Skip to content
Matimodocs

Tool Discovery & Filtering

Load tools, then find the ones you need by name, tag, text or definition.

Loading Tools

Section titled “Loading Tools”
import { MatimoInstance } from '@matimo/core';


const matimo = await MatimoInstance.init({
  autoDiscover: true,     // built-in tools + every installed @matimo/* package
  toolPaths: ['./tools'], // optional: your own tools
});
console.log(matimo.listTools().length); // e.g. 153 with all providers installed
from matimo import Matimo


matimo = await Matimo.init("./tools", auto_discover=True)
print(len(matimo.list_tools()))
  • autoDiscover / auto_discover loads the core tools (calculator, web, read, edit, execute, the matimo_* meta-tools, …) and the tools of every installed provider package: @matimo/* in node_modules, or matimo-* packages in the Python environment.
  • toolPaths adds directories of your own. They are scanned recursively for definition.yaml files, so tools/my-provider/my_tool/definition.yaml works.
  • A path alone (init('./tools')) loads only that directory, without the built-in tools.

Tools are read once at start-up. After installing a package, restart the process; after adding YAML files, call reloadTools() / reload().

Provider packages

Section titled “Provider packages”
Terminal window
npm install @matimo/github @matimo/slack     # TypeScript
pip install matimo-github matimo-slack       # Python

Tool names come from each package’s YAML, and the packages use both styles:

Package Example tools
@matimo/github github-create-issue, github-get-repository, github-list-repositories
@matimo/gmail gmail-send-email, gmail-list-messages, gmail-get-message
@matimo/slack slack-send-message, slack_send_channel_message, slack_get_channel_history
@matimo/microsoft ms_get_email, ms_send_email, ms_list_files

Use startsWith('slack') rather than 'slack_' or 'slack-' to catch both styles.

Get One Tool

Section titled “Get One Tool”
const tool = matimo.getTool('calculator');
if (!tool) throw new Error('calculator is not loaded');


console.log(tool.description);
console.log(Object.keys(tool.parameters ?? {})); // ['operation', 'a', 'b', 'expression', 'precision']
console.log(tool.execution.type);                // 'function'
tool = matimo.get_tool("calculator")

Search by Text

Section titled “Search by Text”

searchTools(query) matches the query against tool names, descriptions and tags:

matimo.searchTools('email').map((t) => t.name);
// ['gmail-create-draft', 'gmail-send-email', 'mailchimp-add-list-member', …, 'ms_get_email', …]
[t.name for t in matimo.search_tools("email")]

Filter by Tag

Section titled “Filter by Tag”
matimo.getToolsByTag('math').map((t) => t.name); // ['calculator']

Python has no get_tools_by_tag yet; filter the list:

math_tools = [t for t in matimo.list_tools() if "math" in (t.tags or [])]

Both searchTools and getToolsByTag accept an optional PolicyContext as a second argument and then return only the tools that caller may run.

Filter by Definition

Section titled “Filter by Definition”
const tools = matimo.listTools();


const httpTools = tools.filter((t) => t.execution.type === 'http');
const functionTools = tools.filter((t) => t.execution.type === 'function');
const oauth2Tools = tools.filter((t) => t.authentication?.type === 'oauth2');
const noAuthTools = tools.filter((t) => !t.authentication);
const needsApproval = tools.filter((t) => t.requires_approval === true);
const githubTools = tools.filter((t) => t.name.startsWith('github'));

To list the credentials a tool needs (TypeScript): matimo.getRequiredCredentials('github-create-issue') → ['GITHUB_TOKEN'].

Tool Metadata

Section titled “Tool Metadata”
const tool = matimo.getTool('github-create-issue')!;


tool.name;               // 'github-create-issue'
tool.description;        // 'Create a new issue in a repository'
tool.parameters;         // { owner, repo, title, body, … }
tool.execution;          // { type: 'http', method: 'POST', url: …, headers: …, body: … }
tool.authentication;     // { type: 'bearer', location: 'header' }
tool.requires_approval;  // true
tool.tags;               // tags from the YAML, if any

Giving an Agent the Right Tools

Section titled “Giving an Agent the Right Tools”

A model works best with a short list, and OpenAI rejects more than 128 tools. Pick by provider, tag or search before converting:

const picked = matimo.searchTools('issue').slice(0, 20);
const tools = await convertToolsToLangChain(picked, matimo);

Agents can also search for themselves with the matimo_search_tools and matimo_get_tool meta-tools, and load guidance with the skill meta-tools; see META_TOOLS.md.

Next Steps

Section titled “Next Steps”