Easy

Tink

Europe

3,400+

OAuth2 token

Easy

Mock

Demo

None

Instant

US Banks

Supported through Plaid and Teller — covering the top 20 US institutions and thousands more:

JPMorgan Chase · Bank of America · Wells Fargo · Citibank · Capital One · U.S. Bank · PNC · Truist · Goldman Sachs · TD Bank · Citizens · Fifth Third · M&T Bank · Huntington · KeyBank · Ally · Regions · BMO · American Express · USAA

European Banks

Supported through Enable Banking and Tink — covering major banks across the EU and UK:

HSBC · BNP Paribas · Deutsche Bank · ING · Crédit Agricole · Santander · Société Générale · UniCredit · Intesa Sanpaolo · Barclays · Lloyds · BBVA · CaixaBank · Commerzbank · Rabobank · ABN AMRO · Swedbank · Handelsbanken · Nordea · PKO Bank Polski

Quick Start

1. Run the setup wizard

npx @bank-mcp/server init

The interactive wizard walks you through everything — provider selection, credentials, bank authorization, and account verification — all with a polished terminal UI:

┌  bank-mcp — Connect your bank account
│
◇  Choose your banking provider
│  Plaid / Teller / Tink / Enable Banking
│
◇  Environment
│  Sandbox / Development / Production
│
◇  Found 3 account(s) ─────────────────────────╮
│    ****1591 (Bank of America Platinum Card)   │
│    ****3588 (Bank of America My Checking)     │
│    ****2450 (Bank of America Essential Savings)│
├───────────────────────────────────────────────╯
│
└  Setup complete!

2. Add to your MCP client

At the end of setup, the wizard asks which MCP client you use and shows the exact configuration:

  • Claude Code — one command: claude mcp add bank -- npx @bank-mcp/server

  • Cursor — add to .cursor/mcp.json

  • Windsurf — add to ~/.codeium/windsurf/mcp_config.json

  • Gemini CLI — add to ~/.gemini/settings.json

  • Codex CLI — add to ~/.codex/config.json

Using a different tool? See Client Setup for all supported clients including Claude Desktop, VS Code, and Zed.

3. Try it

Ask your AI assistant about your finances in natural language:

"What's my checking account balance?"
"Show my spending by category this month"
"Find all Amazon purchases over $50"
"Compare my spending this month vs last month"

Demo Mode

Don't have bank credentials yet? Start with realistic fake data:

npx @bank-mcp/server --mock

This launches with a mock provider that generates deterministic sample accounts and transactions — perfect for testing your setup or building on top of bank-mcp before connecting real accounts.

Client Setup

bank-mcp works with any MCP-compatible client. Pick your tool below.

Claude Code

Add to .mcp.json in your project root (or ~/.claude/.mcp.json for all projects):

{
  "mcpServers": {
    "bank": {
      "command": "npx",
      "args": ["@bank-mcp/server"]
    }
  }
}

Or add via the CLI:

claude mcp add bank -- npx @bank-mcp/server

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "bank": {
      "command": "npx",
      "args": ["@bank-mcp/server"]
    }
  }
}

Config file location:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

  • Windows: %APPDATA%\Claude\claude_desktop_config.json

Cursor

Add to .cursor/mcp.json in your project root (or ~/.cursor/mcp.json globally):

{
  "mcpServers": {
    "bank": {
      "command": "npx",
      "args": ["@bank-mcp/server"]
    }
  }
}

VS Code (Copilot)

Add to .vscode/mcp.json in your workspace:

{
  "servers": {
    "bank": {
      "type": "stdio",
      "command": "npx",
      "args": ["@bank-mcp/server"]
    }
  }
}

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "bank": {
      "command": "npx",
      "args": ["@bank-mcp/server"]
    }
  }
}

OpenAI Codex CLI

Add to ~/.codex/config.toml (or .codex/config.toml in your project):

[mcp_servers.bank]
command = "npx"
args = ["@bank-mcp/server"]

Or add via the CLI:

codex mcp add bank -- npx @bank-mcp/server

Gemini CLI

Add to ~/.gemini/settings.json (or .gemini/settings.json in your project):

{
  "mcpServers": {
    "bank": {
      "command": "npx",
      "args": ["@bank-mcp/server"]
    }
  }
}

Zed

Add to your Zed settings.json:

{
  "context_servers": {
    "bank": {
      "command": {
        "path": "npx",
        "args": ["@bank-mcp/server"]
      }
    }
  }
}

Don't see your tool? bank-mcp uses standard MCP stdio transport. Any client that supports MCP stdio servers can connect using npx @bank-mcp/server as the command.

