# ClassMarker MCP by usefulapi (remote · classmarker.usefulapi.io)

Read ClassMarker groups, links, exams and recent results; manage question bank and access codes.

- Trust score: 64/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `classmarker.usefulapi.io`: 64/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-classmarker/classmarker.md), [page](https://verifymcp.io/servers/io-usefulapi-classmarker/classmarker)

## Channel facts

- Endpoint: `https://classmarker.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-17.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 80/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 2670 tokens (~178/item across 15 items; 15 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 17/100
  - Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 15 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 16 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the ClassMarker MCP by usefulapi server?

ClassMarker MCP by usefulapi is a hosted endpoint at https://classmarker.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-classmarker 'https://classmarker.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-classmarker": {
      "url": "https://classmarker.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-classmarker": {
      "type": "http",
      "url": "https://classmarker.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-classmarker]
url = "https://classmarker.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-classmarker": {
      "type": "remote",
      "url": "https://classmarker.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-classmarker --url 'https://classmarker.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-classmarker:
    url: "https://classmarker.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-classmarker": {
      "Transport": "http",
      "Url": "https://classmarker.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-classmarker -t streamable-http -u 'https://classmarker.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-classmarker": {
      "type": "http",
      "url": "https://classmarker.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-16 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-14 (score 63, +2)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional] The server now declares the “prompts” capability
- [functional] First check of Schema quality: 100
- [functional] New prompt “getting_started”
- [functional] Server version: 1.0.0 → 1.1.0

### 2026-10-13 (score 61, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-12 (score 60)

First indexed and scored.

## MCP tools (15)

### `classmarker_list_groups_links_exams` (~90 tokens)

List groups, links and exams

List the groups, links and exams (tests) this API key can access, with the ids the other tools need (group_id, link_id, link_url_id, test_id, and access_list_id for links with an access-code list). Good first call. Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1.json.

### `classmarker_recent_group_results` (~206 tokens)

Recent results across all groups

Recent finished test results taken in the key's groups (all groups, all exams), oldest first, PAGED by finish time: test-taker name, email, score, percentage, pass/fail, timing, certificate. Contains personal data: use small pages. Max look-back 3 months. Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/groups/recent_results.json.

Input parameters:

- `finished_after_timestamp` (integer): UNIX time in SECONDS: only results finished after this are returned (oldest first). Default: 14 days ago. Maximum look-back is 3 months. To page, pass next_finished_after_timestamp from the previous…
- `include_monitor_events` (boolean): Include each result's detailed monitor_events.events list (default false: only the counts).
- `limit` (integer): Results per request, 1-200 (default 25; ClassMarker's own default is 200).

### `classmarker_recent_link_results` (~215 tokens)

Recent results across all links

Recent finished test results taken through the key's links (all links, all exams), oldest first, PAGED by finish time: test-taker name, email, score, pass/fail, timing, access code, extra tracking fields, IP address, certificate. Contains personal data: use small pages. Max look-back 3 months. Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/links/recent_results.json.

Input parameters:

- `finished_after_timestamp` (integer): UNIX time in SECONDS: only results finished after this are returned (oldest first). Default: 14 days ago. Maximum look-back is 3 months. To page, pass next_finished_after_timestamp from the previous…
- `include_monitor_events` (boolean): Include each result's detailed monitor_events.events list (default false: only the counts).
- `limit` (integer): Results per request, 1-200 (default 25; ClassMarker's own default is 200).

### `classmarker_recent_group_exam_results` (~217 tokens)

Recent results for one group exam

Recent finished results for ONE exam in ONE group (ids from classmarker_list_groups_links_exams), oldest first, PAGED by finish time. Contains personal data: use small pages. Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/groups/{group_id}/tests/{test_id}/recent_results.json.

Input parameters:

- `finished_after_timestamp` (integer): UNIX time in SECONDS: only results finished after this are returned (oldest first). Default: 14 days ago. Maximum look-back is 3 months. To page, pass next_finished_after_timestamp from the previous…
- `group_id` (integer, required): The group id.
- `include_monitor_events` (boolean): Include each result's detailed monitor_events.events list (default false: only the counts).
- `limit` (integer): Results per request, 1-200 (default 25; ClassMarker's own default is 200).
- `test_id` (integer, required): The exam (test) id.

