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Agent skill

Pp Stac

by mvanhorn in mvanhorn/printing-press-library

The first Go single-binary STAC CLI: every search filter the Python tools have, plus an offline cache, scene ranking, coverage, and asset resolution no other STAC tool offers.

Apache-2.0Auto-check: notes

Install Pp Stac

skills CLI
$ npx skills add mvanhorn/printing-press-library --skill pp-stac -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mvanhorn/printing-press-library pp-stac --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mvanhorn/printing-press-library.git skills-src && mkdir -p .claude/skills && cp -r skills-src/library/maps/stac .claude/skills/pp-stac && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
pp-stac
GitHub stars
2.1k
Token cost
~3.8k tokens
SKILL.md length
1,583 words
Files
145
Skills in repo
506
Repo updated
First seen
Licence
Apache-2.0

At a glance

The first Go single-binary STAC CLI: every search filter the Python tools have, plus an offline cache, scene ranking, coverage, and asset resolution no other STAC tool offers.

  • Works in 3 steps: Install via the Printing Press… → Verify: stac-pp-cli --version → Ensure the reported install directory is…
  • Phrases: find a satellite image of
  • SKILL.md covers Prerequisites: Install the CLI, When to Use This CLI, Anti-triggers and Unique Capabilities, plus 12 more sections
  • Calls go, claude and npx

What it does

Pp Stac is an agent skill from mvanhorn/printing-press-library. The first Go single-binary STAC CLI: every search filter the Python tools have, plus an offline cache, scene ranking, coverage, and asset resolution no other STAC tool offers. Trigger phrases: find a satellite image of, least cloudy scene over, what sentinel-2 imagery is available for, check coverage for this area, get the band URLs for this scene, use stac, run stac.

Its SKILL.md is about 3.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 149 other files (for example `.golangci.yml`, `.goreleaser.yaml` and `.manuscripts/20260624-152026-b6ccb73c/proofs/dogfood-full.json`).

It works with Python. The repository describes itself as: Official library of CLIs generated by the CLI Printing Press. Endorsed, tested, and community-contributed. The licence is Apache-2.0.

When your agent uses it

  • Phrases: find a satellite image of
  • Least cloudy scene over
  • What sentinel-2 imagery is available for
  • Check coverage for this area

Example prompts

  • “/pp-stac”

Requirements

  • Python 3
  • Node.js
  • Pre-approved tools (allowed-tools): Read, Bash

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Install via the Printing Press installer. It defaults binaries to $HOME/.local/bin on macOS/Linux and…
  2. Verify: stac-pp-cli --version
  3. Ensure the reported install directory is on $PATH for the agent/runtime that will invoke this skill.

What it can do on your machine

Read from SKILL.md and the folder at commit 76de244. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Bash

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • go
    • claude
    • npx

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Pp Stac loads about 3.8k tokens when it runs. Until then it costs about 98 tokens; SKILL.md has 1,583 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~98
When it runs · the whole SKILL.md, loaded when a task matches
~3.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mvanhorn/printing-press-library at commit 76de244, republished under its Apache-2.0 licence (© mvanhorn). 1,583 words, ~3,819 tokens.

Download SKILL.mdSave it as .claude/skills/pp-stac/SKILL.md (or your agent's skills folder). This skill also uses 144 other files; get the full folder from GitHub.
name
pp-stac
description
The first Go single-binary STAC CLI: every search filter the Python tools have, plus an offline cache, scene ranking, coverage, and asset resolution no other STAC tool offers. Trigger phrases: `find a satellite image of`, `least cloudy scene over`, `what sentinel-2 imagery is available for`, `check coverage for this area`, `get the band URLs for this scene`, `use stac`, `run stac`.
allowed-tools
Read, Bash
author
ghltshubh
license
Apache-2.0
argument-hint
<command> [args] | install cli|mcp

STAC — Printing Press CLI

Prerequisites: Install the CLI

This skill drives the stac-pp-cli binary. You must verify the CLI is installed before invoking any command from this skill. If it is missing, install it first:

  1. Install via the Printing Press installer. It defaults binaries to $HOME/.local/bin on macOS/Linux and %LOCALAPPDATA%\Programs\PrintingPress\bin on Windows:
    bash
    npx -y @mvanhorn/printing-press-library install stac --cli-only
  2. Verify: stac-pp-cli --version
  3. Ensure the reported install directory is on $PATH for the agent/runtime that will invoke this skill.