Available Tools

Tool

Description

Key Parameters

list_accounts

List all bank accounts across connections

connectionId?

list_transactions

Fetch transactions with filtering

accountId, from?, to?, minAmount?, maxAmount?

search_transactions

Full-text search on descriptions and merchants

query, accountId?, from?, to?

get_balance

Current and available balances

accountId, connectionId?

spending_summary

Expenses grouped by merchant or category

accountId, from?, to?, groupBy?

Screenshots

All examples below use Claude Code with the mock provider (npx @bank-mcp/server --mock).

Listing accounts"List my bank accounts"

Listing bank accounts

Checking balances"What's my current balance?"

Account balances

Transaction history"Show my transactions from the last 15 days"

Recent transactions with spending breakdown

Searching transactions"Find all Starbucks purchases in last 2 weeks"

Finding Starbucks purchases

Spending by category"Show my spending by category this month"

Category breakdown with chart

Top merchants"Which merchants am I spending the most at?"

Merchant spending breakdown

Subscription tracking"Show my recurring subscriptions"

Recurring subscription analysis

Grocery comparison"Compare Trader Joe's vs Whole Foods spending"

Trader Joe's vs Whole Foods analysis

Full financial picture"Give me my full February financial picture"

Monthly income, expenses, and savings

Architecture

File Structure

~/.bank-mcp/
  config.json          # Connections & credentials (permissions: 600)
  keys/                # RSA keys and certificates

src/
  providers/
    base.ts            # Abstract BankProvider class
    registry.ts        # Provider registration
    enable-banking/    # PSD2 via Enable Banking API
    teller/            # US banks via mTLS
    plaid/             # US/CA/EU via Plaid API
    tink/              # EU Open Banking via Tink API
    mock/              # Deterministic fake data
  tools/               # MCP tool implementations
  utils/
    cache.ts           # In-memory TTL cache
    http.ts            # Fetch with timeout + retry

Provider Interface

Every provider extends the same abstract class, making it straightforward to add new integrations:

abstract class BankProvider {
  abstract listAccounts(config): Promise<BankAccount[]>;
  abstract listTransactions(config, accountId, filter?): Promise<Transaction[]>;
  abstract getBalance(config, accountId): Promise<Balance[]>;
  abstract getConfigSchema(): ConfigField[];
}

Provider Setup Guides

Enable Banking (PSD2)

What you need:

  • An Enable Banking account with a registered app

  • Your RSA private key (.pem file, downloaded when you created the app)

npx @bank-mcp/server init
# Select: Enable Banking → enter App ID + key path
# Pick your country → select your bank
# Log in at your bank → paste the redirect URL
# → Session created, accounts verified!

Tip: The wizard handles the entire OAuth flow — redirect URI setup, bank selection, and session creation. Sessions expire after 90 days (PSD2 regulation); re-run init to refresh.

Teller (US Banks)

What you need:

  • A Teller developer account

  • Your Application ID (from the Teller dashboard)

npx @bank-mcp/server init
# Select: Teller → enter Application ID
# Pick environment (sandbox for testing)
# → Teller Connect opens in your browser
# → Link your bank, token captured automatically!

Tip: Start with sandbox — no certificates needed, instant test data. For development/production, the wizard prompts for mTLS certificate paths. Free tier supports up to 100 live connections.

Plaid (US/CA/EU)

What you need:

npx @bank-mcp/server init
# Select: Plaid → enter client ID + secret
# Pick environment (sandbox for testing)
# → Sandbox: token created automatically!
# → Dev/Prod: paste an existing access token

Tip: Start with sandbox — the wizard auto-creates a test token, no browser needed. Plaid provides the richest transaction categorization — 104 sub-categories with confidence scores — ideal for LLM-driven spending analysis.

Tink (EU Open Banking)

What you need:

  • A Tink developer account (free for testing)

  • Your Client ID and Client Secret (from the Tink Console)

npx @bank-mcp/server init
# Select: Tink → enter Client ID + Secret
# Pick your market (country)
# → Tink Link opens in your browser
# → Connect your bank, paste redirect URL

Tip: Tink covers 3,400+ banks across Europe. For sandbox, use Demo Bank with test credentials (shown in the wizard). Transactions include PFM categories with merchant enrichment.

