tmda — Task Markdown for Agents

.tmda files are task ledgers: Markdown checkboxes with stable ids, a machine-computed progress block, and a validated link to the detailed brief that explains what the work is actually for.

Two rules define the format:

1. Every task is addressable — - [!] T-014 Register the callback URL, so an agent can reference, block on, and flip a specific piece of work instead of guessing which bullet was meant.
2. Progress is derived, never authored — the percentage and bar are recomputed from the checkboxes by tooling. A stale number is a validation error, not a convenience.

The prose — what the person wants to do, why, constraints, what "done" looks like — lives in a linked .md brief. Every .tmda file is required to point at one, and tmda check verifies the file and the anchor resolve.

project/
├── auth-flow-brief.md     ← prose: what we want to do and why
└── auth-flow.tmda         ← ledger: checkboxes, ids, progress

Full normative specification: SPEC.md.

Install

pipx install tmda          # recommended: isolates the CLI

or, inside a project environment:

pip install tmda

with uv:

uv tool install tmda

PyYAML is optional — pip install "tmda[yaml]" widens front-matter support to full YAML. Without it a documented YAML subset is parsed and anything outside it is a clear E002 error.

Requires Python ≥ 3.9. Single module, standard library only.

From source:

git clone https://github.com/Gakpey/tmda.git && cd tmda
pip install -e .

Quickstart

$ tmda init auth-flow --title "Sign-in and session overhaul"
created  auth-flow-brief.md
created  auth-flow.tmda
progress inserted
next:    edit auth-flow.tmda and run `tmda check`

Write the actual description in auth-flow-brief.md, then break the work down in the ledger:

## 2. Implementation

- [ ] T-010 Scaffold the auth package
  - [x] T-011 Add the provider SDK
  - [~] T-012 Wire the callback route
- [!] T-014 Register the callback URL @blocked-by=T-015
- [ ] T-015 Ask infra for the production redirect URI @owner=agent:scout @due=2026-10-28
- [ ] T-016 Rate limit the token endpoint @detail=./auth-flow-brief.md#rate-limiting @weight=3

Five checkbox states: [ ] todo · [~] in progress · [x] done · [!] blocked · [-] cancelled (excluded from the total). Metadata after the description is parsed right-to-left: @detail, @owner, @blocked-by, @weight, @due.

$ tmda sync          # (re)write the managed progress block
$ tmda check         # validate everything; exit 1 on errors
tmda check: 2 file(s)

OK - 0 error(s), 0 warning(s)

Reading progress

$ tmda status examples/auth-flow.tmda
examples/auth-flow.tmda
  Sign-in and session overhaul
  brief    ./auth-flow-brief.md  ok
  status   ✖ active
  progress `█████████░░░░░░░░░░░`  **6/14 pts (43%)**
           5 done - 1 in progress - 1 blocked - 6 todo - 1 cancelled

  sections
    ▸  4/5 (80%)  1. Research and design
    ✖  1/7 (14%)  2. Implementation
    ▸  1/2 (50%)  3. Verification

  blocked
    T-014  Register the callback URL with the provider  blocked-by T-015

  next up
    T-005  Pick the rotation interval
    T-012  Wire the callback route
    ...

For agents, tmda status --json returns the same thing as data: derived status, per-section rollups, every task with its container/parent links, plus the next (dependency-satisfied) and blocked id lists. The stable shape is documented in SPEC.md §14.3.

The agent loop

tmda status --json tasks/     # 1. what stands, what is blocked, what is next
$ less tasks/auth-flow-brief.md   # 2. read WHY before touching any checkbox
$ tmda mark T-015 done            # 3. record the outcome by id
$ tmda check --strict tasks/      # 4. hand back only if this exits 0

Step 2 is not optional — the ledger says what, the brief says why, and why decides how the work gets done.

Commands

Exit codes: 0 ok · 1 validation errors · 2 usage error.

Use it in your CI

A composite action that installs tmda and runs it over your ledgers:

# .github/workflows/tmda.yml
name: tmda
on: [push, pull_request]

jobs:
  tmda:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@v7
      - uses: Gakpey/tmda@v1
        with:
          path: tasks/        # default "."
          strict: "true"      # default - warnings fail the build
          version: latest     # or pin "1.0.0"

strict is on by default because that is where the value is: a stale progress block, a broken link into a brief, or a duplicated task id all fail the build instead of quietly rotting.

Design decisions worth knowing

Progress is computed, and only computed. There is no percent: key. The single source of truth is the checkboxes, and tmda check fails if the rendered block drifts from them (E040) — so the number in a diff is always reconstructible.

Parents don't double-count. A task with nested children is a container: its state is derived from them and it is excluded from the denominator. Nesting therefore never inflates or deflates the percentage.

Cancelled work leaves the fraction. Dropping a task must not make progress go backwards, so - [-] is excluded from both numerator and denominator.

The brief is mandatory. detail: is a required front-matter key, its target must exist, and a #fragment must match a real heading. Task-level @detail=./brief.md#rate-limiting gives one-hop access from any checkbox to the paragraph that justifies it.

Links run both ways. A brief that doesn't mention its ledger warns (W066), so a human reading the prose can always find the checkboxes.

Ids, not line numbers. T-014 survives edits; a line number does not. Everything else in the tool — mark, @blocked-by, the JSON reports — is built on that.

Repository layout

tmda/
├── SPEC.md                    normative format specification
├── README.md                  this file
├── tmda.py                    single-file, stdlib-only CLI
├── action.yml                 reusable GitHub Action
├── pyproject.toml             packaging, lint config
├── .github/workflows/         CI + PyPI release
├── examples/                  two ledger/brief pairs
└── tests/                     68 tests

Working on it:

$ pip install -e ".[dev,yaml]"
$ python3 -m unittest discover -s tests     # 68 tests
$ ruff check .
$ tmda check --strict examples

See CONTRIBUTING.md for the ground rules — notably standard library only and the format is versioned, so spec version 1 does not change.

Status

Spec version 1, initial release. The format is deliberately conservative: candidates for a future version are listed in SPEC.md §16.

License

MIT © Joshua Gakpey.