pi-agentrouter

A Pi coding agent extension that registers AgentRouter as a custom provider with both OpenAI Completions and Anthropic Messages API protocols:

Models

OpenAI Compatible (agentrouter/) — https://agentrouter.org/v1

| Model | Context | Input | |---|---|---| | agentrouter/gpt-5.6-sol | 272k | text, image | | agentrouter/deepseek-v4-flash | 131k | text, image | | agentrouter/glm-5.3 | 131k | text, image |

Anthropic Messages (agentrouter-anthropic/) — https://agentrouter.org

| Model | Context | Input | |---|---|---| | agentrouter-anthropic/claude-opus-4-8 | 200k | text, image | | agentrouter-anthropic/claude-opus-5 | 200k | text, image |

All models are reasoning-capable with low/medium/high/xhigh thinking level mappings.

Install

pi install npm:@bismawy/pi-agentrouter

Alternatively, straight from GitHub:

pi install git:github.com/bismawy/pi-agentrouter

Setup

No API key is hardcoded into the extension — supply yours via:

1. Environment variable: export AGENTROUTER_API_KEY="your-api-key"
2. /login agentrouter (or /login agentrouter-anthropic) in Pi
3. models.json under providers.agentrouter.apiKey

Then run /model and pick your desired model.

Features & Fixes

• Separate Endpoints & Protocols: Automatically splits Claude (Anthropic Messages protocol with Claude Code wire image) and OpenAI/GLM/DeepSeek (OpenAI Completions protocol).
• Canonical Pi header (WAF): AgentRouter authorizes Pi traffic only when the system prompt starts with You are an expert coding assistant operating inside pi.... On the first turn, project AGENTS.md often lands in front of that line → 400 content-blocked. This extension moves the header to byte 0 (same approach as @madgagarin/pi-agentrouter).
• Language framing on the first user turn (non-English prompts).
• Payload sanitization: ANSI / control chars / lone surrogates.
• sendSessionAffinityHeaders: true preserves session affinity for prompt cache hits.