ZeroWidth
REMOTE · API.ZEROWIDTH.AI
Search, write and run work across Compass, Workbench, Caliper, Ledger, Prism and Napkin.
Available components
Last scanned (20 hours ago)
Scores higher than 61% of remote servers
Reachable. Last reached 23 Oct 2026.
Category Project Management
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 Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (workbench_flows_update). See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- 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
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability78
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 76036 tokens (~175/item across 433 items; 299 tools + 134 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 Management50
- Stability observed for 15 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage95
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 84% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- All 24 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 300 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
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.
- 23 Oct 26 0
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 22 Oct 26 +1
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 21 Oct 26 0
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 20 Oct 26 0
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 19 Oct 26 +1
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 18 Oct 26 0
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 17 Oct 26 +1
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
- 16 Oct 26 0
- This server's schema is too large to store in full, so we cannot compare its tools day to day functional
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 23 Oct 2026 · Probed https://api.zerowidth.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=api.zerowidth.ai | CN=WR3,O=Google Trust Services,C=US | 20 Sept 2026 | 19 Dec 2026 | RSA 2048 | SHA256-RSA | ef3f24a330d02ed80992778a6ead44bf |
| SANs: api.zerowidth.ai | ||||||
| CN=WR3,O=Google Trust Services,C=US (CA) | CN=GTS Root R1,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | RSA 2048 | SHA256-RSA | 7ff005a91568d63abc22861684aa4b5a |
| CN=GTS Root R1,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 19 Jun 2020 | 28 Jan 2028 | RSA 4096 | SHA256-RSA | 77bd0d6cdb36f91aea210fc4f058d30d |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of api.zerowidth.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 3799 | 8 | Verified |
| zerowidth.ai. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://api.zerowidth.ai/mcp | Verified | 200 | |
| http (plaintext) | http://api.zerowidth.ai/mcp | HTTPS enforced |
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 →
caliper_datasets_add_items ~156
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | yes | – |
| items | array | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_create ~422
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| description | string | – | – |
| items | array | yes | – |
| title | string | yes | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_delete ~142
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_generate ~627
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| count | integer | – | – |
| datasetDescription | string | – | – |
| description | string | – | – |
| disposition | string | – | – |
| expectedStyle | string | – | – |
| flowId | string | – | – |
| outputsMode | string | – | – |
| presetId | string | – | – |
| shape | string | – | – |
| title | string | yes | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_generate_items ~485
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| anchorItemId | string | – | – |
| approvalId | string | – | – |
| count | integer | – | – |
| datasetId | string | yes | – |
| description | string | – | – |
| disposition | string | – | – |
| expectedStyle | string | – | – |
| outputsMode | string | – | – |
| shape | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_get ~186
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| datasetId | string | yes | – |
| limit | integer | – | – |
| offset | integer | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_list ~68
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_remove_item ~137
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | yes | – |
| itemId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_update ~201
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | yes | – |
| description | – | – | – |
| title | string | – | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_datasets_update_item ~203
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | yes | – |
| item | object | yes | – |
| itemId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_create ~560
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | yes | – |
| description | string | – | – |
| externalLabel | string | – | – |
| flowId | string | – | – |
| flowRevisionId | string | – | – |
| flowStage | string | – | – |
| rubricId | string | yes | – |
| scenarioId | string | – | – |
| target | string | – | – |
| title | string | yes | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_delete ~112
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| evalId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_get ~152
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| evalId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_list ~82
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_run ~271
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| evalId | string | yes | – |
| label | string | – | – |
| scenarioId | – | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_runs_cancel ~193
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| evalId | string | yes | – |
| runId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_runs_get ~269
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| evalId | string | yes | – |
| items | string | – | – |
| limit | integer | – | – |
| runId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_runs_item_execution ~239
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| evalId | string | yes | – |
| runId | string | yes | – |
| runItemId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_runs_list ~154
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| evalId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_evals_update ~445
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| description | – | – | – |
| evalId | string | yes | – |
| regressionThreshold | – | – | – |
| runOnPublish | boolean | – | – |
| scenarioId | – | – | – |
| scheduleDayOfWeek | – | – | – |
