gsd-forensics

gsd-forensics is a skill for Codex from lalitnayyar/finally. It costs 29 tokens per session (995 once invoked), scanned A, a copy of gsd-forensics, MIT.

A post-mortem investigation tool for failed GSD workflows. A post-mortem examines what happened after a failure to find its cause.

In plain words
What is it for?
Use it to investigate why a GSD workflow failed and document the diagnosis.
Why use it?
It helps replace guesswork with evidence from the project's Git history, saved work files, and workflow state.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: names the AskUserQuestion tool; mentions Claude Code; mentions Codex.

Good fit Use it to investigate why a GSD workflow failed and document the diagnosis.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lalitnayyar/finally/gsd-forensics
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add lalitnayyar/finally --skill gsd-forensics
Clone the repo
git clone --depth 1 https://github.com/lalitnayyar/finally

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 gsd-forensics

README.md
[![agentmods](https://agentmods.dev/badge/skills/lalitnayyar/finally/gsd-forensics/github.svg)](https://agentmods.dev/skills/lalitnayyar/finally/gsd-forensics)
Your own site
<a href="https://agentmods.dev/skills/lalitnayyar/finally/gsd-forensics"><img src="https://agentmods.dev/badge/skills/lalitnayyar/finally/gsd-forensics/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 gsd-forensics

Your own site · 80×15
<a href="https://agentmods.dev/skills/lalitnayyar/finally/gsd-forensics"><img src="https://agentmods.dev/badge/skills/lalitnayyar/finally/gsd-forensics.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 995 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 88% copy Near-identical to another mod 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 $0.00029 $0.00995
Opus 5.5 $0.00012 $0.00398
Sonnet 5.5 $0.00006 $0.00199
Haiku 4.5 $0.00003 $0.00100

Measured 13d ago against content hash 69e72ec55fdc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gsd-forensics 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 13d 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.

Origin

This is a copy

88% identical to gsd-forensics — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.codex/skills/gsd-forensics/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<codex_skill_adapter>

A. Skill Invocation

  • This skill is invoked by mentioning $gsd-forensics.
  • Treat all user text after $gsd-forensics as {{GSD_ARGS}}.
  • If no arguments are present, treat {{GSD_ARGS}} as empty.

B. AskUserQuestion → request_user_input Mapping

GSD workflows use AskUserQuestion (Claude Code syntax). Translate to Codex request_user_input:

Parameter mapping:

  • header → header
  • question → question
  • Options formatted as "Label" — description → {label: "Label", description: "description"}
  • Generate id from header: lowercase, replace spaces with underscores

Batched calls:

  • AskUserQuestion([q1, q2]) → single request_user_input with multiple entries in questions[]

Multi-select workaround:

  • Codex has no multiSelect. Use sequential single-selects, or present a numbered freeform list asking the user to enter comma-separated numbers.

Execute mode fallback:

  • When request_user_input is rejected (Execute mode), present a plain-text numbered list and pick a reasonable default.

C. Task() → spawn_agent Mapping

GSD workflows use Task(...) (Claude Code syntax). Translate to Codex collaboration tools:

Direct mapping:

  • Task(subagent_type="X", prompt="Y") → spawn_agent(agent_type="X", message="Y")
  • Task(model="...") → omit (Codex uses per-role config, not inline model selection)
  • fork_context: false by default — GSD agents load their own context via <files_to_read> blocks

Parallel fan-out:

  • Spawn multiple agents → collect agent IDs → wait(ids) for all to complete

Result parsing:

  • Look for structured markers in agent output: CHECKPOINT, PLAN COMPLETE, SUMMARY, etc.
  • close_agent(id) after collecting results from each agent </codex_skill_adapter>

Purpose: Diagnose failed or stuck workflows so the user can understand root cause and take corrective action. Output: Forensic report saved to .planning/forensics/, presented inline, with optional issue creation.

Read the full file on GitHub · 91 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. 13d ago First seen · 91 lines · 29 tokens per session scan A 69e72ec55fdc

Subscribe to this mod's changes

gsd-forensics is a skill published in the GitHub repository lalitnayyar/finally (0 stars, last pushed 6mo ago), licensed MIT. It adds 29 tokens to every session and 995 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to gsd-forensics, differing in 4 lines, and is treated as a copy.

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