symphony-trello: Skill for Codex

.codex/skills/trello-handoff/SKILL.md

trello-handoff is a skill for Codex from martin-francois/symphony-trello. It costs 41 tokens per session (2,072 once invoked), scanned A, original, Apache-2.0.

Instructions for moving the current Trello card through the Symphony for Trello workflow. They cover starting work, handing it to a person for review, recording blockers, and completing a merge.

In plain words
What is it for?
Use them when picking up a card, changing its workflow list, recording a handoff or blocker, or marking work complete.
Why use it?
They make card status changes consistent and keep active lists from containing blocked or finished work.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: mentions Codex.

This is martin-francois/symphony-trello's own configuration. It tells Codex how to work on symphony-trello itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything symphony-trello configures →

Reuse

Borrowing it

Nothing to install: this file belongs to martin-francois/symphony-trello. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/martin-francois/symphony-trello/main/.codex/skills/trello-handoff/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/martin-francois/symphony-trello

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for trello-handoff

README.md
[![agentmods](https://agentmods.dev/badge/skills/martin-francois/symphony-trello/trello-handoff/github.svg)](https://agentmods.dev/skills/martin-francois/symphony-trello/trello-handoff)
Your own site
<a href="https://agentmods.dev/skills/martin-francois/symphony-trello/trello-handoff"><img src="https://agentmods.dev/badge/skills/martin-francois/symphony-trello/trello-handoff/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for trello-handoff

Your own site · 80×15
<a href="https://agentmods.dev/skills/martin-francois/symphony-trello/trello-handoff"><img src="https://agentmods.dev/badge/skills/martin-francois/symphony-trello/trello-handoff.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,072 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.02072
Opus 5 $0.00020 $0.01036
Sonnet 5 $0.00008 $0.00414
Haiku 4.5 $0.00004 $0.00207

Measured 11d ago against content hash 263c14ebcaaa, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

trello-handoff scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.codex/skills/trello-handoff/SKILL.md · 218 lines

How it starts

The opening of the file, as written. The whole thing — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Trello Handoff

Goals

  • Move only the current card through configured board lists.
  • Leave clear Trello comments for humans.
  • Keep active lists free of blocked or completed work.
  • Use the workpad for detailed state and a short comment for the visible handoff.

Current-Card Tools

Use these scoped tools when they are advertised:

  • trello_move_current_card
  • trello_add_comment
  • trello_upsert_workpad
  • trello_update_blocker_recheck_status

The move tool uses Trello's term list_name for a board list name.

Pickup

When a card starts in Ready for Codex and an In Progress list is configured, Symphony normally moves it to In Progress before Codex starts. If Codex still needs to request the pickup move, apply the stale-blocker check below first and publish any required checking status before that tool call:

{
  "tool": "trello_move_current_card",
  "arguments": {
    "list_name": "In Progress"
  }
}

If no in-progress list is configured, leave the card in its active list and continue work.

Stale Blocker Recheck

This section applies only when trello_update_blocker_recheck_status is advertised. When it is unavailable, do not attempt a managed recheck write; follow the workflow's tool-disabled final-response or manual handoff path.

The rendered prompt contains only recent Trello comments, so do not use it to decide whether a stale blocker exists. When the tool is advertised, always call it with status checking before changing code. The tool inspects the deep current-card comment window and classifies the newest ordinary comment after ignoring the ## Codex Workpad and Symphony-managed prerequisite comments. A Symphony-managed recheck status ends with the exact Managed by Symphony footer and a link to the qualifying blocker comment on the current card. Similar visible text, or a link to another card, remains an ordinary comment. Do not scan past a newer ordinary human comment to find an older blocker.

The newest ordinary comment qualifies only when its first non-blank line starts with Blocked: or Blocked by ..., matched without case sensitivity. A human discussion that merely contains the word blocked does not qualify.

Read the full file on GitHub · 218 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 218 lines · 41 tokens per session scan A 263c14ebcaaa

Subscribe to this mod's changes

trello-handoff is a skill published in the GitHub repository martin-francois/symphony-trello (2 stars, last pushed yesterday), licensed Apache-2.0. It adds 41 tokens to every session and 2,072 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.