Pynchy Development

A development guide for working on Pynchy, the application and agent system. It covers local commands, isolated feature runtimes, host checks, and finding current library documentation.

In plain words
What is it for?
Running the app and tests, linting and formatting code, running repository hooks, rebuilding the agent container, checking agent traces, and using managed feature runtimes.
Why use it?
It reduces guesswork about which commands and environment to use when testing, formatting, rebuilding, or debugging Pynchy.

Skill for Claude CodeCodex

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 skills/crypdick/pynchy/pynchy-dev
Any agent
npx skills add crypdick/pynchy --skill pynchy-dev
Clone the repo
git clone --depth 1 https://github.com/crypdick/pynchy

Made for: Claude Code, Codex.

Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,036 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 $0.00079 $0.01036
Opus 5 $0.00039 $0.00518
Sonnet 5 $0.00016 $0.00207
Haiku 4.5 $0.00008 $0.00104

Measured yesterday against content hash 6499cd93393a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Pynchy Development 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/skills/pynchy-dev/SKILL.md · 78 lines

How it starts

The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pynchy Development

Run commands directly—don't tell the user to run them.

Am I on pynchy?

Check hostname and compare it with the deployment-specific live host from local memory, environment, or the operator. If you are on that host, access services at localhost. Otherwise, reach Pynchy over SSH or Tailscale using that configured host.

Commands

uv run pynchy            # Run the app
uv run pytest tests/     # Run tests
uv run ruff check --fix src/  # Lint + autofix
uv run ruff format src/       # Format
uvx prek run --all-files  # Run all repository hooks
./src/pynchy/agent/build.sh     # Rebuild agent container

Isolated feature runtimes

Use new-feature from the control checkout when a feature needs an isolated Pynchy runtime. See the feature-runtime workflow for create, merge, restart, and teardown commands. Do not use raw git worktree commands for managed features. Install or verify its host dependencies with ./scripts/install_new_feature_dependencies.py.

Documentation Lookup

When you need documentation for a library or framework, use the context7 MCP server to get up-to-date docs. Don't rely on training data for API details that may have changed.

Testing Philosophy

Write tests that validate actual business logic, not just line coverage. See references/testing-philosophy.md for what makes a good test vs. coverage theater.

Known Issues

  • Transcript branching is closed by construction, not to be reopened casually — native Teams tools (TeamCreate/TeamDelete/SendMessage) are not allow-listed in either core, so nothing can branch the leader's session transcript. Task sidechains remain allowed (they write off the main chain and resume safely). Reintroducing Teams requires per-teammate session isolation first — tracked in backlog/0-proposed/reintroduce-teams-session-isolation.md.

Read the full file on GitHub · 78 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 78 lines · 79 tokens per session scan A 6499cd93393a

Subscribe to this mod's changes

Pynchy Development is a skill published in the GitHub repository crypdick/pynchy (10 stars, last pushed 7d ago), licensed MIT. It adds 79 tokens to every session and 1,036 once invoked, about $0.0004 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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