If the npx install fails (no Node, offline, etc.), fall back to a direct Go install (requires Go 1.26.6 or newer). This installs into $GOPATH/bin (default $HOME/go/bin), so add that directory to $PATH instead:

bash
go install github.com/mvanhorn/printing-press-library/library/maps/stac/cmd/stac-pp-cli@latest

If --version reports "command not found" after install, the runtime cannot see the binary directory on $PATH. Do not proceed with skill commands until verification succeeds.

stac-pp-cli searches any STAC API (default: AWS Earth Search) for satellite imagery with full bbox/datetime/intersects/cloud-cover filtering, then goes beyond every existing tool: a local SQLite cache powers offline search, coverage, timeline, gaps, and watch; scenes best ranks for the clearest image with a client-side fallback; and assets resolves provider-aware band download URLs. Agent-native by default with --json, --select, and a typed MCP surface.

When to Use This CLI

Use stac-pp-cli when an agent or analyst needs to discover satellite imagery (Sentinel-2, Landsat, Sentinel-1, NAIP, Copernicus DEM) from a STAC API, pick the clearest scene over an area, check temporal coverage, or resolve band download URLs. It is ideal for scripting EO discovery and for agent workflows that need bounded, structured output instead of verbose GeoJSON.

Anti-triggers

Do not use this CLI for:

  • Downloading or reprojecting the actual raster pixels (use rasterio, gdal, or stackstac/odc-stac after resolving URLs with 'assets')
  • Authoring or validating static STAC catalogs (use stactools or go-stac)
  • Tiling or rendering imagery for a web map (use titiler)

Unique Capabilities

These capabilities aren't available in any other tool for this API.

Scene selection

  • scenes best — Pick the single clearest scene over an area and date range.

    Reach for this when an agent needs the one best image for an AOI, not a list to sift through.

    bash
    stac-pp-cli scenes best --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-06-01/2024-06-30 --agent

  • clouds — Show the cloud-cover distribution over an area and date range.

    Use before downloading to judge how cloudy a window is without pulling any imagery.

    bash
    stac-pp-cli clouds --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-06-01/2024-08-31 --agent
Coverage and time

  • coverage — Answer whether data exists over an area and when, with a temporal summary.

    Reach for this to confirm an AOI has usable data before planning an analysis.

    bash
    stac-pp-cli coverage --collection landsat-c2-l2 --bbox -122.5,37.7,-122.3,37.9 --datetime 2023-01-01/2024-12-31 --agent

  • timeline — Build a per-date time series of scenes for change detection.

    Use to assemble a clean observation series for NDVI or change detection.

    bash
    stac-pp-cli timeline --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-01-01/2024-06-30 --max-cloud 30 --agent

  • gaps — Find missing acquisition windows over an area versus expected revisit.

    Reach for this to spot coverage holes before relying on a time series.

    bash
    stac-pp-cli gaps --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-01-01/2024-06-30 --revisit-days 5 --agent

  • watch — Report scenes published over an area since the last check.

    Use to monitor an AOI for fresh imagery across runs.

    bash
    stac-pp-cli watch --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --agent
Assets and analysis

  • assets — Resolve an item's band and asset download URLs, provider-aware.

    Reach for this to get ready-to-download band URLs without parsing the raw item JSON.

    bash
    stac-pp-cli assets S2A_10SEG_20240622_0_L2A --collection sentinel-2-l2a --bands red,green,blue,nir --agent

  • compare — Compare two collections over the same area and date range.

    Use to choose between sensors (e.g. Sentinel-2 vs Landsat) for an AOI.

    bash
    stac-pp-cli compare sentinel-2-l2a landsat-c2-l2 --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-01-01/2024-06-30 --agent

  • stack-snippet — Emit a ready-to-paste stackstac/odc-stac Python snippet for matched scenes.

