Jarroba Tools
NPM · @JARROBA/MCP · SCANNED SEP 21
104 deterministic tools for your AI: logs, tests, SQL, diagrams, SPARQL. Local, no network.
Available components
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 Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 35 of 110 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency19
- Repository check failed: the declared repository URL returned HTTP 404. See how to fix → View diagnostics → Fail
- 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 2 days ago).Pass
- Security-disclosure policy not yet verified: we couldn't inspect the source repository.Unverified
Schema Quality & AI Usability68
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 14133 tokens (~135/item across 104 items; 104 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 Management30
- Stability observed for 9 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage92
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 76% of tool parameters carry a description.Partial
Tool Safety75
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 0 of 3 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "calc_eval" implies "eval" and declares readOnlyHint instead, contradicting what its own name says it does. See how to fix → Fail
- An AI judge read all 105 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
How do I install the Jarroba Tools MCP server?
Jarroba Tools runs locally as an npm package, launched with npx -y @jarroba/mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · @jarroba/mcp
claude mcp add invarato-jarroba-tools -- npx -y @jarroba/mcp
{
"mcpServers": {
"invarato-jarroba-tools": {
"command": "npx",
"args": [
"-y",
"@jarroba/mcp"
]
}
}
} {
"servers": {
"invarato-jarroba-tools": {
"command": "npx",
"args": [
"-y",
"@jarroba/mcp"
]
}
}
} codex mcp add invarato-jarroba-tools -- npx -y @jarroba/mcp
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"invarato-jarroba-tools": {
"type": "local",
"command": [
"npx",
"-y",
"@jarroba/mcp"
],
"enabled": true
}
}
} openclaw mcp add invarato-jarroba-tools --command npx --arg -y --arg @jarroba/mcp
mcp_servers:
invarato-jarroba-tools:
command: "npx"
args: ["-y", "@jarroba/mcp"] {
"McpServers": {
"invarato-jarroba-tools": {
"Transport": "stdio",
"Command": "npx",
"Arguments": [
"-y",
"@jarroba/mcp"
]
}
}
} assistant mcp add invarato-jarroba-tools -t stdio -c npx -a -y @jarroba/mcp
{
"mcpServers": {
"invarato-jarroba-tools": {
"command": "npx",
"args": [
"-y",
"@jarroba/mcp"
]
}
}
} 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.
- 21 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.
- 19 Sept 26 +16
- Malware scan: unverified → pass ▲ security
- 18 Sept 26 −15
- Malware scan: pass → unverified ▼ security
- Package version: 0.1.4 → 0.1.5 functional
- 17 Sept 26 +16
- Malware scan: unverified → pass ▲ security
- 16 Sept 26 −13
- Malware scan: pass → unverified ▼ security
- Tool safety: pass → unverified ▼ security
- Stability: Stability not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet. security
- Capabilities: pass → unverified ▼ functional
- Tool coverage: 100 → unverified ▼ functional
- Stability: unverified → 0.13 ▲ functional
- First check of Schema quality: unverified functional
- Package version: 0.1.2 → 0.1.4 functional
- 13 Sept 26 +15
- Malware scan: unverified → pass ▲ security
- 12 Sept 26 46
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 21 Sept 2026 · Analysed npm/@jarroba/mcp@0.1.5
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 110 packages
| Packages resolved | 110 |
|---|---|
| Stale | 35 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
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 →
unicode_info ~45
Unicode details for every character in a string: code point (U+…), name/category, UTF-8/16 bytes, HTML entity, escapes.
| Name | Type | Req | Description |
|---|---|---|---|
| input | string | yes | – |
No output schema declared.
No examples provided.
unit_convert ~82
Convert data sizes between SI multiples (kB/MB, base 1000) and IEC multiples (KiB/MiB, base 1024), and between bits and bytes. Settles the usual KB-vs-KiB confusion.
| Name | Type | Req | Description |
|---|---|---|---|
| input | string | yes | e.g. "15 Mb", "1 GiB", "1500 kB" |
No output schema declared.
No examples provided.
url_parse ~34
Break a URL into protocol, host, port, path, query (parsed) and fragment.
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | – |
No output schema declared.
No examples provided.
wcag_contrast ~81
WCAG contrast ratio between two colors, and whether it passes AA/AAA for normal and large text. Accepts #rgb/#rrggbb, rgb(), hsl() or CSS names.
| Name | Type | Req | Description |
|---|---|---|---|
| background | string | yes | e.g. "#fff" or "white" |
| foreground | string | yes | e.g. "#333" or "black" |
No output schema declared.
No examples provided.
What is the Jarroba Tools MCP server?
Jarroba Tools is an MCP server listed in the public MCP registry as io.github.Invarato/jarroba-tools. 104 deterministic tools for your AI: logs, tests, SQL, diagrams, SPARQL. Local, no network. This page covers its npm package (@jarroba/mcp).
Is the Jarroba Tools MCP server safe to use?
Jarroba Tools scores 66 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 21 September 2026. It declares no install or post-install scripts. 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 Jarroba Tools MCP server expose?
Jarroba Tools exposes 104 tools: cidr_info, cidr_contains, cidr_vlsm, count_tokens, hash_text, and 99 more. Their descriptions and schemas cost roughly 13,916 tokens of context every time the server is loaded.
Is the Jarroba Tools MCP server still maintained?
Jarroba Tools is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the Jarroba Tools MCP server under?
Jarroba Tools declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.