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156 changes: 156 additions & 0 deletions .github/actions/generate-mcp-tools/generate-tools.mjs
Original file line number Diff line number Diff line change
@@ -0,0 +1,156 @@
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { zodToJsonSchema } from "zod-to-json-schema";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const ROOT = path.resolve(__dirname, "../../..");
const README_PATH = path.join(ROOT, "README.md");
const TOOLS_DIR = path.join(ROOT, "src", "tools");

const START = "<!-- AUTO-GENERATED TOOLS START -->";
const END = "<!-- AUTO-GENERATED TOOLS END -->";

/**
* Load MCP tools
* Scans for any export that looks like an MCP tool:
* {
* name: string,
* description: string,
* parameters?: ZodSchema
* schema?: JSONSchema
* }
*/
async function loadTools() {
const files = fs
.readdirSync(TOOLS_DIR)
.filter((f) => f.endsWith(".ts") && f !== "index.ts");

const toolPromises = files.map(async (file) => {
const mod = await import(path.join(TOOLS_DIR, file));

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medium

Dynamically importing TypeScript (.ts) files directly like this makes the script dependent on the execution environment being configured with a TypeScript loader (e.g., ts-node/esm). This can make the script less portable and harder to run locally. For a more robust solution, consider transpiling the TypeScript files to JavaScript before this script runs (e.g., in a previous workflow step), and then import the resulting .js files. This removes the dependency on a specific Node.js loader configuration.


const matches = Object.values(mod).filter(
(exp) =>
exp &&
typeof exp === "object" &&
typeof exp.name === "string" &&
typeof exp.description === "string" &&
(exp.parameters || exp.schema),
);

if (matches.length === 0) {
return null;
}

if (matches.length > 1) {
console.warn(
`Warning: ${file} exports multiple MCP-like tools. Using the first one.`,
);
}

return matches[0];
});

const loadedTools = await Promise.all(toolPromises);
const tools = loadedTools.filter(Boolean);

return tools.sort((a, b) => a.name.localeCompare(b.name));
}

function renderSchema(schema) {
if (!schema) {
return "_No parameters_";
}

// If this is a Zod schema, convert it to JSON Schema
const jsonSchema =
typeof schema.safeParse === "function" ? zodToJsonSchema(schema) : schema;

const properties = jsonSchema.properties ?? {};
const required = new Set(jsonSchema.required ?? []);

if (Object.keys(properties).length === 0) {
return "_No parameters_";
}

// Check if any param has a default value to determine table columns
const hasDefaults = Object.values(properties).some(
(prop) => prop.default !== undefined,
);

// Build table header
let table = hasDefaults
? "| Parameter | Type | Required | Default | Description |\n|-----------|------|----------|---------|-------------|\n"
: "| Parameter | Type | Required | Description |\n|-----------|------|----------|-------------|\n";

// Build table rows
for (const [key, prop] of Object.entries(properties)) {
const type = Array.isArray(prop.type)
? prop.type.join(" | ")
: (prop.type ?? "unknown");

const requiredStr = required.has(key) ? "✅" : "";
const description = prop.description ?? "";
const defaultVal =
prop.default !== undefined ? JSON.stringify(prop.default) : "";

if (hasDefaults) {
table += `| \`${key}\` | ${type} | ${requiredStr} | ${defaultVal} | ${description} |\n`;
} else {
table += `| \`${key}\` | ${type} | ${requiredStr} | ${description} |\n`;
}
}

return table.trim();
}

function renderMarkdown(tools) {
let md = "";

for (const tool of tools) {
const schema = tool.parameters || tool.schema;

md += `### \`${tool.name}\`\n`;
md += `${tool.description}\n\n`;
md += `${renderSchema(schema)}\n\n`;
}

return md.trim();
}

function updateReadme({ readme, tools }) {
if (!readme.includes(START) || !readme.includes(END)) {
throw new Error("README missing AUTO-GENERATED TOOLS markers");
}

const toolsMd = renderMarkdown(tools);

return readme.replace(
new RegExp(`${START}[\\s\\S]*?${END}`, "m"),
`${START}\n\n${toolsMd}\n\n${END}`,
);
}

async function main() {
try {
const readme = fs.readFileSync(README_PATH, "utf8");
const tools = await loadTools();

if (tools.length === 0) {
console.warn("Warning: No tools found!");
}

const updated = updateReadme({ readme, tools });

fs.writeFileSync(README_PATH, updated);
console.log(`Synced ${tools.length} MCP tools to README.md`);
} catch (error) {
console.error("Error updating README:", error);
process.exit(1);
}
}

main().catch((err) => {
console.error(err);
process.exit(1);
});
Comment on lines +134 to +156

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medium

The error handling can be simplified by removing the try...catch block from within the main function and relying solely on the .catch() on the main() call. This is a common and clean pattern for handling errors in top-level async scripts and improves code readability.

Suggested change
async function main() {
try {
const readme = fs.readFileSync(README_PATH, "utf8");
const tools = await loadTools();
if (tools.length === 0) {
console.warn("Warning: No tools found!");
}
const updated = updateReadme({ readme, tools });
fs.writeFileSync(README_PATH, updated);
console.log(`Synced ${tools.length} MCP tools to README.md`);
} catch (error) {
console.error("Error updating README:", error);
process.exit(1);
}
}
main().catch((err) => {
console.error(err);
process.exit(1);
});
async function main() {
const readme = fs.readFileSync(README_PATH, "utf8");
const tools = await loadTools();
if (tools.length === 0) {
console.warn("Warning: No tools found!");
}
const updated = updateReadme({ readme, tools });
fs.writeFileSync(README_PATH, updated);
console.log(`Synced ${tools.length} MCP tools to README.md`);
}
main().catch((error) => {
console.error("Error updating README:", error);
process.exit(1);
});

47 changes: 47 additions & 0 deletions .github/workflows/sync-tools.yml
Original file line number Diff line number Diff line change
@@ -0,0 +1,47 @@
name: Sync MCP Tool Docs

on:
push:
branches:
- main

permissions:
contents: write

jobs:
sync-tools:
runs-on: ubuntu-latest

steps:
- name: Checkout repo
uses: actions/checkout@v4

- name: Setup Node
uses: actions/setup-node@v4
with:
node-version: 20

- name: Install dependencies
run: |
if [ -f pnpm-lock.yaml ]; then
corepack enable
pnpm install --frozen-lockfile
else
npm install
fi

- name: Generate MCP tool documentation
run: npx tsx .github/actions/generate-mcp-tools/generate-tools.mjs

- name: Commit README changes
run: |
if git diff --quiet; then
echo "No README changes"
exit 0
fi

git config --local user.email "action@github.com"
git config --local user.name "GitHub Action"
git add README.md
git commit -m "chore: auto-sync MCP tool documentation"
git push
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