Atlas / MCP servers / clay-good / geoprims

geoprimsBLOCK

Name: geoprims
Author: clay-good

mcp/clay-good/geoprims

MCP server by clay-good · aviation · calculator · coordinates · Audited 2026-10-13

Free, exact, cited calculators for pilots, drone operators, surveyors, and GIS developers: a static website (geoprims.com) and a local MCP server. Runs on your device.

Verdict

BLOCK

Grade

Trust score

40 /100

Exposed tools

12 9r · 3w · 0d

Transport

—

License

MIT

Stars

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

Exact, cited math for maps, flight, drones, and surveying. It runs on your device.

Density altitude before a flight. Ground sample distance for a drone survey. A traverse closure, a UTM conversion, an H3 cell, sunrise at a field site. geoprims answers questions like these in a plain sentence, then shows how it got there.

For people: a fast, free website. The answer comes first, with a map or diagram and a "How we got this" panel showing the formula with your numbers and its sources.
For AI agents: a local MCP server that runs the same calculators and returns the same results, byte for byte. It has no dependencies and stays offline unless optional verified asset downloads are explicitly enabled. See mcp/README.md.

Why trust it

Accurate. Reference methods (Karney geodesics, not haversine), tested against GeographicLib, PROJ, H3, S2, and published worked examples, each held to a per-domain tolerance (1 mm in geodesy, for example) unless the source itself prints coarser.
Cited. Every result names its source, edition, and section. The build fails if a source goes out of date. Every citation link is checked monthly, and a dead or moved one opens an issue.
Honest. Assumptions like datum, true vs. magnetic north, and rules of thumb show up as warnings, not fine print.
Private. No ads, accounts, tracking, or server-side math. Your inputs never leave your device.
Auditable. The CycloneDX software bill of materials lists every locked Cargo and npm dependency and its license. The build fails when either lockfile and the inventory disagree.

What it covers

Geodesy, navigation, geometry, aviation, drones, surveying, spatial indexing, raster and terrain, time, and units.

The 8 launch journeys are published as end-to-end workflows with prefilled, linked calculator steps, and the concept library exceeds its initial 25-explainer launch target. The build runs every workflow thr

Read from source at commit f02be4f10852OBSERVED · 2026-10-13

Connect

Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.

claude-code

claude mcp add geoprims -- npx -y geoprims

claude-desktop

{
  "mcpServers": {
    "geoprims": {
      "command": "npx",
      "args": [
        "-y",
        "geoprims"
      ]
    }
  }
}

Exposed tools (12)

9 read · 3 write · 0 destructive.

Tool	Risk	Description
`catalog`	read	Every tool id with title, summary, domain, and stability.
`coordinate-conversion-audit`	read	Parses a coordinate in any common notation, converts it to UTM, and converts back to show the round-trip error.
`geoprims_convert_units`	read	Convert a value between units with exact definitions, e.g. {value: 100, from:
`geoprims_describe`	read	Get manifests for up to 20 tool or workflow ids. A workflow id (workflow.<slug>) gives its inputs, its steps, and the values it fixes. detail
`geoprims_pipeline`	write	Run up to 20 tools in order without round trips. Each step is {id, args, bind}; bind maps an input JSON Pointer to
`geoprims_run`	write	Run one tool or workflow by id. For a workflow (workflow.<slug>), args are the workflow\
`geoprims_search`	read	Find geoprims calculators (geodesy, navigation, aviation, drone, survey, indexing, time, units) by plain words, abbreviations, or tool id. Returns ranked ids with summaries. Numbers in the query fill inputs: prefill on the top result holds args for geoprims_run (
`h3-resolution-choice`	read	Picks the H3 resolution whose average cell area is closest to a target, then shows the cell at a location and its real area there.
`photogrammetry-mission`	write	Flight height for a target ground sample distance, then trigger interval and line spacing at the chosen overlaps, and the longest exposure that keeps motion blur under half a pixel.
`preflight-performance`	read	Pressure altitude, density altitude, and runway wind components for a departure, with the crosswind checked against a limit.
`tool`	read	Full manifest with accuracy, references, worked example, and golden vectors.
`traverse-closure`	read	Closes a traverse from its courses and reports misclosure, its bearing, and precision ratio.

Trust audit

BLOCKgrade F · trust 40/100 Do not install this without reading the findings. The audit found something that could harm you or your machine.

Layer	What it checks	Result
L0	Provenance & inventory	FAIL
L1	Static analysis of the code	FAIL
L2	Instruction surface (what it tells the agent)	PASS
L3	Class-specific surface	PASS
L4	Behavioural (sandbox)	SKIPPED

What the source does

Filesystem: declared (6 observation(s))
Network: declared (10 observation(s))
Shell: declared (3 observation(s))
Dependencies: pinned
Secrets in source: found

Findings (25)

HIGHInventory / provenance · inv.suspicious_name · CWE-1104

core/vectors/drone.power.max-payload.jsonl

drone.power.max-payload.jsonl

Why it matters. member named after an attack tool

Fix. remove or justify

HIGHInventory / provenance · inv.suspicious_name · CWE-1104

core/vectors/drone.power.payload-impact.jsonl

drone.power.payload-impact.jsonl

Why it matters. member named after an attack tool

Fix. remove or justify

HIGHCode injection · code.eval_exec · CWE-78, CWE-94, CWE-95

core/crates/gp-base/src/template.rs:242

fn eval(e: &Expr, s: &dyn Scope) -> Option<Val> {

Why it matters. evaluates text as code

Fix. remove; use a parser or a dispatch table

HIGHCode injection · code.eval_exec · CWE-78, CWE-94, CWE-95

core/crates/gp-base/src/template.rs:245

Expr::Abs(x) => eval(x, s).map(|v| Val {

Why it matters. evaluates text as code

Fix. remove; use a parser or a dispatch table

HIGHCode injection · code.eval_exec · CWE-78, CWE-94, CWE-95

core/crates/gp-base/src/template.rs:250

let (a, b) = (eval(a, s)?, eval(b, s)?);

Why it matters. evaluates text as code

Fix. remove; use a parser or a dispatch table

MEDIUMInventory / provenance · inv.binary · CWE-1104

assets/data/nadcon5/20160901/as62_nad83_1993_as.grid

as62_nad83_1993_as.grid