Squidler MCP Server

Squidler.io

AI coding agents excel at the Build phase of a web app, but struggle with the Verify phase. Squidler is designed to validate your web app as a human based on natural language use cases, and without writing brittle, DOM-dependent tests.

Squidler is not just a testing tool; it enables your coding agent to analyze its own work from a user perspective, decoupled from the implementation. Squidler closes the autonomous Build → Verify → Fix loop, and enables you to act as the true human-in-the-loop who manages the outcome rather than the output.

Squidler MCP Server

With the Squidler MCP server you enable you AI coding agents, like Cursor, Claude Code, Replit, Lovable etc to work with Squidler. This means that you can have your coding agent build a feature, describe the use case in natural language for Squidler, ask Squidler to test it, to get the details of how the test run went, and details of all problems or friction that were found when using your web app.

Below are details and example for how to get started with Squidler via MCP. If you have any questions, don't hesitate to reach out to mattias@squidler.io.

Configuration

Add to your MCP client configuration:

{
  "mcpServers": {
    "squidler": {
      "transport": "http",
      "url": "https://mcp.squidler.io",
      "headers": {
        "Authorization": "Bearer YOUR_SQUIDLER_API_TOKEN"
      }
    }
  }
}

Get your API token from squidler.io/integrations/api-keys.

Built-in Agent Guidance

The MCP server includes built-in instructions that teach your AI agent a Test-After-Feature Workflow. When connected, the agent automatically knows how to use Squidler without you having to explain it. The workflow it follows:

1. Run existing tests — verify nothing is broken by the new feature.
2. Investigate failures — use test run outcomes and events to understand what failed. Fix the code if it's a bug, or update/delete the test if it's obsolete.
3. Label the feature — create a label for the completed feature (e.g., "User Login", "Checkout Flow") to organize your test catalog.
4. Cover the new feature — create test cases for the new behavior, tag them with the feature label, and run them to confirm they pass.
5. Confirm green — re-run until all tests pass, then move on to the next feature.

Over time this builds a growing catalog of tests organized by feature that prevents regressions and documents how the system is meant to work.

Resources

Resource URI	Description
squidler://help	Server documentation and available capabilities
squidler://sites	List of all available sites

Tools

Sites

Tool	Description
sites_list	List all available sites
site_details	Get site information (owner, URL, name, frontend link)
site_create	Create a new site

Problems

Tool	Description
problems_summary	Overview of problems (total count by type)
problems_list	List problems with pagination and filtering
problem_get	Get detailed information about a specific problem
problem_resolve	Mark a problem as resolved
problem_dismiss	Mark a problem as false positive

Test Cases

Tool	Description
test_cases_list	List all test cases
test_case_get	Get test case details
test_cases_list_by_label	List test cases with a specific label
test_case_create	Create a new test case
test_case_update	Update an existing test case
test_case_delete	Delete a test case
test_case_run	Run a single test case
test_cases_run_all	Run all test cases
test_cases_run_by_label	Run test cases with a specific label

Test Runs

Tool	Description
test_runs_list	List execution history for a test case
test_case_poll	Long-poll for test execution status updates and events
test_run_outcome	Get pass/fail outcome and goal results for a test run
test_run_events	Get detailed execution events and screenshots
test_run_stop	Stop a currently running test

Labels

Tool	Description
labels_list	List all labels
label_get	Get label details
label_create	Create a new label
label_update	Update a label
label_delete	Delete a label
test_case_labels_add	Add labels to a test case
test_case_label_remove	Remove a label from a test case

Headers

Tool	Description
headers_list	List custom headers for a site
header_add	Add or update a custom header
header_delete	Remove a custom header

Credentials

Tool	Description
credentials_list	List available login credentials
credentials_create	Create username/password credentials for site authentication
credentials_create_oidc	Create OIDC credentials for sites using OpenID Connect

Prompts

Prompt	Description
create-test-case	Guided test case creation with goals, steps, and failure strategies
site-health-check	Quick overview of site quality status with actionable recommendations
run-test-suite	Run all or labeled tests and monitor results
get-started-with-squidler	Complete onboarding: create site, generate initial tests, run them
suggest-initial-tests	Analyze codebase to suggest 2-4 initial test cases
enhance-tests-from-runs	Analyze test run events to identify and fix test weaknesses
identify-ux-improvements	Discover usability issues from AI tester friction patterns
correlate-accessibility-and-ux	Cross-reference accessibility problems with test execution friction
migrate-legacy-tests	Migrate V1 legacy test cases to V2 format

Example Prompts

What you can say	What it does
"Create a site for https://myapp.com called 'My App'"	Register your website with Squidler to start monitoring and testing
"Analyze the codebase and create test cases for the key user flows"	Analyzes your code to create comprehensive test cases covering happy flows, edge cases, and negative tests
"Run all my test cases"	Execute your test cases in a real browser with goal validation and issue detection
"Show me the results of my latest test runs"	See which goals passed or failed, and understand what happened during execution
"Get the detailed test events for test case #1 and analyze the UX"	Review execution logs to identify UX friction and usability issues
"Fix the issues preventing test case #1 from passing"	Analyzes test failures and fixes the underlying code issues
"Get problem #42 and help me fix it"	Address specific accessibility, functionality, or content issues
"Fix all accessibility issues in my site"	Batch-fix WCAG compliance issues by iterating through problems