| scheduleInterval | – | – | – |
| scheduleTime | – | – | – |
| scheduleTimezone | – | – | – |
| title | string | – | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_flow_performance ~174
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| flowId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_rubrics_create ~211
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| criteria | array | yes | – |
| description | string | – | – |
| title | string | yes | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_rubrics_delete ~118
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| rubricId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_rubrics_get ~123
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| rubricId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_rubrics_list ~108
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_rubrics_update ~246
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| criteria | array | – | – |
| description | – | – | – |
| rubricId | string | yes | – |
| title | string | – | – |
| visibility | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_source_feeds_list ~111
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| sourceId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_source_feeds_stop ~143
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| feedId | string | yes | – |
| sourceId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_sources_list ~129
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_sources_over_time ~198
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| days | integer | – | – |
| sourceId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_sources_to_dataset ~378
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| datasetId | string | – | – |
| day | string | – | – |
| document | string | – | – |
| errorsOnly | boolean | – | – |
| keepAdding | – | – | – |
| limit | integer | – | – |
| newDatasetName | string | – | – |
| purpose | string | yes | – |
| sourceId | string | yes | – |
| tool | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_starters_install ~120
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| slug | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_starters_list ~125
No description provided.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
caliper_traces_get ~159
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| sourceId | string | yes | – |
| traceId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
caliper_traces_list ~206
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| before | string | – | – |
| day | string | – | – |
| document | string | – | – |
| errorsOnly | boolean | – | – |
| sourceId | string | yes | – |
| tool | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
comments_create ~184
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| body | string | yes | – |
| entityId | string | yes | – |
| entityKind | string | yes | – |
| mentionedUserIds | array | – | – |
| rootId | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
comments_list ~105
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| entityId | string | yes | – |
| entityKind | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
comments_resolve ~118
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| resolved | boolean | yes | – |
| rootId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_change_effects_set ~248
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| effects | array | yes | – |
| opportunityId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_changes_upsert ~230
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| items | array | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_gaps_create ~231
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| question | string | yes | – |
| rationale | string | – | – |
| subjectId | string | – | – |
| subjectType | string | – | – |
| suggestedResolution | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_gaps_list ~148
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| status | string | – | – |
| subjectId | string | – | – |
| subjectType | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_gaps_resolve ~259
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| gapId | string | yes | – |
| resolution | string | – | – |
| status | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_gaps_update ~201
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| gapId | string | yes | – |
| question | string | – | – |
| rationale | string | – | – |
| suggestedResolution | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_inbox_list ~237
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_interview_invite ~256
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| approvalId | string | – | – |
| string | yes | – | |
| interviewId | string | yes | – |
| message | string | yes | – |
| subject | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_interview_targets ~169
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| pageId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_interviews_create ~479
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| anonymous | boolean | – | – |
| approvalId | string | – | – |
| contextPageIds | array | – | – |
| focusPrompt | string | yes | – |
| intervieweeEmail | string | – | – |
| intervieweeName | string | – | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_interviews_get ~128
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| interviewId | string | yes | – |
| workspace | string | – | – |
No output schema declared.
No examples provided.
compass_interviews_list ~131
No description provided.
| Name | Type | Req | Description |
|---|---|---|---|
| workspace | string | – | – |
No output schema declared.
No examples provided.
How do I install the ZeroWidth MCP server?
ZeroWidth is a hosted endpoint at https://api.zerowidth.ai/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 · api.zerowidth.ai
claude mcp add --transport http ai-zerowidth-zerowidth 'https://api.zerowidth.ai/mcp'
What is the ZeroWidth MCP server?
ZeroWidth is an MCP server listed in the public MCP registry as ai.zerowidth/zerowidth. Search, write and run work across Compass, Workbench, Caliper, Ledger, Prism and Napkin. This page covers its hosted endpoint (https://api.zerowidth.ai/mcp).
Is the ZeroWidth MCP server safe to use?
ZeroWidth scores 71 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.
Does the ZeroWidth MCP server require authentication?
No. We connected to ZeroWidth without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the ZeroWidth MCP server still maintained?
ZeroWidth is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.