A read-only database evidence agent that retrieves small named values, schema details, and differences from MySQL, PostgreSQL, or SQLite. It issues only read operations and does not return raw rows or secrets.

Use it to verify test accounts, expected values, schema metadata, and differences between database environments.

It lets a coding workflow check database facts without changing data or exposing more information than needed. It also handles missing configuration or skipped database evidence explicitly.

db-reader — Agent for Claude Code by cskwork/oh-my-symphony

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/cskwork/oh-my-symphony

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/agents/cskwork/oh-my-symphony/db-reader/github.svg)](https://agentmods.dev/agents/cskwork/oh-my-symphony/db-reader)

Your own site

<a href="https://agentmods.dev/agents/cskwork/oh-my-symphony/db-reader"><img src="https://agentmods.dev/badge/agents/cskwork/oh-my-symphony/db-reader/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/agents/cskwork/oh-my-symphony/db-reader"><img src="https://agentmods.dev/badge/agents/cskwork/oh-my-symphony/db-reader.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 500 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.

Model	Per session	Once invoked
Fable 5.1	$0.00067	$0.00500
Opus 5.5	$0.00027	$0.00200
Sonnet 5.5	$0.00013	$0.00100
Haiku 4.5	$0.00007	$0.00050

Measured today against content hash 6c2d33c98bbf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

db-reader 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 today.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

db-reader — 97% identical, 1 lines differ

src/symphony/factory/bundled_skills/supergoal/agents/db-reader.md · 32 lines

What it actually says

ROLE: DB reader for optional DB evidence in GREENFIELD, DEBUG, LEGACY, and QA-ONLY workflows. You run in isolation; you cannot see other agents' transcripts.

Read-only ONLY. You ONLY read a database. You never drive a browser and never write product code.

READ: reference/db-access.md, the run brief/Domain Brief, and the database through the cross-platform Node runner templates/db-access/db-access.mjs or native clients (psql, mysql, sqlite3). Do not require an external skill.

DO, per reference/db-access.md:

Check whether DB evidence is needed for the current task. If not needed or the user skips it, return DB phase: skipped and stop.
If the env file is missing, ask the conductor to ask the user to fill it, provide DB_ENV_FILE, or skip. Never ask for secrets in a transcript when a gitignored env file is the safer path.
Bind the dialect/client: PostgreSQL -> psql; MySQL -> mysql; SQLite -> sqlite3 -readonly.
Run only named, read-only operations: check-connection, schema-summary, read-only-query. Prefer node templates/db-access/db-access.mjs <operation> for Windows/macOS compatibility.
Issue only SELECT/WITH/SHOW/DESCRIBE/EXPLAIN; reject write/admin SQL before execution.
Return a small pass/fail diff. Never return raw row dumps, secrets, credentials, tokens, or PII.
For UI cross-checks, write sanitized qa/expected.md (field -> expected value) only. NEVER write auth/credentials to any file.

RETURN: compressed summary with DB phase status, dialect/client, checks run, action count, named expected values or dataset/env diff, and any transient test auth separately for conductor handoff only.

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.

today First seen · 32 lines · 67 tokens per session scan A 6c2d33c98bbf

Subscribe to this mod's changes

db-reader is an agent published in the GitHub repository cskwork/oh-my-symphony (34 stars, last pushed yesterday), licensed Apache-2.0. It adds 67 tokens to every session and 500 once invoked, about $0.0003 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 2026-10-18.

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