Formulon MCP Server
@libraz/formulon-mcp
npm
v0.6.0
Source verified
Published by libraz — publish provenance cryptographically ties this package to that repository. That is proof of origin, not an official vendor package.
MCP server for Formulon Excel-compatible formula and workbook evaluation
The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.
1. Threat score — 100 − 0 = 100. What the published surface and source actually contain:
The deterministic scan raised no scored threat in the surface it inspected — the threat score stayed at 100. Capability observations and advisory notes are recorded but never lower it.
2. Client adoption risk — 100 − 6 = 94. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:
| Points | Adoption-risk factor |
|---|---|
| −6 | capability blast radius (high) — client exposure if the model is manipulated |
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind a deduction.
Findings 3
high Tool "formulon_eval_formula" exposes command/code executionMTC-CAP-001
Tool "formulon_eval_formula" appears to run shell commands or evaluate code (keyword "eval" in tool name). Arbitrary execution driven by model input is one of the most dangerous MCP capabilities; combined with any untrusted input it becomes RCE.
Fix: Sandbox execution, allowlist commands/arguments, and never pass model output to a shell unescaped.
Location: tool formulon_eval_formula
medium Untrusted input can drive an external actionMTC-FLOW-005
Untrusted-input tools ([formulon_trace]) co-exist with external-action tools ([formulon_eval_formula]). A prompt injection could cause unwanted external actions, though no direct sensitive-data leak path was found.
Evidence: untrusted [formulon_trace] → sinks [formulon_eval_formula]
Fix: Require confirmation for state-changing/egress actions triggered after processing untrusted content.
Location: flow formulon_trace → formulon_eval_formula
low Mutating tool "formulon_eval_formula" declares no destructiveHintMTC-CAP-005
Tool "formulon_eval_formula" can mutate/egress but declares no destructiveHint. Clients that don't default to spec-safe behavior may not prompt before running it.
Fix: Declare accurate annotations, and gate destructive tools on user confirmation regardless.
Location: tool formulon_eval_formula
Tools 37
Each tool and what it can reach — statically extracted from the published source.
formulon_eval_formularuns code / shellformulon_traceingests untrusted inputformulon_analyze_workbookno sensitive capabilityformulon_build_documentno sensitive capabilityformulon_close_workbookno sensitive capabilityformulon_comment_operationno sensitive capabilityformulon_conditional_format_operationno sensitive capabilityformulon_default_fontno sensitive capabilityformulon_detect_regionsno sensitive capabilityformulon_dimension_operationno sensitive capability
Show 27 more tools ↓
formulon_edit_structureno sensitive capabilityformulon_find_cellsno sensitive capabilityformulon_function_lookupno sensitive capabilityformulon_get_cellno sensitive capabilityformulon_get_rangeno sensitive capabilityformulon_hyperlink_operationno sensitive capabilityformulon_inspect_layoutno sensitive capabilityformulon_inspect_sessionno sensitive capabilityformulon_inspect_workbookno sensitive capabilityformulon_list_sessionsno sensitive capabilityformulon_merge_operationno sensitive capabilityformulon_open_workbookno sensitive capabilityformulon_print_settingsno sensitive capabilityformulon_recalc_sessionno sensitive capabilityformulon_replace_cellsno sensitive capabilityformulon_save_sessionno sensitive capabilityformulon_session_metadatano sensitive capabilityformulon_set_cellsno sensitive capabilityformulon_set_defined_nameno sensitive capabilityformulon_set_rangeno sensitive capabilityformulon_set_sheet_viewno sensitive capabilityformulon_sheet_operationno sensitive capabilityformulon_style_rangeno sensitive capabilityformulon_update_workbookno sensitive capabilityformulon_validation_operationno sensitive capabilityformulon_versionno sensitive capabilityformulon_workbook_callno sensitive capability
Toxic flows 1
Cross-tool combinations that form a data-exfiltration primitive (untrusted input → sensitive source → external sink).
What this scan could not see
- Tools were statically extracted from the published source (37 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Versions 4
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v0.6.0 latest |
A 94/100 | 3 | 1.13.0 | 2026-09-07 |
v0.5.0 |
A 94/100 | 3 | 1.12.1 | 2026-08-22 |
v0.4.0 |
A 94/100 | 3 | 1.12.1 | 2026-08-21 |
v0.3.0 |
A 94/100 | 3 | 1.12.1 | 2026-08-18 |
Embed this score
Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.
Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
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