Bridges to a simple_invoicing FastAPI backend, exposing invoice, product, ledger, inventory, buyer, and payment management as MCP tools for use with MCP-compatible clients.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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nikhilb2
Source: Glama
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
axios Vulnerable to Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy`
axios Vulnerable to Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge
INVOICING_API_TOKENexport =your-long-lived-bearer-token-hereINVOICING_BASE_URLexport =https://your-invoicing-instance.example.comPORTTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
20/20 tools missing one or more hints — list_buyers (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_buyer (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); create_buyer (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +17 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
15/20 tool handlers declare input schemas (75%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool handlers catch errors
Only 1/20 tool handlers wrap calls in try/catch (5%)
Wrap each tool handler body in try/catch and return a structured error response.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tool test coverage
Only 4/20 tools referenced in tests (20%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 18 high severity in production deps — @modelcontextprotocol/sdk@1.21.2 (high), @modelcontextprotocol/sdk@1.21.2 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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