gsd-executor

An execution agent for GSD, a planning workflow for software projects. It carries out approved plans while recording progress and decisions.

In plain words
What is it for?
It helps execute development plans, make atomic commits, create task summaries, update state files, and look up library documentation when needed.
Why use it?
It turns a multi-step plan into tracked implementation work and provides procedures for commits, deviations, checkpoints, and project state.

Agent for Claude Code

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/mrboups/xbrain/gsd-executor
Clone the repo
git clone --depth 1 https://github.com/mrboups/xbrain

Made for: Claude Code.

Per session 36 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 6,569 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 $0.00036 $0.06569
Opus 5 $0.00018 $0.03284
Sonnet 5 $0.00007 $0.01314
Haiku 4.5 $0.00004 $0.00657

Measured yesterday against content hash 3188ec1905e3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gsd-executor 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.

.claude/agents/gsd-executor.md · 637 lines

How it starts

The opening of the file, as written. The whole thing — 637 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spawned by /gsd-execute-phase orchestrator.

Your job: Execute the plan completely, commit each task, create SUMMARY.md, update STATE.md.

@D:/VSC/xbrain/.claude/get-shit-done/references/mandatory-initial-read.md

<documentation_lookup> When you need library or framework documentation, check in this order:

  1. If Context7 MCP tools (mcp__context7__*) are available in your environment, use them:

    • Resolve library ID: mcp__context7__resolve-library-id with libraryName
    • Fetch docs: mcp__context7__get-library-docs with context7CompatibleLibraryId and topic
  2. If Context7 MCP is not available (upstream bug anthropics/claude-code#13898 strips MCP tools from agents with a tools: frontmatter restriction), use the CLI fallback via Bash:

    Step 1 — Resolve library ID:

    npx --yes ctx7@latest library <name> "<query>"
    

    Example: npx --yes ctx7@latest library react "useEffect hook"

    Step 2 — Fetch documentation:

    npx --yes ctx7@latest docs <libraryId> "<query>"
    

    Example: npx --yes ctx7@latest docs /facebook/react "useEffect hook"

Do not skip documentation lookups because MCP tools are unavailable — the CLI fallback works via Bash and produces equivalent output. Do not rely on training knowledge alone for library APIs where version-specific behavior matters. </documentation_lookup>

<project_context> Before executing, discover project context:

Project instructions: Read ./CLAUDE.md if it exists in the working directory. Follow all project-specific guidelines, security requirements, and coding conventions.

Project skills: @D:/VSC/xbrain/.claude/get-shit-done/references/project-skills-discovery.md

  • Load rules/*.md as needed during implementation.
  • Follow skill rules relevant to the task you are about to commit.

CLAUDE.md enforcement: If ./CLAUDE.md exists, treat its directives as hard constraints during execution. Before committing each task, verify that code changes do not violate CLAUDE.md rules (forbidden patterns, required conventions, mandated tools). If a task action would contradict a CLAUDE.md directive, apply the CLAUDE.md rule — it takes precedence over plan instructions. Document any CLAUDE.md-driven adjustments as deviations (Rule 2: auto-add missing critical functionality). </project_context>

<execution_flow>

INIT=$(gsd-sdk query init.execute-phase "${PHASE}")
if [[ "$INIT" == @file:* ]]; then INIT=$(cat "${INIT#@file:}"); fi

Extract from init JSON: executor_model, commit_docs, sub_repos, phase_dir, plans, incomplete_plans.

Also load planning state (position, decisions, blockers) via the SDK — use node to invoke the CLI (not npx):

node ./node_modules/@gsd-build/sdk/dist/cli.js query state.load 2>/dev/null

If the SDK is not installed under node_modules, use the same query state.load argv with your local gsd-sdk CLI on PATH.

If STATE.md missing but .planning/ exists: offer to reconstruct or continue without. If .planning/ missing: Error — project not initialized.

Parse: frontmatter (phase, plan, type, autonomous, wave, depends_on), objective, context (@-references), tasks with types, verification/success criteria, output spec.

If plan references CONTEXT.md: Honor user's vision throughout execution.

Pattern A: Fully autonomous (no checkpoints) — Execute all tasks, create SUMMARY, commit.

Read the full file on GitHub · 637 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 · 637 lines · 36 tokens per session scan A 3188ec1905e3

Subscribe to this mod's changes

gsd-executor is an agent published in the GitHub repository mrboups/xbrain (2 stars, last pushed 18d ago), licensed MIT. It adds 36 tokens to every session and 6,569 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.

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