### `classmarker_recent_link_exam_results` (~218 tokens)

Recent results for one link exam

Recent finished results for the exam of ONE link (ids from classmarker_list_groups_links_exams), oldest first, PAGED by finish time. Contains personal data: use small pages. Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/links/{link_id}/tests/{test_id}/recent_results.json.

Input parameters:

- `finished_after_timestamp` (integer): UNIX time in SECONDS: only results finished after this are returned (oldest first). Default: 14 days ago. Maximum look-back is 3 months. To page, pass next_finished_after_timestamp from the previous…
- `include_monitor_events` (boolean): Include each result's detailed monitor_events.events list (default false: only the counts).
- `limit` (integer): Results per request, 1-200 (default 25; ClassMarker's own default is 200).
- `link_id` (integer, required): The link id.
- `test_id` (integer, required): The exam (test) id.

### `classmarker_list_categories` (~54 tokens)

List question categories

List the question-bank categories with their parent categories and ids (needed for creating and updating questions). Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/categories.json.

### `classmarker_list_questions` (~107 tokens)

List question-bank questions

List the questions of the question bank, 200 per page (page 1, 2, ...): question text, type, category, points, options, correct options, status. A full page means more may follow, so ask for the next page. Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/questions.json?page=N.

Input parameters:

- `page` (integer): Page number, 1-based (default 1).

### `classmarker_get_question` (~65 tokens)

Get a question

Get one question-bank question by id (ids from classmarker_list_questions). Counts as one of ClassMarker's 30 requests per hour per API key. API: GET /v1/questions/{question_id}.json.

Input parameters:

- `question_id` (integer, required): The question id.

### `classmarker_add_access_codes` (~146 tokens)

Add access codes to a list

WRITE: add access codes (1-100 per call, up to 255 characters each; a list holds at most 20,000) to a link's access-code list, so those people can start the exam. The access_list_id comes from classmarker_list_groups_links_exams (links[].access_list_id). Only adds; removing codes is not offered. Does not count against the 30 requests per hour limit. API: POST /v1/accesslists/{access_list_id}.json.

Input parameters:

- `access_list_id` (integer, required): The access list id (links[].access_list_id).
- `codes` (array, required): 1-100 access codes to add.

### `classmarker_create_parent_category` (~70 tokens)

Create a parent category

WRITE: create a new top-level question category. Returns its parent_category_id. Counts as one of ClassMarker's 30 requests per hour per API key. API: POST /v1/categories/parent_category.json.

Input parameters:

- `parent_category_name` (string, required): Name of the new parent category.

### `classmarker_update_parent_category` (~88 tokens)

Rename a parent category

WRITE: rename an existing parent category (overwrites its name). Counts as one of ClassMarker's 30 requests per hour per API key. API: PUT /v1/categories/parent_category/{parent_category_id}.json.

Input parameters:

- `parent_category_id` (integer, required): The parent category id (from classmarker_list_categories).
- `parent_category_name` (string, required): The new name.

### `classmarker_create_category` (~84 tokens)

Create a category

WRITE: create a question category under a parent category. Returns its category_id. Counts as one of ClassMarker's 30 requests per hour per API key. API: POST /v1/categories/category.json.

Input parameters:

- `category_name` (string, required): Name of the new category.
- `parent_category_id` (integer, required): The parent category id (from classmarker_list_categories).

### `classmarker_update_category` (~121 tokens)

Update a category

WRITE: rename a category and/or move it to another parent (overwrites both fields: send the name and parent_category_id you want it to have). Counts as one of ClassMarker's 30 requests per hour per API key. API: PUT /v1/categories/category/{category_id}.json.

Input parameters:

- `category_id` (integer, required): The category id (from classmarker_list_categories).
- `category_name` (string, required): The category's name (new or unchanged).
- `parent_category_id` (integer, required): The parent category id (new or unchanged).

### `classmarker_create_question` (~374 tokens)

Create a question

WRITE: add a new question to the question bank. Only multiplechoice, multipleresponse, truefalse and essay can be created. Returns the new question_id. For truefalse, give only correct_options ["A"] (True) or ["B"] (False). Counts as one of ClassMarker's 30 requests per hour per API key. API: POST /v1/questions.json.

