# MCP Tool Contract Gate (`quietrelay/mcp-tool-contract-gate`) Actor Catch consumer-breaking MCP tool contract changes before agents break. Compare HTTPS tool catalogs to a baseline and export Dataset findings, SUMMARY, SARIF, and JUnit for CI or schedules. - **URL**: https://apify.com/quietrelay/mcp-tool-contract-gate.md - **Developed by:** [quiet relay](https://apify.com/quietrelay) (community) - **Categories:** Developer tools, AI - **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks - **User rating**: No ratings yet ## Pricing from $0.05 / mcp tool comparison completed This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events. Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event ## What's an Apify Actor? Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows. In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours, and optionally produces a well-defined JSON output, datasets with results, or files in key-value store. In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server. Actors are written with capital "A". ## How to integrate an Actor? If asked about integration, you help developers integrate Actors into their projects. You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready. The best way to integrate Actors is as follows. In JavaScript/TypeScript projects, use official [JavaScript/TypeScript client](https://docs.apify.com/api/client/js/docs.md): ```bash npm install apify-client ``` In Python projects, use official [Python client library](https://docs.apify.com/api/client/python/docs.md): ```bash pip install apify-client ``` In shell scripts, use [Apify CLI](https://docs.apify.com/cli/docs.md): ````bash # MacOS / Linux curl -fsSL https://apify.com/install-cli.sh | bash # Windows irm https://apify.com/install-cli.ps1 | iex ```bash In AI frameworks, you might use the [Apify MCP server](https://docs.apify.com/integrations/mcp.md). If your project is in a different language, use the [REST API](https://docs.apify.com/api/v2.md). For usage examples, see the [API](#api) section below. For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt). # README ## MCP Tool Contract Gate Catch **consumer-breaking MCP tool contract changes** before agents and clients break. Compare a live HTTPS MCP tool catalog (tools/list-shaped JSON) against a stored baseline and emit Dataset findings plus `SUMMARY`, `SARIF`, and `JUnit` for CI or scheduled monitoring. ### What counts as breaking - Tool removed - Argument newly required - Argument removed - Incompatible JSON Schema type/format changes - Enum value removed - Narrowed numeric/string bounds - Behavioral annotation changes (`readOnlyHint`, `destructiveHint`, etc.) as warnings Description-only edits are ignored. ### Safe defaults - Only explicitly supplied **HTTPS** catalogs are fetched - No credentials in v1 - Failed downloads do not overwrite baselines - Default/demo input must stay fast and public ### Baseline modes | Mode | Behavior | |---|---| | `auto` | Create the first baseline for a `monitorId`, then compare later without overwriting | | `compareOnly` | Compare only; error if no baseline exists | | `accept` | Write reports, then replace the stored baseline | ### Pricing Pay per event: **MCP tool comparison completed** after successful report artifacts are written. Failed fetches/invalid catalogs are not charged for the comparison event. ### Authorization Only analyze tool catalogs you own or are authorized to access. Built by **Quiet Relay**. # Actor input Schema ## `toolsUrl` (type: `string`): HTTPS JSON document: MCP tools/list shape, {"tools":[...]}, or a bare tool array. ## `baselineMode` (type: `string`): Create the first baseline, explicitly accept a new one, or only compare. ## `monitorId` (type: `string`): Stable named baseline identifier. Defaults from the tools URL in auto mode. ## `baselineToolsUrl` (type: `string`): HTTPS baseline tool catalog for a one-off comparison. ## `toolAllowlist` (type: `array`): Optional tool name filter. When set, only these tools are compared. ## `failOnSeverity` (type: `string`): Highest finding severity that should fail a CI-oriented comparison. ## `requestTimeoutSecs` (type: `integer`): Maximum HTTPS tools-document request time. ## Actor input object example ```json { "toolsUrl": "https://api.apify.com/v2/key-value-stores/quietrelay~mcp-demo-fixtures/records/baseline-tools", "baselineMode": "auto", "monitorId": "mcp-demo", "failOnSeverity": "error", "requestTimeoutSecs": 