model.request hook baseURL is ignored for models loaded through the AI SDK adapter #55984

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1. opencode-agent commented on Oct 16, 2026

   

   opencode-agentBot

   on Oct 16, 2026 – with OpenCode Agent

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   Thanks for the precise report. I reproduced this with your url-probe plugin and the aisdk:file:// openai-compatible provider config. On 2.0.30, opencode --print-logs run --standalone --model probe/m Hi logs PROBE https://original.example.invalid/v1/chat/completions for every request, so the baseURL set in model.request is ignored. It still happens on the latest dev (37e3912d8). The script below reproduces it (set OC_DEV=<checkout> to run from source).

   This matches your reading of the code: the AI SDK route's with returns the same route, so the override is dropped.

   Related, but not the same problem:

   • [FEATURE]: Plugins can't intercept outbound requests for AI-SDK models (http.request hook excludes the AI-SDK path) #42846: the http.request hook not covering AI SDK models (closed)
   • Plugin aisdk "sdk" hooks never run when the provider package is not on npm #42788: AI SDK sdk hooks not running for providers that aren't on npm

   Reproduction script (repro.sh)

   #!/usr/bin/env bash
   # Reproduces #55984: model.request hook's baseURL ignored for AI SDK models.
   # Usage: ./repro.sh            (uses `opencode` from PATH)
   #        OC_DEV=/path/to/repo ./repro.sh  (runs from source checkout)
   set -euo pipefail
   DIR=${DIR:-/tmp/opencode/probe}
   rm -rf "$DIR"; mkdir -p "$DIR/url-probe"
   cd "$DIR"
   cat > url-probe/server.ts <<'TS'
   import { Plugin } from "@opencode/plugin"
   export default Plugin.define({ id: "url-probe", async setup(ctx) {
     await ctx.session.hook("model.request", (e) => { e.baseURL = "https://replacement.example.invalid/v1" })
     await ctx.session.hook("http.request", (e) => { console.error("PROBE", e.request.url); e.request = new Request("data:,", e.request) })
   }})
   TS
   npm init -y >/dev/null
   npm i -s @ai-sdk/openai-compatible >/dev/null 2>&1
   cat > opencode.jsonc <<JSON
   {"plugins":["./url-probe"],"providers":{"probe":{"package":"aisdk:file://$DIR/node_modules/@ai-sdk/openai-compatible/dist/index.js","settings":{"baseURL":"https://original.example.invalid/v1","apiKey":"x"},"models":{"m":{"limit":{"context":200000,"output":4096}}}}}}
   JSON
   git init -q .
   if [ -n "${OC_DEV:-}" ]; then
     # the spawned standalone server needs the solid preload too; bun reads it from ./bunfig.toml
     echo "preload = [\"$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js\"]" > bunfig.toml
     OC=(bun --conditions=browser --preload="$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js" "$OC_DEV/packages/cli/src/index.ts")
   else
     OC=(opencode)
   fi
   "${OC[@]}" --version
   timeout 90 "${OC[@]}" --print-logs run --standalone --model probe/m Hi 2>&1 | grep -E "PROBE|error|Error" | head -20 || true

   Run it: bash repro.sh
2. opencode-agent

   added

   reproduced

   on Oct 16, 2026