Testers.ai CARBON Test Harness Lite
MCPB · CARBON-LITE-MCP-0.1.0.MCPB
Local QA workflows, test evidence, screenshot maps and confidence reports for AI coding agents.
Available components
Last scanned (3 hours ago)
Scores higher than 84% of MCPB servers
Category Testing and QA
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security0
- No malware scan is available for this kind of package: the supply-chain vendors we use do not cover it. This is a permanent gap in our coverage, not a finding about the package.Unverified
- Known CVEs could not be checked: we found no dependency list to check in this bundle: either it runs a compiled binary, whose bundled manifests we do not read, or none of the package.json, requirements.txt, pyproject.toml or uv.lock files it ships for its runtime declares a dependency we can read (a requirements.txt that only points at a setup.py project, a local path, or a nested requirements file we cannot follow counts as none).Unverified
- Install-script risk not yet assessed.Unverified
- Dependency health could not be checked: we found no dependency list to check in this bundle: either it runs a compiled binary, whose bundled manifests we do not read, or none of the package.json, requirements.txt, pyproject.toml or uv.lock files it ships for its runtime declares a dependency we can read (a requirements.txt that only points at a setup.py project, a local path, or a nested requirements file we cannot follow counts as none).Unverified
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 31 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
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
- Tool/resource definitions use about 510 tokens (~51/item across 10 items; 10 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage67
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 11 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
Unverified: 1 category
A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.
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.
- 3 Nov 26 0
- Stability: 0.97 → pass security
- 2 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 30 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.
- 26 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.
- 24 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.
- 22 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.
- 20 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
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 5 Nov 2026 · Analysed mcpb/https://github.com/jarbon/carbon-lite/releases/download/mcp-v0.1.0/carbon-lite-mcp-0.1.0.mcpb
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | mcpb |
| Reason | No attestation published |
Background: How many MCP packages publish verified provenance →
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 →
carbon_demo ~59
List fixtures or create a disposable copy on explicit request. Does not install dependencies, run tests or start servers.
| Name | Type | Req | Description |
|---|---|---|---|
| action | string | yes | – |
| destination | string | – | – |
| fixture | string | – | – |
| testProfile | string | – | – |
No output schema declared.
No examples provided.
carbon_feedback ~36
Import explicitly approved UI feedback. Notes remain data, not executable instructions.
| Name | Type | Req | Description |
|---|---|---|---|
| confirm | boolean | yes | – |
| feedback | object | yes | – |
No output schema declared.
No examples provided.
carbon_knowledge ~18
Read bundled testing guidance, not test evidence.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
carbon_report ~29
Regenerate portable local HTML/JSON. Return paths for host to open. No upload or browser launch.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
carbon_screenshot ~51
Attach a project-local PNG, JPEG or WebP screenshot. Never attach secrets or personal data.
| Name | Type | Req | Description |
|---|---|---|---|
| file | string | yes | – |
| pageId | string | yes | – |
| runId | string | yes | – |
No output schema declared.
No examples provided.
carbon_settings ~36
Read preferences or persist a user-requested patch using current workspace revision.
| Name | Type | Req | Description |
|---|---|---|---|
| patch | object | – | – |
| revision | integer | – | – |
No output schema declared.
No examples provided.
carbon_snapshot ~27
Read local evidence and revisions. Screenshot bytes are omitted.
| Name | Type | Req | Description |
|---|---|---|---|
| runId | string | – | – |
No output schema declared.
No examples provided.
carbon_start ~36
Start a local evidence record and HTML report. Does not execute tests.
| Name | Type | Req | Description |
|---|---|---|---|
| target | string | – | – |
| title | string | yes | – |
No output schema declared.
No examples provided.
carbon_update ~114
Record checks, findings, pages and scoped confidence. Pass/fail requires evidence. Use current run revision.
| Name | Type | Req | Description |
|---|---|---|---|
| blockers | array | – | – |
| checks | array | – | – |
| confidence | object | – | – |
| current | string | – | – |
| findings | array | – | – |
| pages | array | – | – |
| personas | array | – | – |
| revision | integer | yes | – |
| runId | string | yes | – |
| status | string | – | – |
| summary | string | – | – |
| why | string | – | – |
No output schema declared.
No examples provided.
carbon_workflow ~39
Get a Lite testing workflow for clients without prompt menus. Does not execute tests.
| Name | Type | Req | Description |
|---|---|---|---|
| command | string | – | – |
| target | string | – | – |
No output schema declared.
No examples provided.
How do I install the Testers.ai CARBON Test Harness Lite MCP server?
Testers.ai CARBON Test Harness Lite ships as an MCPB bundle, a single file you download and open in an MCP host that supports MCPB bundles, such as Claude Desktop. The host reads the launch command from the bundle's own manifest, so there is no command to copy. Before opening it, check the file's SHA-256 matches the one the MCP registry declares for it, ff16afdad518bd5a1141b199a339157fcf750853dcb1d9d8440b00e4c9cf5024; the commands to do that are on this page. If it does not match, do not open it.
mcpb · carbon-lite-mcp-0.1.0.mcpb
Download bundleCheck the download matches the SHA-256 the MCP registry declares before you open it. If it does not match, do not open the file.
SHA-256
ff16afdad518bd5a1141b199a339157fcf750853dcb1d9d8440b00e4c9cf5024
macOS / Linux
echo "ff16afdad518bd5a1141b199a339157fcf750853dcb1d9d8440b00e4c9cf5024 carbon-lite-mcp-0.1.0.mcpb" | shasum -a 256 -c
Windows (PowerShell)
(Get-FileHash -Algorithm SHA256 .\carbon-lite-mcp-0.1.0.mcpb).Hash -eq "ff16afdad518bd5a1141b199a339157fcf750853dcb1d9d8440b00e4c9cf5024"
Run it in the folder you saved the bundle to, then open the file with an MCPB-capable host such as Claude Desktop.
What is the Testers.ai CARBON Test Harness Lite MCP server?
Testers.ai CARBON Test Harness Lite is an MCP server listed in the public MCP registry as io.github.jarbon/carbon-lite. Local QA workflows, test evidence, screenshot maps and confidence reports for AI coding agents. This page covers its MCPB bundle (https://github.com/jarbon/carbon-lite/releases/download/mcp-v0.1.0/carbon-lite-mcp-0.1.0.mcpb).
Is the Testers.ai CARBON Test Harness Lite MCP server safe to use?
Testers.ai CARBON Test Harness Lite scores 52 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 Testers.ai CARBON Test Harness Lite MCP server expose?
Testers.ai CARBON Test Harness Lite exposes 10 tools: carbon_workflow, carbon_knowledge, carbon_start, carbon_snapshot, carbon_update, and 5 more. Their descriptions and schemas cost roughly 445 tokens of context every time the server is loaded.
What licence is the Testers.ai CARBON Test Harness Lite MCP server under?
Testers.ai CARBON Test Harness Lite declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.