crosscheck
NPM · CROSSCHECKAPI · 2 COMPONENTS · SCANNED SEP 26
Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.
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 Security100
- 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
- No production dependencies, so there is no dependency health to assess. View diagnostics → Pass
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 0 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability79
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 661 tokens (~132/item across 5 items; 5 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 Management7
- Stability observed for 2 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
- All 2 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
How do I install the crosscheck MCP server?
crosscheck runs locally as an npm package, launched with npx -y crosscheckapi. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · crosscheckapi
claude mcp add com-crosscheckapi-crosscheck -- npx -y crosscheckapi
{
"mcpServers": {
"com-crosscheckapi-crosscheck": {
"command": "npx",
"args": [
"-y",
"crosscheckapi"
]
}
}
} {
"servers": {
"com-crosscheckapi-crosscheck": {
"command": "npx",
"args": [
"-y",
"crosscheckapi"
]
}
}
} codex mcp add com-crosscheckapi-crosscheck -- npx -y crosscheckapi
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-crosscheckapi-crosscheck": {
"type": "local",
"command": [
"npx",
"-y",
"crosscheckapi"
],
"enabled": true
}
}
} openclaw mcp add com-crosscheckapi-crosscheck --command npx --arg -y --arg crosscheckapi
mcp_servers:
com-crosscheckapi-crosscheck:
command: "npx"
args: ["-y", "crosscheckapi"] {
"McpServers": {
"com-crosscheckapi-crosscheck": {
"Transport": "stdio",
"Command": "npx",
"Arguments": [
"-y",
"crosscheckapi"
]
}
}
} assistant mcp add com-crosscheckapi-crosscheck -t stdio -c npx -a -y crosscheckapi
{
"mcpServers": {
"com-crosscheckapi-crosscheck": {
"command": "npx",
"args": [
"-y",
"crosscheckapi"
]
}
}
} 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.
- 26 Sept 26 +11
- Known CVEs: unverified → pass ▲ security
- Dependency health: unverified → pass ▲ functional
- 25 Sept 26 +1
- Stability: unverified → 0.03 ▲ functional
- Package version: 0.5.1 → 0.5.4 functional
- Package version: 0.5.1 → 0.5.2 functional
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 24 Sept 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 26 Sept 2026 · Analysed npm/crosscheckapi@0.5.4
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 0 packages
| Packages resolved | 0 |
|---|---|
| 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 →
accept Check work another agent handed back (paid) ~213
Pays about $0.03 USDC from your configured wallet over x402 and checks a deliverable from another agent or service against the task you gave it: accept or reject, each requirement judged (met, not met, partly, or cannot tell), figures, counts, and JSON fields checked in code, plus a signed receipt. Use before you pay for delegated work, release escrow, or pass the result on. If status is pending, call result later with job_id and result_token.
| Name | Type | Req | Description |
|---|---|---|---|
| deliverable | string | yes | What came back, exactly as received |
| payment_network | string | – | CAIP-2 network of payment_tx, default eip155:8453 |
| payment_tx | string | – | Optional: the transaction you paid the other agent with; crosscheck verifies it on-chain and binds it to the receipt |
| reference | string | – | Optional order id or transaction hash to record on the receipt |
| task | string | yes | The task you gave, with every requirement, exactly as sent |
No output schema declared.
No examples provided.
order Order a crosscheck review (paid) ~168
Pays the quoted price (usually $0.02 USDC) from your configured wallet over x402 and returns an independent verdict on the draft: pass, or specific issues with fixes, plus a signed receipt. Use before showing a draft to your human. Pass a Moltbook identity token to use a free check first. If status is pending, call result later with job_id and result_token.
| Name | Type | Req | Description |
|---|---|---|---|
| draft | string | yes | The full text you want checked, exactly as your human would see it |
| moltbook_identity | string | – | Optional Moltbook identity token (audience crosscheckapi.com) for a free check; each token works once |
| sources | array | – | Optional: the text the draft relies on (search results, documents). Each claim is then checked against it. |
No output schema declared.
No examples provided.
quote Quote a crosscheck review ~51
Free. Returns the price in USDC for an independent review of this draft, and whether reviews are available now.
| Name | Type | Req | Description |
|---|---|---|---|
| draft | string | yes | The full text you want checked, exactly as your human would see it |
No output schema declared.
No examples provided.
result Get a crosscheck result ~51
Free. Returns the status, verdict, and verified receipt of an earlier order.
| Name | Type | Req | Description |
|---|---|---|---|
| job_id | string | yes | job_id from the order response |
| result_token | string | yes | result_token from the order response |
No output schema declared.
No examples provided.
skillcheck Security-check a skill or MCP server before installing it ~178
Reviews an agent skill or MCP server's files before you install or connect it: downloads piped into a shell, credential and wallet reads, secrets sent over the network, persistence, hidden Unicode, and prompt injection aimed at you or at the scanner. The files are read, never run. Checks the free lookup first; pays about $0.03 USDC only when nobody has scanned these exact files. Pass directory (a local folder) or files. Never says safe: no_findings means nothing was found in these files.
| Name | Type | Req | Description |
|---|---|---|---|
| directory | string | – | Local folder of the skill or server to scan (dependencies and binaries are skipped) |
| files | array | – | The files to scan, if you have them in hand instead of a folder |
| fresh | boolean | – | Pay for a new scan even if these exact files were scanned before |
No output schema declared.
No examples provided.
What is the crosscheck MCP server?
crosscheck is an MCP server listed in the public MCP registry as com.crosscheckapi/crosscheck. Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install. This page covers its npm package (crosscheckapi).
Is the crosscheck MCP server safe to use?
crosscheck scores 72 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 26 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 crosscheck MCP server expose?
crosscheck exposes 5 tools: quote, order, accept, skillcheck, result. Their descriptions and schemas cost roughly 661 tokens of context every time the server is loaded.
Is the crosscheck MCP server still maintained?
crosscheck is still listed as active in the MCP registry. We last reached this channel on 26 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 crosscheck MCP server under?
crosscheck declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.