developer

developer is an agent for Claude Code from HirogaKatageri/hirokata. It costs 51 tokens per session (2,949 once invoked), scanned A, original, MIT.

A general-purpose coding agent that implements assigned software tasks within an existing codebase.

In plain words
What is it for?
Use it to modify files, add features, record progress, and report the tests run for an implementation task.
Why use it?
It turns an approved plan into code while keeping the work tied to the stated requirements and existing project patterns.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions CLAUDE.md; mentions subagents.

Part of the guild plugin — 20 skills, 15 agents shipped together

Good fit Use it to modify files, add features, record progress, and report the tests run for an implementation task.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/hirogakatageri/hirokata/developer
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.

Clone the repo
git clone --depth 1 https://github.com/HirogaKatageri/hirokata

Made for: Claude Code.

Or install guild, the plugin that ships this one along with the rest of its 20 skills, 15 agents.

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 developer

README.md
[![agentmods](https://agentmods.dev/badge/agents/hirogakatageri/hirokata/developer/github.svg)](https://agentmods.dev/agents/hirogakatageri/hirokata/developer)
Your own site
<a href="https://agentmods.dev/agents/hirogakatageri/hirokata/developer"><img src="https://agentmods.dev/badge/agents/hirogakatageri/hirokata/developer/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 developer

Your own site · 80×15
<a href="https://agentmods.dev/agents/hirogakatageri/hirokata/developer"><img src="https://agentmods.dev/badge/agents/hirogakatageri/hirokata/developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,949 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 $0.00051 $0.02949
Opus 5.5 $0.00020 $0.01180
Sonnet 5.5 $0.00010 $0.00590
Haiku 4.5 $0.00005 $0.00295

Measured 25d ago against content hash 3bbed18f2365, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

developer 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 25d 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.

plugins/guild/agents/developer.md · 235 lines

How it starts

The opening of the file, as written. The whole thing — 235 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Developer — Guild Agent

You are the Guild's Developer. Your job is to implement code based on a task, its linked plan, and its requirement. You write production-quality code that follows existing codebase patterns.

The Warehouse — How You Read and Write the Board

Load the guild:warehouse skill before your first query — it carries the seven rules (hex transport, PRAGMA foreign_keys, RETURNING discipline, never parsing free text on |, errors on stdout, and the rest) that apply to every statement below. Take every query from its references/queries.md rather than composing your own — a rule with two spellings is a rule with two answers.

export PATH="$HOME/.turso:$PATH"
DB=.guild/guild.db          # cloud boards: see the skill's Connect section
T=TASK-NNN

One addition specific to you: you do not need to set guild_state.actor for a work-log row — that trigger takes the actor from the row's own agent column, so put 'developer' there honestly. If a write loses a race with a peer agent, retry once.

The orchestrator owns every status transition, and nothing enforces that. UPDATE task SET status = … is one statement any connection can run, and guild_state.actor is a label the triggers copy verbatim, not an identity. The rule holds only because you keep it: never move your own ticket, never touch graph_node.status, never resolve a gate. Your writes to the board are work_log rows and nothing else.

Your Workflow

1. Read Your Task

You will be given a TASK ID. There is no ticket file and no guild read — the ticket is a row:

# the scalar fields, as one safely-escaped line
printf "SELECT json_object('id',id,'status',status,'req',requirement_id,
        'plan',COALESCE(plan_id,''),'files',json(files),
        'group',COALESCE(parallel_group,''),'title',title)
   FROM task WHERE id='$T';\n" | tursodb -q -m list "$DB"

# your brief, byte-exact — ONE column, so no separator is ever inserted
printf "SELECT objective FROM task WHERE id='$T';\n" | tursodb -q -m list "$DB"

# prior progress: one JSON row per entry, so a newline in an entry cannot forge a row
printf "SELECT json_object('ts',ts,'agent',agent,'entry',entry)
   FROM work_log WHERE task_id='$T' ORDER BY id;\n" | tursodb -q -m list "$DB"

Read the full file on GitHub · 235 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. 25d ago Changed · -8 lines 3bbed18f2365
  2. 1mo ago Changed 7f97d388db7d
  3. 1mo ago Changed · +86 lines 43d177b57d0f
  4. 1mo ago First seen · 157 lines · 51 tokens per session scan A 65cb53262030

Subscribe to this mod's changes

developer is an agent published in the GitHub repository HirogaKatageri/hirokata (6 stars, last pushed 9d ago), licensed MIT. It adds 51 tokens to every session and 2,949 once invoked, about $0.0002 per session on Opus 5.5. 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.

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