    Reach for this to jump from scene discovery straight into an xarray workflow.

    bash
    stac-pp-cli stack-snippet --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-06-01/2024-06-30 --bands red,green,blue,nir

Command Reference

aggregate — Manage aggregate

  • stac-pp-cli aggregate — Executes one or more aggregations (e.g.

aggregations — Manage aggregations

  • stac-pp-cli aggregations get — Lists the aggregations available across the catalog (e.g. total_count, datetime_frequency, cloud_cover_frequency).

collections — All endpoints related to STAC API - Collections

  • stac-pp-cli collections describe — A single Feature Collection for the given if collectionId.
  • stac-pp-cli collections get — A body of Feature Collections that belong or are used together with additional links.

conformance — Manage conformance

  • stac-pp-cli conformance — A list of all conformance classes specified in a standard that the server conforms to.

items — Manage items

  • stac-pp-cli items get-search — Retrieve Items matching filters. Intended as a shorthand API for simple queries. This method is required to implement.
  • stac-pp-cli items post-search — Retrieve items matching filters. Intended as the standard, full-featured query API.

queryables — Manage queryables

  • stac-pp-cli queryables get — Returns the set of queryable properties (JSON Schema) usable in query/filter across the whole catalog.
Finding the right command

When you know what you want to do but not which command does it, ask the CLI directly:

bash
stac-pp-cli which "<capability in your own words>"

which resolves a natural-language capability query to the best matching command from this CLI's curated feature index. Exit code 0 means at least one match; exit code 2 means no confident match — fall back to --help or use a narrower query.

Recipes

Clearest scene this season
bash
stac-pp-cli scenes best --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-06-01/2024-09-30

Ranks scenes by cloud cover and returns the single best one with its band URLs.

Trim a verbose search for an agent
bash
stac-pp-cli items get-search --collections sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-06-01/2024-06-30 --agent --select 'features.id,features.properties.eo:cloud_cover,features.properties.datetime'

Pairs --agent with --select dotted paths to return only id, cloud cover, and datetime from the deeply nested item response.

Is there any data here?
bash
stac-pp-cli coverage --collection sentinel-2-l2a --bbox 2.2,48.8,2.4,48.9 --datetime 2024-01-01/2024-12-31

Returns the matched count and temporal min/max/frequency so you know if an AOI is worth analyzing.

Build a clean time series
bash
stac-pp-cli timeline --collection sentinel-2-l2a --bbox -122.5,37.7,-122.3,37.9 --datetime 2024-01-01/2024-06-30 --max-cloud 30

One low-cloud observation per date, deduped by orbit and tile, ready for change detection.

Get band download URLs
bash
stac-pp-cli assets S2A_10SEG_20240622_0_L2A --collection sentinel-2-l2a --bands red,green,blue,nir

Resolves the cloud-optimized GeoTIFF URLs for the requested bands.

Auth Setup

No authentication required.

Run stac-pp-cli doctor to verify setup.

Agent Mode

Add --agent to any command. Expands to: --json --compact --no-input --no-color --yes.

  • Pipeable — JSON on stdout, errors on stderr

  • Filterable — --select keeps a subset of fields. Dotted paths descend into nested structures; arrays traverse element-wise. Critical for keeping context small on verbose APIs:

    bash
    stac-pp-cli aggregate --agent --select id,name,status

  • Previewable — --dry-run shows the request without sending

  • Offline-friendly — sync/search commands can use the local SQLite store when available

  • Non-interactive — never prompts, every input is a flag

  • Explicit retries — use --idempotent only when an already-existing create should count as success

Show full SKILL.md (655 more words)Show less
Response envelope

Commands that read from the local store or the API wrap output in a provenance envelope:

json
{
  "meta": {"source": "live" | "local", "synced_at": "...", "reason": "..."},
  "results": <data>
}

Parse .results for data and .meta.source to know whether it's live or local. A human-readable N results (live) summary is printed to stderr only when stdout is a terminal AND no machine-format flag (--json, --csv, --compact, --quiet, --plain, --select) is set — piped/agent consumers and explicit-format runs get pure JSON on stdout.

Paths and state

Agents should treat the CLI's path resolver as part of the runtime contract:

  • Use --home <dir> for one invocation, or set STAC_HOME=<dir> to relocate all four path kinds under one root.

