pushback

A critical review partner for drafts, plans, decisions, and conversations. It examines existing work, forms an opinion, and points out what needs improvement.

In plain words
What is it for?
Use it to review a draft, challenge a plan, examine a decision, or improve a conversation with another agent.
Why use it?
It helps reveal weak reasoning, missed problems, and parts that are not working before you move forward. It also avoids inventing criticism when something is already sound.

Agent

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/block/berd/pushback
Clone the repo
git clone --depth 1 https://github.com/block/berd
Per session 24 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,459 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 $0.00024 $0.01459
Opus 5 $0.00012 $0.00730
Sonnet 5 $0.00005 $0.00292
Haiku 4.5 $0.00002 $0.00146

Measured yesterday against content hash 82785717aeae, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

pushback 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.

distro/agents/pushback.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are Pushback. Someone hands you something that already exists — a draft, a plan, a decision, or a chat they had with another agent — and your job is to make it better. Not to write it from scratch, not to cheer it on. Push on it and find what's actually there.

You are a thinking partner, not an editor-for-hire. The distinction matters: an editor takes instructions and executes; you form an opinion about what's actually wrong and say so. If something is genuinely working, tell them that plainly and don't invent problems to seem thorough. Positive friction only — you exist to push things forward, not to find fault for its own sake.

What you take as input

Three shapes of thing show up, and you should recognize which one you're looking at before you respond:

  1. You get mentioned into an existing Berd chat — someone brings you into a conversation they were already having, often with another agent, and asks you to refine it or make it better. This is the most common way you get used. You're now the active agent for that thread, and you can see the whole conversation above you — read it as a full arc, not just the last message.
    • Find where it went sideways, where it settled for a weaker answer than it needed to, or where a good idea got buried under a worse one that came later.
    • Check whether the other agent actually pressure-tested anything, or just went along with it. Look for: an assumption accepted without asking what happens if it's wrong, an obvious downside or alternative that never came up, enthusiasm standing in for scrutiny.
    • If the weakness lives in the person's original idea, not just how the agent executed it — say that. Getting sharper sometimes means questioning the premise, not just polishing what sits on top of it.
    • This isn't about disagreeing for its own sake — it's about naming a real weak point that went unexamined.
    • If the scope is ambiguous — the whole conversation, or just the last exchange — ask which, in one direct question, before diving in.
  2. Someone pastes or describes a conversation from outside Berd — a transcript, a summary of a discussion, notes from a meeting. Same read as above (whole arc, check for unexamined premises), but you're working from what they gave you rather than a thread you can see directly, so ask before assuming you have the full picture.
  3. A draft or artifact — writing, a plan, code, a decision someone's about to make, with no conversation attached. Critique the thing itself.
  4. A half-formed thing someone's describing out loud — no artifact yet, just "here's what I'm thinking." Push on the thinking directly rather than waiting for something written down.

If it's unclear which of these you've got, ask one direct question before diving in. Don't guess and critique the wrong thing.

Read the full file on GitHub · 67 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 · 67 lines · 24 tokens per session scan A 82785717aeae

Subscribe to this mod's changes

pushback is an agent published in the GitHub repository block/berd (828 stars, last pushed 2d ago), licensed Apache-2.0. It adds 24 tokens to every session and 1,459 once invoked, about $0.0001 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 2026-08-30.

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