Caching

All data is cached in-memory (no disk persistence — cache dies with the process):

Data

TTL

Why

Account list

1 hour

Accounts rarely change; minimizes API calls

Transactions

15 minutes

Balances new transactions vs freshness

Balances

5 minutes

Most time-sensitive; users expect current data

Cache is per-connection and per-account. Restarting the server clears all caches.

Multiple Connections

Configure as many bank connections as you need — even across different providers:

{
  "connections": [
    { "id": "ing-main", "provider": "enable-banking", "..." : "..." },
    { "id": "chase-checking", "provider": "plaid", "..." : "..." },
    { "id": "revolut", "provider": "tink", "..." : "..." }
  ]
}

All tools accept an optional connectionId parameter to target a specific connection. When omitted, every connection is queried and results are merged — so "show all my balances" works across banks automatically.

Security

Design Principles

bank-mcp handles sensitive financial credentials. Its security posture is built on minimizing attack surface:

  • Read-only by design — the BankProvider interface exposes only read methods (listAccounts, listTransactions, getBalance). There are no write methods — no transfers, no account modifications, no payment initiation. This is enforced at the type level, not by convention.

  • No network listener — bank-mcp runs as a stdio process (stdin/stdout), not an HTTP server. There is no open port, no attack surface from the network.

  • Minimal dependencies — only 4 runtime dependencies (@modelcontextprotocol/sdk, @clack/prompts, jsonwebtoken, zod). Fewer dependencies means fewer supply chain risks.

  • Open source — every line is auditable. No obfuscated code, no compiled blobs, no telemetry.

Credential Storage

  • Config file at ~/.bank-mcp/config.json is created with 600 permissions (owner read/write only)

  • RSA keys and certificates are stored in ~/.bank-mcp/keys/ with the same restrictive permissions

  • Credentials are never logged — the server sanitizes config objects before any debug output

  • No credential caching beyond the process lifetime — when the server stops, credentials exist only on disk

Data Flow

Your Bank's API ← HTTPS → bank-mcp (local process) ← stdio → MCP Client (local)
  • Transaction data flows directly from your bank's API to your local MCP client

  • Nothing is stored remotely — no cloud relay, no proxy server, no intermediate storage

  • No telemetry — zero analytics, no crash reports, no usage tracking, no phone-home

  • In-memory cache is per-process and dies when the server stops

What Your MCP Client Sees

The MCP client (Claude, Cursor, etc.) receives structured tool results containing:

  • Account names, types, and balances

  • Transaction descriptions, amounts, dates, and categories

  • Spending summaries

The LLM processes this in its context window. Be aware that cloud-hosted LLMs send your conversation (including tool results) to their servers. If this is a concern, use a local model or review your provider's data retention policy.

Recommendations

  • Rotate tokens — if your banking provider supports token rotation, enable it

  • Use sandbox first — test your setup with mock data or Plaid sandbox before connecting live accounts

  • Review permissions — ensure ~/.bank-mcp/ is not world-readable (ls -la ~/.bank-mcp/)

  • Scope access — if your provider supports it, request the minimum scopes needed (read-only account and transaction access)

Reporting Vulnerabilities

If you discover a security issue, please email the maintainer directly rather than opening a public issue. See CONTRIBUTING.md for contact details.

Adding a New Provider

The pluggable architecture makes it straightforward to add support for additional banking APIs:

  1. Create your provider at src/providers/your-provider/index.ts

  2. Extend BankProvider — implement listAccounts, listTransactions, getBalance, and getConfigSchema

  3. Register it in src/providers/registry.ts

  4. Add an init flow at src/init/flows/your-provider.ts — interactive setup using @clack/prompts

See src/providers/enable-banking/ as a reference implementation. The mock provider at src/providers/mock/ is also useful for understanding the expected data shapes.

Troubleshooting

npx is running an old version

npx caches packages. Force the latest:

npx @bank-mcp/server@latest

"Permission denied" reading config

The config file should be readable by your user:

ls -la ~/.bank-mcp/config.json
# Should show: -rw------- (600)
# Fix: chmod 600 ~/.bank-mcp/config.json

"Session expired" (Enable Banking)

PSD2 sessions expire after 90 days. Re-run the init wizard:

npx @bank-mcp/server init
# Select your existing Enable Banking connection to update the session

Tools not showing up in your MCP client

  1. Verify the server starts: npx @bank-mcp/server --mock (should output MCP protocol on stdout)

  2. Check your config file path matches your client's expected location

  3. Restart your MCP client after adding the config

  4. Check your client's MCP logs for connection errors

"ETLS" or certificate errors (Teller)

Teller requires mTLS. Verify your certificate files:

ls -la ~/.bank-mcp/keys/teller/
# Should contain: certificate.pem, private_key.pem
# Both should be chmod 600

Development

git clone https://github.com/elcukro/bank-mcp.git
cd bank-mcp
npm install
npm test          # Run tests (vitest)
npm run build     # Compile TypeScript
npm run dev       # Watch mode (recompile on change)
npm run lint      # ESLint

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

If you're adding a new provider, open an issue first to discuss the approach — we want to make sure the integration fits the project's architecture.

