What is iol-mcp AGENTS.md?

A project instruction file for an MCP server that connects coding agents to InvertirOnline, an online investment platform. It documents the Bun runtime, commands, code structure, API access, and temporary login-token handling.

Use it when working on authentication, portfolio data, trades, price quotes, or the server's MCP tools. It also notes that restarting the server requires logging in again and that no tests or code checks are configured.

It gives an agent the project rules and important implementation details, reducing guesswork when changing or running the server.

How ramide1/iol-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to ramide1/iol-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/ramide1/iol-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/ramide1/iol-mcp

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/ramide1/iol-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/ramide1/iol-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/ramide1/iol-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/ramide1/iol-mcp/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/ramide1/iol-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/ramide1/iol-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 607 This file is loaded in full into every session.

When invoked 607 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00607	$0.00607
Opus 5.5	$0.00243	$0.00243
Sonnet 5.5	$0.00121	$0.00121
Haiku 4.5	$0.00061	$0.00061

Measured 2mo ago against content hash d111334e53b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

iol-mcp AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

AGENTS.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

iol-mcp

MCP server for IOL (InvertirOnline) API — tools for auth, portfolio, operations, and quotes via stdio transport.

Commands

Install: bun install
Run: bun run start (runs bun src/main.ts)

No lint, typecheck, or test commands are configured. The codebase has no test infrastructure.

Architecture

Runtime: Bun (not Node.js)
Transport: stdio (not HTTP)
SDK: @modelcontextprotocol/sdk v1.29+
Entry: src/main.ts → creates McpServer, calls registerTools(), connects to stdio
API Base: https://api.invertironline.com

Single flat package, no monorepo.

Key Files

File	Role
`src/main.ts`	Entry point — server creation + stdio transport
`src/tool.ts`	All MCP tool definitions in a single `registerTools()` function
`src/tokenManager.ts`	In-memory token store (Map-based, no persistence)
`src/request.ts`	HTTP helpers with Bearer auth + maintenance error handling
`src/interface.ts`	TypeScript types for all IOL API endpoints

Token Flow

Tokens are stored in-memory only (no disk, no DB). Server restart = re-auth required.
ensureToken() (in tool.ts) tries: cached access token → refresh token → env password login.
IOL_USERNAME + IOL_PASSWORD env vars enable lazy auto-login. Without them, call get_token manually.
IOL_ENABLE_TRADING=true or =1 gates all write operations (buy/sell/cancel/subscribe/rescue/cpd/simplified).

API Gotchas

request.ts checks every response for { status: "maintenance" } and throws IOLMaintenanceError with optional retryAfter.
POST requests that return non-JSON (e.g., empty 200) yield null — callers must handle this.
Token requests use application/x-www-form-urlencoded (not JSON). All other API calls use JSON.

Style

Zod schemas for all tool input validation.
All tools are registered in one big function (registerTools in tool.ts). No per-file tool organization.
interface.ts defines response types for all IOL API endpoints (AccountStatus, Portfolio, Operation, Quote, FCI, etc.).
request.ts uses any for raw fetch() responses — this is the HTTP plumbing layer, not business logic.
Some tools use z.any() for input schemas (place_cpd, buy_simplified, advisor tools) because the API accepts flexible bodies.

Read the full file on GitHub · 52 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 52 lines · 607 tokens per session scan A d111334e53b5

Subscribe to this mod's changes

iol-mcp AGENTS.md is an instructions file published in the GitHub repository ramide1/iol-mcp (0 stars, last pushed 3mo ago), licensed MIT. It adds 607 tokens to every session, about $0.0024 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Finance and fintech bun invertironline iol mcp mcp-server

iol-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
iol-mcp AGENTS.mdramide1/iol-mcp	Instructions file	0	3mo ago	MIT	A	607	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
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vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

iol-mcp: Instructions file for Codex