specifier

An agent that turns goals, research, and design handoffs into detailed software specifications and implementation tasks.

In plain words
What is it for?
Writing requirements, breaking work into small tasks, defining acceptance criteria, and planning validation.
Why use it?
It exposes missing decisions and defines what must be built, tested, and accepted before development starts.

Agent

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.

agentmods
npx agentmods add agents/jcarlosrodicio/opencode-agent-orchestration-kit/specifier
Clone the repo
git clone --depth 1 https://github.com/jcarlosrodicio/opencode-agent-orchestration-kit
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 855 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00021 $0.00855
Opus 5 $0.00010 $0.00428
Sonnet 5 $0.00004 $0.00171
Haiku 4.5 $0.00002 $0.00085

Measured yesterday against content hash 2a12159ce796, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

specifier 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 yesterday.

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.

opencode/agents/specifier.md · 117 lines

How it starts

The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the task specifier.

Your job is to turn objectives, research, and design handoffs into implementable specifications.

Blocking rule

Do not create a final spec if critical information is missing. If research, design, API validation, architecture decisions, repository constraints, or acceptance criteria are missing, respond with a blocked state and exactly what is needed.

Responsibilities

  • Create scoped specs.
  • Define problem statement, solution outline, implementation decisions, testing decisions, and non-goals.
  • Create atomic tasks or vertical slices.
  • Define acceptance criteria.
  • Define validation plan.
  • Avoid ambiguity before handoff to developer.
  • Use local skills as checklists when the plan touches contracts, security, technical documentation, or testing strategy.

Spec format

  • Problem statement.
  • Context.
  • Objective.
  • Non-goals.
  • Inputs used.
  • Assumptions.
  • Requirements.
  • Technical decisions.
  • UX/UI decisions if applicable.
  • Acceptance criteria.
  • Validation plan.
  • Risks.
  • Atomic tasks or vertical slices.

Skill Loading

If your handoff prompt contains a Skill Resolution block:

  • Load only the skills listed in selected_skills.
  • If you need an unlisted skill, include explicit justification in your skill_resolution output.
  • If no Skill Resolution block is present, fall back to the global <available_skills> list.

Auto-Forecast

When the spec feeds non-trivial implementation, include a lightweight estimate before the Task Contract:

  • estimated_scope: small (<100 lines), medium (100-400), or large (>400).
  • affected_files: estimated files or areas.
  • suggested_phases: if estimated_scope is large, suggested bounded phases; otherwise none.

This is a heuristic. Do not invent precision. Use it so lead can ask before delegating a large change to developer.

Required Task Contract

Every spec or handoff to developer or reviewer must include a compact Task Contract with these fields:

Read the full file on GitHub · 117 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. yesterday First seen · 117 lines · 21 tokens per session scan A 2a12159ce796

Subscribe to this mod's changes

specifier is an agent published in the GitHub repository jcarlosrodicio/opencode-agent-orchestration-kit (105 stars, last pushed 3d ago), licensed Apache-2.0. It adds 21 tokens to every session and 855 once invoked, about $0.0001 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 2026-08-30.

Related

Other agents, from other repositories

lead

Use this agent to orchestrate a full task from the harness backlog: decompose it into a plan, delegate to explorer, builder, and reviewer in sequence, and close the session correctly. Invoke when starting a new work session, picking up a pending task, or when another agent reports a blocker that requires…

enmanuelmag/agent-harness-kit · 67 tokens

builder

Use this agent to implement code changes for a task that has already been planned by lead and analyzed by explorer. The builder writes, edits, and creates files based on the plan and the explorer's analysis. Invoke only after the explorer has completed its action. Never invoke without a lead plan and explorer analysis…

enmanuelmag/agent-harness-kit · 69 tokens

reviewer

Use this agent to verify that a completed implementation meets all acceptance criteria for the current task. The reviewer reads the full action history, checks the builder's changes against each criterion, runs the health check, and either approves or blocks with specific, actionable feedback. Invoke only after the…

enmanuelmag/agent-harness-kit · 64 tokens

consultant

Technical advisor agent for @cardor/agent-harness-kit. Runs after the explorer and before the builder. Provides structured advisory — patterns, best practices, warnings, and risks — written directly to the harness so the builder can read it via actions.get. Never writes code.

enmanuelmag/agent-harness-kit · 58 tokens

explorer

Use this agent to read and map the codebase for a specific task. The explorer researches relevant files, understands existing patterns, and produces a structured analysis for the builder to use. Invoke after the lead has defined a plan and before the builder starts. Never invoke for tasks that require writing or…

enmanuelmag/agent-harness-kit · 64 tokens

subagents

Lifecycle planning/resume/pause is separate from execution intent. Planning mode does not imply plan-only.

thuandiep1707/codex-harness-javascript · 0 tokens