License

MIT — use it however you want.


Available Tools

5 tools
get_balanceA

Get current account balance(s). Returns closing booked balance and expected balance when available.

ParametersJSON Schema
NameRequiredDescriptionDefault
connectionIdNo
accountIdNoAccount UID. If omitted, returns balances for all accounts.

TDQS

A3.6/5.0
Behavior3/5

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

With no annotations, the description must fully disclose behavior. It does mention the return types ('closing booked balance' and 'expected balance'), which is helpful, but it does not address whether the tool is read-only, if it requires authentication (implicit via connectionId), or any side effects.

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?

The description is two sentences, no redundant words, and directly addresses the tool's purpose and output. Every sentence adds value.

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

Completeness4/5

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

For a simple balance retrieval tool with two parameters and no output schema, the description is mostly complete. It covers the output type and the optionality of accountId. However, it could clarify terms like 'closing booked balance' and 'expected balance' for better clarity.

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 50% (only accountId has a description). The description for accountId adds useful context: 'If omitted, returns balances for all accounts.' However, connectionId lacks a description in both schema and tool description, leaving its meaning unclear.

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 description clearly states the verb 'Get' and the resource 'current account balance(s)', and specifies that it returns 'closing booked balance and expected balance'. This distinguishes it from sibling tools like list_accounts or list_transactions, which deal with other account data.

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?

No guidance is provided on when to use this tool versus alternatives. There is no mention of prerequisites, when to prefer get_balance over list_accounts or spending_summary, or any exclusions.

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

list_accountsB

List all bank accounts across configured connections. Returns account UIDs, IBANs, names, and currencies.

ParametersJSON Schema
NameRequiredDescriptionDefault
connectionIdNoConnection ID to query. If omitted, queries all connections.

TDQS

B3.3/5.0
Behavior2/5

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

No annotations exist, so the description must cover behavioral traits. It does not mention that this is a read-only operation, nor any potential performance considerations, rate limits, or required permissions.

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?

Two short sentences: one describing the action and scope, one describing the output. No redundant information, efficient and front-loaded.

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 simple list tool with no output schema and no annotations, the description is adequate but lacks usage guidelines and behavioral context. It covers the basic purpose and return fields but not when or how to use effectively.

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?

The schema covers 100% of the single parameter with a clear description. The tool description adds no additional semantics beyond stating it lists accounts, so baseline score of 3 is appropriate.

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 description clearly states the tool lists all bank accounts across configured connections and specifies the returned fields (UIDs, IBANs, names, currencies). It distinguishes from siblings like get_balance or list_transactions by focusing on account listing.

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?

No guidance on when to use this tool versus alternatives (e.g., get_balance for a single account). No explicit conditions or prerequisites provided.

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

list_transactionsB

List bank transactions with optional filters. Defaults to last 90 days. Supports date range, amount range, and debit/credit type filtering.

ParametersJSON Schema
NameRequiredDescriptionDefault
connectionIdNoConnection ID. If omitted, queries all connections.
accountIdNoAccount UID. If omitted, queries all accounts.
dateFromNoStart date (YYYY-MM-DD). Defaults to 90 days ago.
dateToNoEnd date (YYYY-MM-DD). Defaults to today.
amountMinNoMinimum absolute amount.
amountMaxNoMaximum absolute amount.
typeNoFilter by transaction type.
limitNoMaximum number of transactions to return.

TDQS

B3.3/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It discloses default date range and optional filters, but does not state that the operation is read-only, nor mention pagination, rate limits, or any side effects. This is a significant gap for a tool with 8 parameters.

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?

Two sentences, front-loaded with the primary action and resource. Every sentence adds value: first states purpose and filters, second gives default behavior. No waste.

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 list tool with 8 parameters and no output schema, the description covers defaults and filter types, but does not explain return value, pagination behavior, or typical usage scenarios. Schema descriptions fill some gaps, but overall completeness is adequate but not thorough.

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 baseline is 3. The description adds little beyond the schema – it mentions 'debit/credit type filtering' which is already in the enum, and 'amount range' which is covered by 'amountMin' and 'amountMax'. No new semantic insight.