  • Use per-kind env vars only when a specific kind must diverge: STAC_CONFIG_DIR, STAC_DATA_DIR, STAC_STATE_DIR, STAC_CACHE_DIR.

  • Resolution order is per-kind env var, --home, STAC_HOME, XDG (XDG_CONFIG_HOME, XDG_DATA_HOME, XDG_STATE_HOME, XDG_CACHE_HOME), then platform defaults.

  • config contains settings like config.toml and profiles. data contains credentials.toml, data.db, cookies, and auth sidecars. state contains persisted queries, jobs, and teach.log. cache contains regenerable HTTP/cache files.

  • Stored secrets live in credentials.toml under the data dir. Existing legacy config.toml secrets are read for compatibility and leave config.toml on the first auth write.

  • Run stac-pp-cli doctor --fail-on warn to surface path and credential-location warnings. agent-context exposes a schema v4 paths block for agents that need the resolved dirs.

  • For MCP, pass relocation through the MCP host config. The MCP binary does not inherit CLI flags:

    json
    {
  "mcpServers": {
    "stac": {
      "command": "stac-pp-mcp",
      "env": {
        "STAC_HOME": "/srv/stac"
      }
    }
  }
}

Fleet precedence: an inherited per-kind env var overrides an explicit --home for that kind. Use STAC_HOME or per-kind vars as durable fleet levers, and use --home only for a single invocation. Relocation is not reversible by unsetting env vars; move files manually before clearing STAC_HOME, or doctor will not find credentials left under the former root.

Agent Feedback

When you (or the agent) notice something off about this CLI, record it:

stac-pp-cli feedback "the --since flag is inclusive but docs say exclusive"
stac-pp-cli feedback --stdin < notes.txt
stac-pp-cli feedback list --json --limit 10

Entries are stored locally as feedback.jsonl under the resolved data dir. They are never POSTed unless STAC_FEEDBACK_ENDPOINT is set AND either --send is passed or STAC_FEEDBACK_AUTO_SEND=true. Default behavior is local-only.

Write what surprised you, not a bug report. Short, specific, one line: that is the part that compounds.

Output Delivery

Every command accepts --deliver <sink>. The output goes to the named sink in addition to (or instead of) stdout, so agents can route command results without hand-piping. Three sinks are supported:

SinkEffect
stdoutDefault; write to stdout only
file:<path>Atomically write output to <path> (tmp + rename)
webhook:<url>POST the output body to the URL (application/json or application/x-ndjson when --compact)

Unknown schemes are refused with a structured error naming the supported set. Webhook failures return non-zero and log the URL + HTTP status on stderr.

Named Profiles

A profile is a saved set of flag values, reused across invocations. Use it when a scheduled agent calls the same command every run with the same configuration - HeyGen's "Beacon" pattern.

stac-pp-cli profile save briefing --json
stac-pp-cli --profile briefing aggregate
stac-pp-cli profile list --json
stac-pp-cli profile show briefing
stac-pp-cli profile delete briefing --yes

Explicit flags always win over profile values; profile values win over defaults. agent-context lists all available profiles under available_profiles so introspecting agents discover them at runtime.

Exit Codes

CodeMeaning
0Success
2Usage error (wrong arguments)
3Resource not found
5API error (upstream issue)
7Rate limited (wait and retry)
10Config error

Argument Parsing

Parse $ARGUMENTS:

  1. Empty, help, or --help → show stac-pp-cli --help output
  2. Starts with install → ends with mcp → MCP installation; otherwise → see Prerequisites above
  3. Anything else → Direct Use (execute as CLI command with --agent)

MCP Server Installation

  1. Install the MCP server:
    bash
    go install github.com/mvanhorn/printing-press-library/library/maps/stac/cmd/stac-pp-mcp@latest
  2. Register with Claude Code:
    bash
    claude mcp add stac-pp-mcp -- stac-pp-mcp
  3. Verify: claude mcp list

Direct Use

  1. Check if installed: which stac-pp-cli If not found, offer to install (see Prerequisites at the top of this skill).
  2. Match the user query to the best command from the Unique Capabilities and Command Reference above.
  3. Execute with the --agent flag:
    bash
    stac-pp-cli <command> [subcommand] [args] --agent
  4. If ambiguous, drill into subcommand help: stac-pp-cli <command> --help.

