ClassMarker MCP by usefulapi
REMOTE · CLASSMARKER.USEFULAPI.IO
Read ClassMarker groups, links, exams and recent results; manage question bank and access codes.
Available components
Last scanned (10 minutes ago)
Scores higher than 46% of remote servers
Reachable. Last reached 17 Oct 2026.
Category Testing and QA
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. How we score → Why this is hard to score →
Endpoint Security78
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. View diagnostics → Pass
- HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
- The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial
Transport & Reachability0
- Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly. See how to fix → View diagnostics → Fail
Schema Quality & AI Usability80
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management17
- Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 15 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 16 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 16 Oct 26 +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.
- 14 Oct 26 +2
- The server rewrote its instructions, which are the text every model session reads security
- 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 functional
- 13 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 12 Oct 26 60
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 17 Oct 2026 · Probed https://classmarker.usefulapi.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=usefulapi.io | CN=WE1,O=Google Trust Services,C=US | 13 Sept 2026 | 12 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | d9be3287b0fde9630e825ba1f79bff3f |
| SANs: usefulapi.io, *.usefulapi.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of classmarker.usefulapi.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 57355 | 8 | Verified |
| usefulapi.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Enforced and verified
The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.
| Result | Enforced and verified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 302 |
WWW-Authenticate challenge Bearer realm="OAuth", resource_metadata="https://classmarker.usefulapi.io/.well-known/oauth-protected-resource/mcp"
Bearer realm="OAuth", resource_metadata="https://classmarker.usefulapi.io/.well-known/oauth-protected-resource/mcp"Protected resource metadata
| Document | https://classmarker.usefulapi.io/.well-known/oauth-protected-resource/mcp |
|---|---|
| Retrieved | Yes |
| Resource | https://classmarker.usefulapi.io/mcp |
| Authorisation server | https://classmarker.usefulapi.io |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://classmarker.usefulapi.io/mcp | Redirected | 302 | https://usefulapi.io/classmarker/ |
| http (plaintext) | http://classmarker.usefulapi.io/mcp | Inconclusive | 302 | http://classmarker.usefulapi.io/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
classmarker_add_access_codes Add access codes to a list ~146
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.
| Name | Type | Req | Description |
|---|---|---|---|
| access_list_id | integer | yes | The access list id (links[].access_list_id). |
| codes | array | yes | 1-100 access codes to add. |
No output schema declared.
No examples provided.
classmarker_create_category Create a category ~84
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.
| Name | Type | Req | Description |
|---|---|---|---|
| category_name | string | yes | Name of the new category. |
| parent_category_id | integer | yes | The parent category id (from classmarker_list_categories). |
No output schema declared.
No examples provided.
classmarker_create_parent_category Create a parent category ~70
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.
| Name | Type | Req | Description |
|---|---|---|---|
| parent_category_name | string | yes | Name of the new parent category. |
No output schema declared.
No examples provided.
classmarker_create_question Create a question ~374
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | The question text. |
| question_type | string | yes | 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). |
No output schema declared.
No examples provided.
classmarker_get_question Get a question ~65
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.
| Name | Type | Req | Description |
|---|---|---|---|
| question_id | integer | yes | The question id. |
No output schema declared.
No examples provided.
classmarker_list_categories List question categories ~54
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
classmarker_list_groups_links_exams List groups, links and exams ~90
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
classmarker_list_questions List question-bank questions ~107
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.
| Name | Type | Req | Description |
|---|---|---|---|
| page | integer | – | Page number, 1-based (default 1). |
No output schema declared.
No examples provided.
classmarker_recent_group_exam_results Recent results for one group exam ~217
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | 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 | yes | The exam (test) id. |
No output schema declared.
No examples provided.
classmarker_recent_group_results Recent results across all groups ~206
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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). |
No output schema declared.
No examples provided.
classmarker_recent_link_exam_results Recent results for one link exam ~218
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | The link id. |
| test_id | integer | yes | The exam (test) id. |
No output schema declared.
No examples provided.
classmarker_recent_link_results Recent results across all links ~215
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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). |
No output schema declared.
No examples provided.
classmarker_update_category Update a category ~121
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.
| Name | Type | Req | Description |
|---|---|---|---|
| category_id | integer | yes | The category id (from classmarker_list_categories). |
| category_name | string | yes | The category's name (new or unchanged). |
| parent_category_id | integer | yes | The parent category id (new or unchanged). |
No output schema declared.
No examples provided.
classmarker_update_parent_category Rename a parent category ~88
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.
| Name | Type | Req | Description |
|---|---|---|---|
| parent_category_id | integer | yes | The parent category id (from classmarker_list_categories). |
| parent_category_name | string | yes | The new name. |
No output schema declared.
No examples provided.
classmarker_update_question Update a question ~403
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | The question text. |
| question_id | integer | yes | The question id (from classmarker_list_questions). |
| question_type | string | yes | 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). |
No output schema declared.
No examples provided.
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.
remote · classmarker.usefulapi.io
claude mcp add --transport http io-usefulapi-classmarker 'https://classmarker.usefulapi.io/mcp'
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.