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?

The description clearly states the tool lists bank transactions with optional filters. It is a specific verb-resource pairing. However, it does not differentiate from sibling 'search_transactions', which may have overlapping functionality.

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

Usage Guidelines3/5

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

The description implies usage for listing transactions with filters and mentions a default 90-day window, but lacks explicit guidance on when to use this tool versus alternatives like 'search_transactions' or 'spending_summary'. No exclusions are stated.

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

search_transactionsA

Full-text search across transaction descriptions, merchant names, and references. Use for finding specific payments or payees.

ParametersJSON Schema
NameRequiredDescriptionDefault
queryYesSearch text — matched against description, merchant name, and reference.
connectionIdNo
dateFromNo
dateToNo
limitNoMax results. Default 50.

TDQS

A3.5/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden. It describes the search operation but does not disclose whether it is read-only, any performance implications, pagination behavior, or error handling. The word 'search' implies read but is not explicit.

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?

The description is two sentences long with no extraneous words. The first sentence states the action, the second provides usage context. Every word earns its place.

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

Completeness2/5

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

The tool has 5 parameters (1 required) and no output schema. While the purpose is clear, the description fails to explain optional parameters like connectionId, dateFrom, dateTo, and does not describe return format or behavior for edge cases. This leaves gaps for effective use.

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

Parameters2/5

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

Schema description coverage is 40% (only query and limit have descriptions). The description adds semantics for query (full-text across specific fields) but does not explain connectionId, dateFrom, or dateTo. With low schema coverage, the description should compensate but does not fully.

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 description clearly states it is a 'full-text search across transaction descriptions, merchant names, and references' with a specific use case of 'finding specific payments or payees'. This distinctly separates it from sibling tools like list_transactions which likely list all transactions without search.

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 indicates when to use the tool ('for finding specific payments or payees') but does not explicitly mention when not to use it or compare to alternatives like list_transactions. The guidance is clear but lacks explicit exclusionary context.

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

spending_summaryC

Group expenses by merchant or category with totals. Shows where money is being spent. Use groupBy "merchant" for vendor breakdown, "category" for category breakdown.

ParametersJSON Schema
NameRequiredDescriptionDefault
connectionIdNo
dateFromNo
dateToNo
groupByNoGroup expenses by "merchant" (default) or "category".
limitNoMax groups to return (default 20, sorted by total spent).

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries full responsibility. It mentions grouping and totals but omits critical behavioral details such as the ability to filter by date range (dateFrom, dateTo) and the default limit and sorting behavior, which are only present in the schema.

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?

The description is brief, with three clear sentences that front-load the purpose. It avoids unnecessary detail and is easy to parse, though it could be slightly more structured.

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

Completeness2/5

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

Given five parameters and no output schema, the description omits important context such as the meaning of dateFrom/dateTo for filtering and the default limit of 20. It also lacks any hint of the return format beyond 'totals', making it incomplete for an agent to use effectively.

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

Parameters2/5

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

The description adds minimal value beyond the input schema: it reiterates the groupBy options but does not explain the purpose of connectionId, dateFrom, dateTo, or limit beyond what the schema already provides. With 40% schema coverage, the description should compensate more.

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?

The description clearly states the tool groups expenses by merchant or category with totals, showing where money is spent. It distinguishes from sibling tools like list_transactions and get_balance by focusing on aggregation rather than raw data or balances.

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

Usage Guidelines3/5

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

The description suggests when to use each groupBy option but does not provide explicit guidance on when to use this tool versus alternatives like search_transactions or list_transactions. The context is implied but not directly contrasted.

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

TDQS

A3.6/5.0
Disambiguation5/5

Each tool has a clearly distinct purpose: get_balance for balances, list_accounts for account listing, list_transactions for filtered transaction lists, search_transactions for full-text search, spending_summary for aggregation. No overlap.

Naming Consistency5/5

All tool names use a consistent snake_case verb_noun or descriptive pattern (get_balance, list_accounts, list_transactions, search_transactions, spending_summary). No mixing of conventions.

Tool Count5/5

5 tools is well-scoped for a banking data retrieval server. Each tool covers a core function without redundancy, and the count feels natural for the domain.

Completeness4/5

The set covers balance, accounts, transactions (with search and filters), and spending summaries. Minor gaps include no individual transaction detail endpoint, but search can retrieve specifics. Overall solid coverage for read-only banking information.

Maintenance

ActivityInactive
ResponsivenessSyncing

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