tax-build SKILL.md skillA
tax-build from filedcom/opentax is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add filedcom/opentax/tax-build@git:20261018.c26716fPins git:20261018.c26716f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- filedcom/opentax
- Path
.claude/skills/tax-build/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261018.c26716f, committed Oct 18, 2026
- First version recorded
- Apr 9, 2026
- Size
- 2,200 bytes
- Repository stars
- 131
- License
- AGPL-3.0
Build a new form product (e.g. 1120) from IRS instructions — research the lines into node specs, source IRS benchmark cases, build the nodes section by section, then hand off to the tax-fix loop.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Tax Build
**Form:** $ARGUMENTS — `<form-number> [year]`, e.g. `1120 2025` (year defaults
to 2025).
A form filed with the 1040 (a schedule or attachment) is a node under
`forms/f1040/nodes/`, not a new product: build it with
`agents/node-builder.md` alone and test it with `/tax-fix f1040:<year>`.
Read `AGENTS.md`, `docs/architecture/STRUCTURE.md` and `forms/f1040/FORM.md`,
and pass them to every agent. `forms/f4868/` is the smallest complete product
to copy the shape from. Each phase resumes from what is already on disk.
## 1. Research
Skip if `.state/bench/node-specs/{form}-{year}-nodes.json` exists (`.state/` is
untracked; create the folder). Otherwise spawn one agent with
`agents/researcher.md` to write it, and check it holds a `nodes` array.
## 2. Product skeleton
Create, following `forms/f4868/` and `forms/f1040/2026/`:
- `forms/f{form}/FORM.md`: the form's IRS specs, conventions and benchmark
command, as in `forms/f1040/FORM.md`
- `forms/f{form}/{year}/index.ts`, `config.ts`, `inputs.ts`, `registry.ts`
- a `"f{form}:{year}"` entry in `catalog.ts`
`benchmark/run_benchmark.ts` creates every return without `--form` (so as
…Read the whole file at its exact version.
How to install
mdr add filedcom/opentax/tax-build@sha256:1f4f3e843a1e4a94The line at the top of this page pins the label git:20261018.c26716f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_trufudmusymx3meu)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Apr 9, 2026 and Oct 18, 2026, about one every 48 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261018.c26716f latest | 2026-10-18 | c26716f | 2,200 B | A | view · diff |
| git:20261018.4d1a977 | 2026-10-18 | 4d1a977 | 4,668 B | A | view · diff |
| git:20261016.336fa2d | 2026-10-16 | 336fa2d | 4,503 B | A | view · diff |
| git:20260409.429a7a7 | 2026-04-09 | 429a7a7 | 4,503 B | A | view · diff |
| git:20260409.ef0840c | 2026-04-09 | ef0840c | 4,003 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2200 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
filedcom/opentax · 131 stars · license AGPL-3.0 · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_trufudmusymx3meu GET https://markdownregistry.com/api/v1/resolve?ref=filedcom/opentax/tax-build GET https://markdownregistry.com/api/v1/blob/1f4f3e843a1e4a94feacb6e788dc182a8905510ce167995b21e593cdb83c78b2
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.