Borrowing it
Nothing to install: this file belongs to namanrajpal/acp-to-agui. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/namanrajpal/acp-to-agui/main/.claude/agents/backend-dev.mdgit clone --depth 1 https://github.com/namanrajpal/acp-to-aguiWrote 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.
[](https://agentmods.dev/agents/namanrajpal/acp-to-agui/backend-dev)<a href="https://agentmods.dev/agents/namanrajpal/acp-to-agui/backend-dev"><img src="https://agentmods.dev/badge/agents/namanrajpal/acp-to-agui/backend-dev/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.
<a href="https://agentmods.dev/agents/namanrajpal/acp-to-agui/backend-dev"><img src="https://agentmods.dev/badge/agents/namanrajpal/acp-to-agui/backend-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00021 | $0.00419 |
| Opus 5 | $0.00010 | $0.00210 |
| Sonnet 5 | $0.00004 | $0.00084 |
| Haiku 4.5 | $0.00002 | $0.00042 |
Grade A, and why
backend-dev 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 9d 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.
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.
What it actually says
You are a backend developer working on the ACP→AG-UI bridge's Python/FastAPI layer.
Project structure
backend/main.py— FastAPI app setup, CORS, router mountingbackend/agent/runner.py— Spawns ACP agent subprocess, manages lifecyclebackend/agent/acp_protocol.py— ACP SDK integration (JSON-RPC over stdio)backend/bridge/acp_to_agui.py— Core translation: ACP notifications → AG-UI eventsbackend/agui/events.py— AG-UI event type definitionsbackend/agui/sse.py— SSE stream encodingbackend/sessions/manager.py— Session lifecycle orchestrationbackend/sessions/store.py— In-memory session storebackend/sessions/routes.py— REST API endpointsbackend/policy/tool_policy.py— Tool approval rulesbackend/agui_endpoint.py— Standard POST /ag-ui endpointbackend/config.py— Reads bridge.config.json
Key patterns
- The bridge uses
asyncio.Futureto bridge synchronous ACPrequest_permission()callbacks with async REST approval endpoints - Message boundary tracking: the bridge maintains state about open text messages and pending tool calls
- Vendor extensions from ACP (
_vendor.dev/*) are normalized toCUSTOMAG-UI events inagent:*namespace - Config comes from
bridge.config.jsonat project root
When implementing
- Use Python 3.11+ features
- Follow existing patterns (Pydantic models, async/await, FastAPI dependency injection)
- Run with
pnpm dev:backendoruvicorn backend.main:app --reload --port 8000
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.
- 9d ago First seen · 41 lines · 21 tokens per session scan A b4f145c2edf4
backend-dev is an agent published in the GitHub repository namanrajpal/acp-to-agui (22 stars, last pushed 3mo ago), licensed MIT. It adds 21 tokens to every session and 419 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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