© mvanhorn, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 144 other files in library/maps/stac of mvanhorn/printing-press-library.

  • SKILL.md
  • .golangci.yml
  • .goreleaser.yaml
  • .manuscripts/20260624-152026-b6ccb73c/proofs/dogfood-full.json
  • .manuscripts/20260624-152026-b6ccb73c/proofs/phase5-acceptance.json
  • .manuscripts/20260624-152026-b6ccb73c/research.json
  • .manuscripts/20260624-152026-b6ccb73c/research/2026-06-24-feat-stac-pp-cli-absorb-manifest.md
  • .manuscripts/20260624-152026-b6ccb73c/research/2026-06-24-feat-stac-pp-cli-brief.md
  • .manuscripts/20260624-152026-b6ccb73c/research/stac-enriched-spec.json
  • .printing-press-patches/.gitkeep
  • .printing-press-patches/ambiguous-write-retries-disabled.json
  • .printing-press-patches/batch-rollback-reports-committed-count.json
  • .printing-press-patches/path-parameters-percent-encoded.json
  • .printing-press-patches/stac-compare-single-call.json
  • .printing-press-patches/stac-output-shape-nits.json
  • .printing-press-patches/stac-temporal-sort-coverage.json
  • … and 129 more

Open the folder on GitHubat commit 76de244

Compare with similar skills

Pp Stac next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Pp Stac compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Pp Stac this skillmvanhorn/printing-press-library2.1k—~3.8kAutomated safety check: NotesApache-2.0
MCP Server Builderanthropics/skills180k63 repos~2.3kAutomated safety check: PassApache-2.0
PDF Processinganthropics/skills180k48 repos~2kAutomated safety check: PassProprietary
NotebookLM Research AssistantPleasePrompto/notebooklm-skill7.8k14 repos~2.4kAutomated safety check: NotesMIT
Manim Video Productionbrowser-use/video-use28k6 repos~3kAutomated safety check: PassMIT
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Works with

Questions about Pp Stac

What does Pp Stac do?

The first Go single-binary STAC CLI: every search filter the Python tools have, plus an offline cache, scene ranking, coverage, and asset resolution no other STAC tool offers. Pp Stac is an agent skill from mvanhorn/printing-press-library. The first Go single-binary STAC CLI: every search filter the Python tools have, plus an offline cache, scene ranking, coverage, and asset resolution no other STAC tool offers.

When should I use Pp Stac?

Pp Stac fits situations like: phrases: find a satellite image of; least cloudy scene over; what sentinel-2 imagery is available for; check coverage for this area.

How do I install Pp Stac in Claude Code?

Run `npx skills add mvanhorn/printing-press-library --skill pp-stac -a claude-code`. Or copy the skill folder (library/maps/stac in mvanhorn/printing-press-library) into .claude/skills/pp-stac in your project. Claude Code loads it when a task matches its description.

How do I install Pp Stac in Codex?

Run `npx skills add mvanhorn/printing-press-library --skill pp-stac -a codex`. Or copy the skill folder (library/maps/stac in mvanhorn/printing-press-library) into .agents/skills/pp-stac in your project. Codex loads it when a task matches its description.

Can I use Pp Stac in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mvanhorn/printing-press-library --skill pp-stac -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/pp-stac, .gemini/skills/pp-stac, .github/skills/pp-stac and .opencode/skills/pp-stac in your project.

What does Pp Stac need to run?

Going by SKILL.md and its folder, Pp Stac needs the command-line tools its instructions call (go, claude and npx). Our summary lists: Python 3; Node.js. Its frontmatter pre-approves these tools: Read, Bash.

Does Pp Stac access the network?

SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Pp Stac safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Pp Stac use?

Pp Stac is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Pp Stac use?

About 3.8k tokens (SKILL.md is roughly 15k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Pp Stac?

Skills that share tags, products or a category with Pp Stac: MCP Server Builder (anthropics/skills, 180k stars), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Pp Stac?

mvanhorn (a GitHub user) maintains it in mvanhorn/printing-press-library, which has 2,056 GitHub stars. The repository holds 506 skills in this directory. The repository was last updated on October 9, 2026.

Source: mvanhorn/printing-press-library on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.