What is devtap CLAUDE.md?

Repository instructions for devtap, a Go tool that captures output and errors from development commands and makes them available to coding tools.

Use them when modifying devtap, running its unit or race-detection tests, checking integrations, linting the code, or understanding its storage and tool-delivery flow.

They give coding agents the exact build, test, integration-test, and lint commands, plus an overview of how devtap stores and delivers command output.

How tma1-ai/devtap configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to tma1-ai/devtap. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/tma1-ai/devtap/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/tma1-ai/devtap

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/tma1-ai/devtap/claude-md/github.svg)](https://agentmods.dev/instructions/tma1-ai/devtap/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/tma1-ai/devtap/claude-md"><img src="https://agentmods.dev/badge/instructions/tma1-ai/devtap/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/tma1-ai/devtap/claude-md"><img src="https://agentmods.dev/badge/instructions/tma1-ai/devtap/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,633 This file is loaded in full into every session.

When invoked 1,633 The same file — it is already loaded in full.

Security scan B 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.01633	$0.01633
Opus 5.5	$0.00653	$0.00653
Sonnet 5.5	$0.00327	$0.00327
Haiku 4.5	$0.00163	$0.00163

Measured 2mo ago against content hash 642ec7c628b4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

devtap CLAUDE.md scanned grade B with 1 finding 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 2mo 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

- **claudecode**: `.mcp.json` + optional Stop hook in `~/.claude/settings.json`

CLAUDE.md · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Build & Test Commands

# Build
go build ./cmd/devtap

# Test (unit only)
go test ./...

# Test with race detection (as CI runs)
go test ./... -race -count=1

# Run a single test
go test ./internal/store/file/ -run TestDrain

# Integration tests (requires local GreptimeDB on gRPC :4001, MySQL :4002)
go test -tags=integration ./internal/store/greptimedb/

# Lint
golangci-lint run ./...

Architecture

devtap captures stdout/stderr from build/dev commands and delivers them to AI coding tools via MCP (Model Context Protocol).

Data Flow

devtap -- <cmd>  →  capture (runner/longrun)  →  store.Write()  →  fan-out to all adapters
AI tool          ←  MCP server (get_build_errors) ←  store.Drain()  ←  per-adapter queue

Core Interfaces

Store (internal/store/store.go): Write/Drain/Status/Close. Two backends:

File (default): JSONL at ~/.devtap/<session>/<adapter>/pending.jsonl, atomic rename for IPC
GreptimeDB (optional): SQL queries + watermark cursor, tag is a reserved keyword and must be backtick-quoted in all SQL

Adapter (internal/adapter/adapter.go): Name/DiscoverSessions/Install. Five implementations:

claudecode: .mcp.json + optional Stop hook in ~/.claude/settings.json
codex: .codex/config.toml
opencode: opencode.json
gemini: .gemini/settings.json
aider: lint wrapper script (no MCP)

Key Patterns

Multi-adapter fan-out: Writers discover adapters via store.DiscoverAdapters(), write to all. Each tool drains independently.
Multi-source drain: MCP server and drain command can read from up to 2 sources (local + configured remote). resolveDrainSources() in cmd/devtap/storefactory.go resolves sources and deduplicates when (backend, session) match. Messages are merged, deduplicated via mcp.DedupMessages(), and labeled with [host session] prefix in multi-source mode.
Drain budget unit: Store.Drain(sessionID, maxLines) treats maxLines as a message count (not line count). The multi-source loop tracks remaining budget in messages. Line-level truncation is a separate pass via mcp.TruncateMessages().
Host field: LogMessage.Host is set via cached os.Hostname() at capture startup. Used for multi-source origin labeling. GreptimeDB uses COALESCE(host, '') for backward compat with pre-existing rows.
File store IPC: pending.jsonl → atomic rename to pending.jsonl.draining → read → delete. Leftover lines written back to prevent data loss.
Config merge: .mcp.json / settings.json / opencode.json reads existing → upserts devtap entry → writes back. Never overwrites other tools' config.
Instruction injection: Appends `

Read the full file on GitHub · 119 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.

2mo ago First seen · 119 lines · 1,633 tokens per session scan B 642ec7c628b4

Subscribe to this mod's changes

devtap CLAUDE.md is an instructions file published in the GitHub repository tma1-ai/devtap (13 stars, last pushed 8mo ago), licensed MIT. It adds 1,633 tokens to every session, about $0.0065 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude Code ai-coding aider build-tools cli codex

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

devtap: Instructions file for Claude Code