20 } ```` # Actor output Schema ## `findings` (type: `string`): Individual deterministic MCP tool-contract findings. ## `summary` (type: `string`): Finding counts, provenance, hashes, and CI failure decision. ## `sarif` (type: `string`): SARIF 2.1.0 report for code-scanning and CI consumers. ## `junit` (type: `string`): JUnit XML report for build pipelines. # API You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup. ## JavaScript example ```javascript import { ApifyClient } from 'apify-client'; // Initialize the ApifyClient with your Apify API token // Replace the '' with your token const client = new ApifyClient({ token: '', }); // Prepare Actor input const input = { "toolsUrl": "https://api.apify.com/v2/key-value-stores/quietrelay~mcp-demo-fixtures/records/baseline-tools", "monitorId": "mcp-demo" }; // Run the Actor and wait for it to finish const run = await client.actor("quietrelay/mcp-tool-contract-gate").call(input); // Fetch and print Actor results from the run's dataset (if any) console.log('Results from dataset'); console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`); const { items } = await client.dataset(run.defaultDatasetId).listItems(); items.forEach((item) => { console.dir(item); }); // 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs ``` ## Python example ```python from apify_client import ApifyClient # Initialize the ApifyClient with your Apify API token # Replace '' with your token. client = ApifyClient("") # Prepare the Actor input run_input = { "toolsUrl": "https://api.apify.com/v2/key-value-stores/quietrelay~mcp-demo-fixtures/records/baseline-tools", "monitorId": "mcp-demo", } # Run the Actor and wait for it to finish run = client.actor("quietrelay/mcp-tool-contract-gate").call(run_input=run_input) # Fetch and print Actor results from the run's dataset (if there are any) print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"]) for item in client.dataset(run["defaultDatasetId"]).iterate_items(): print(item) # 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start ``` ## CLI example ```bash echo '{ "toolsUrl": "https://api.apify.com/v2/key-value-stores/quietrelay~mcp-demo-fixtures/records/baseline-tools", "monitorId": "mcp-demo" }' | apify call quietrelay/mcp-tool-contract-gate --silent --output-dataset ``` ## MCP server setup ```json { "mcpServers": { "apify": { "command": "npx", "args": [ "mcp-remote", "https://mcp.apify.com/?tools=quietrelay/mcp-tool-contract-gate", "--header", "Authorization: Bearer " ] } } } ``` ## OpenAPI specification ```json { "openapi": "3.0.1", "info": { "title": "MCP Tool Contract Gate", "description": "Catch consumer-breaking MCP tool contract changes before agents break. Compare HTTPS tool catalogs to a baseline and export Dataset findings, SUMMARY, SARIF, and JUnit for CI or schedules.", "version": "0.1", "x-build-id": "tsAPc2z1spBvitnuc" }, "servers": [ { "url": "https://api.apify.com/v2" } ], "paths": { "/acts/quietrelay~mcp-tool-contract-gate/run-sync-get-dataset-items": { "post": { "operationId": "run-sync-get-dataset-items-quietrelay-mcp-tool-contract-gate", "x-openai-isConsequential": false, "summary": "Executes an Actor, waits for its completion, and returns Actor's dataset items in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK" } } } }, "/acts/quietrelay~mcp-tool-contract-gate/runs": { "post": { "operationId": "runs-sync-quietrelay-mcp-tool-contract-gate", "x-openai-isConsequential": false, "summary": "Executes an Actor and returns information about the initiated run in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/runsResponseSchema" } } } } } } }, "/acts/quietrelay~mcp-tool-contract-gate/run-sync": { "post": { "operationId": "run-sync-quietrelay-mcp-tool-contract-gate", "x-openai-isConsequential": false, "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.", "tags": [ "Run Actor" ], "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/inputSchema" } } } }, "parameters": [ { "name": "token", "in": "query", "required": true, "schema": { "type": "string" }, "description": "Enter your Apify token here" } ], "responses": { "200": { "description": "OK" } } } } }, "components": { "schemas": { "inputSchema": { "type": "object", "required": [ "toolsUrl" ], "properties": { "toolsUrl": { "title": "Current tools catalog URL", "pattern": "^https://", "type": "string", "description": "HTTPS JSON document: MCP tools/list shape, {\"tools\":[...]