Input parameters:

- `category_id` (integer): Category id (from classmarker_list_categories).
- `correct_feedback` (string): Feedback shown for a correct answer.
- `correct_options` (array): Letters of the correct options, e.g. ["C"]. multiplechoice: exactly one; multipleresponse: one or more; truefalse: ["A"] (True) or ["B"] (False); not allowed for essay.
- `grade_style` (string): multipleresponse only: partial credit with or without deduction, or off (all-or-nothing).
- `incorrect_feedback` (string): Feedback shown for an incorrect answer.
- `options` (object): Answer options keyed by letter A-J (up to 10), e.g. {"A": "Apply oil", "B": "Soak in water"}. Needed for multiplechoice and multipleresponse; not allowed for truefalse and essay.
- `points` (number): Points for a correct answer (for an essay: the maximum score).
- `question` (string, required): The question text.
- `question_type` (string, required): multiplechoice (one correct option), multipleresponse (one or more), truefalse, or essay (graded by hand). Free text, grammar and matching cannot be written.
- `random_answers` (boolean): Shuffle the order of the options for each test-taker (multiplechoice / multipleresponse).

### `classmarker_update_question` (~403 tokens)

Update a question

WRITE (overwrites): replace an existing question-bank question. Send the COMPLETE question (type, text, options, correct options, points, feedback), not only the changed fields; read it first with classmarker_get_question. Only multiplechoice, multipleresponse, truefalse and essay questions can be updated. Counts as one of ClassMarker's 30 requests per hour per API key. API: PUT /v1/questions/{question_id}.json.

Input parameters:

- `category_id` (integer): Category id (from classmarker_list_categories).
- `correct_feedback` (string): Feedback shown for a correct answer.
- `correct_options` (array): Letters of the correct options, e.g. ["C"]. multiplechoice: exactly one; multipleresponse: one or more; truefalse: ["A"] (True) or ["B"] (False); not allowed for essay.
- `grade_style` (string): multipleresponse only: partial credit with or without deduction, or off (all-or-nothing).
- `incorrect_feedback` (string): Feedback shown for an incorrect answer.
- `options` (object): Answer options keyed by letter A-J (up to 10), e.g. {"A": "Apply oil", "B": "Soak in water"}. Needed for multiplechoice and multipleresponse; not allowed for truefalse and essay.
- `points` (number): Points for a correct answer (for an essay: the maximum score).
- `question` (string, required): The question text.
- `question_id` (integer, required): The question id (from classmarker_list_questions).
- `question_type` (string, required): multiplechoice (one correct option), multipleresponse (one or more), truefalse, or essay (graded by hand). Free text, grammar and matching cannot be written.
- `random_answers` (boolean): Shuffle the order of the options for each test-taker (multiplechoice / multipleresponse).

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-classmarker/classmarker#diagnostics

## Score history

- 2026-10-17: 64
- 2026-10-16: 64
- 2026-10-15: 63
- 2026-10-14: 63
- 2026-10-13: 61
- 2026-10-12: 60

## Common questions

### What is the ClassMarker MCP by usefulapi server?

ClassMarker MCP by usefulapi is listed in the public MCP registry as io.usefulapi/classmarker. Read ClassMarker groups, links, exams and recent results; manage question bank and access codes. This page covers its hosted endpoint (https://classmarker.usefulapi.io/mcp).

### Is the ClassMarker MCP by usefulapi server safe to use?

ClassMarker MCP by usefulapi scores 64 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the ClassMarker MCP by usefulapi server expose?

ClassMarker MCP by usefulapi exposes 15 tools: classmarker_list_groups_links_exams, classmarker_recent_group_results, classmarker_recent_link_results, classmarker_recent_group_exam_results, classmarker_recent_link_exam_results, and 10 more. Their descriptions and schemas cost roughly 2,458 tokens of context every time the server is loaded.

### Does the ClassMarker MCP by usefulapi server require authentication?

Yes. ClassMarker MCP by usefulapi asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the ClassMarker MCP by usefulapi server still maintained?

ClassMarker MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://classmarker.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/classmarker/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-classmarker/classmarker.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-classmarker/classmarker.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-classmarker/classmarker