}, or a bare tool array.", "default": "https://api.apify.com/v2/key-value-stores/quietrelay~mcp-demo-fixtures/records/baseline-tools" }, "baselineMode": { "title": "Baseline mode", "enum": [ "auto", "accept", "compareOnly" ], "type": "string", "description": "Create the first baseline, explicitly accept a new one, or only compare.", "default": "auto" }, "monitorId": { "title": "Monitor ID", "type": "string", "description": "Stable named baseline identifier. Defaults from the tools URL in auto mode." }, "baselineToolsUrl": { "title": "Explicit baseline tools URL", "pattern": "^https://", "type": "string", "description": "HTTPS baseline tool catalog for a one-off comparison." }, "toolAllowlist": { "title": "Tool allowlist", "type": "array", "description": "Optional tool name filter. When set, only these tools are compared.", "items": { "type": "string" } }, "failOnSeverity": { "title": "Failure threshold", "enum": [ "error", "warning", "none" ], "type": "string", "description": "Highest finding severity that should fail a CI-oriented comparison.", "default": "error" }, "requestTimeoutSecs": { "title": "Request timeout (seconds)", "minimum": 5, "maximum": 60, "type": "integer", "description": "Maximum HTTPS tools-document request time.", "default": 20 } } }, "runsResponseSchema": { "type": "object", "properties": { "data": { "type": "object", "properties": { "id": { "type": "string" }, "actId": { "type": "string" }, "userId": { "type": "string" }, "startedAt": { "type": "string", "format": "date-time", "example": "2025-01-08T00:00:00.000Z" }, "finishedAt": { "type": "string", "format": "date-time", "example": "2025-01-08T00:00:00.000Z" }, "status": { "type": "string", "example": "READY" }, "meta": { "type": "object", "properties": { "origin": { "type": "string", "example": "API" }, "userAgent": { "type": "string" } } }, "stats": { "type": "object", "properties": { "inputBodyLen": { "type": "integer", "example": 2000 }, "rebootCount": { "type": "integer", "example": 0 }, "restartCount": { "type": "integer", "example": 0 }, "resurrectCount": { "type": "integer", "example": 0 }, "computeUnits": { "type": "integer", "example": 0 } } }, "options": { "type": "object", "properties": { "build": { "type": "string", "example": "latest" }, "timeoutSecs": { "type": "integer", "example": 300 }, "memoryMbytes": { "type": "integer", "example": 1024 }, "diskMbytes": { "type": "integer", "example": 2048 } } }, "buildId": { "type": "string" }, "defaultKeyValueStoreId": { "type": "string" }, "defaultDatasetId": { "type": "string" }, "defaultRequestQueueId": { "type": "string" }, "buildNumber": { "type": "string", "example": "1.0.0" }, "containerUrl": { "type": "string" }, "usage": { "type": "object", "properties": { "ACTOR_COMPUTE_UNITS": { "type": "integer", "example": 0 }, "DATASET_READS": { "type": "integer", "example": 0 }, "DATASET_WRITES": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_READS": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_WRITES": { "type": "integer", "example": 1 }, "KEY_VALUE_STORE_LISTS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_READS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_WRITES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_INTERNAL_GBYTES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_EXTERNAL_GBYTES": { "type": "integer", "example": 0 }, "PROXY_RESIDENTIAL_TRANSFER_GBYTES": { "type": "integer", "example": 0 }, "PROXY_SERPS": { "type": "integer", "example": 0 } } }, "usageTotalUsd": { "type": "number", "example": 0.00005 }, "usageUsd": { "type": "object", "properties": { "ACTOR_COMPUTE_UNITS": { "type": "integer", "example": 0 }, "DATASET_READS": { "type": "integer", "example": 0 }, "DATASET_WRITES": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_READS": { "type": "integer", "example": 0 }, "KEY_VALUE_STORE_WRITES": { "type": "number", "example": 0.00005 }, "KEY_VALUE_STORE_LISTS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_READS": { "type": "integer", "example": 0 }, "REQUEST_QUEUE_WRITES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_INTERNAL_GBYTES": { "type": "integer", "example": 0 }, "DATA_TRANSFER_EXTERNAL_GBYTES": { "type": "integer", "example": 0 }, "PROXY_RESIDENTIAL_TRANSFER_GBYTES": { "type": "integer", "example": 0 }, "PROXY_SERPS": { "type": "integer", "example": 0 } } } } } } } } } } ```