openclaw - 💡(How to fix) Fix [Bug]: Compaction fails with 404 when using anthropic-vertex provider — URL routing mismatch [1 participants]

openclaw2026-04-08 18:04:26

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openclaw/openclaw#63287•Fetched 2026-04-09 07:55:51

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joshuarandall

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joshuarandall

Compaction summarization fails with a 404 error when the primary or compaction model uses the anthropic-vertex provider. The compaction code path routes through completeSimple() → anthropic-messages API provider → appends /v1/messages to the Vertex base URL, which returns a Google 404 page. Normal chat streaming works because it uses the AnthropicVertex SDK override.

Error Message

Compaction failed: Summarization failed: 404 <!DOCTYPE html>
<html lang=en>
<title>Error 404 (Not Found)!!1</title>
...
The requested URL <code>/v1/messages</code> was not found on this server.

Root Cause

The issue is a URL routing mismatch between the main streaming path and the compaction summarization path:

Fix Action

Workaround

Set agents.defaults.compaction.model to a non-Vertex model:

{
  "agents": {
    "defaults": {
      "compaction": {
        "model": "your-local-provider/some-model"
      }
    }
  }
}

This routes compaction through a provider that uses standard OpenAI-compatible endpoints, avoiding the Vertex URL mismatch entirely. Summarization doesn't require a frontier model.

Code Example

Compaction failed: Summarization failed: 404 <!DOCTYPE html>
<html lang=en>
<title>Error 404 (Not Found)!!1</title>
...
The requested URL <code>/v1/messages</code> was not found on this server.

---

pi-embedded-CNTNdlGw.js:24114
→ if (params.model.provider === "anthropic-vertex") return createAnthropicVertexStreamFnForModel(params.model)
→ new AnthropicVertex({ region, projectId })  // from @anthropic-ai/vertex-sdk
→ Correctly builds: https://us-east5-aiplatform.googleapis.com/v1/projects/{project}/locations/{region}/publishers/anthropic/models/{model}:rawPredict

---

compaction.js → generateSummary() → completeSimple()
→ @mariozechner/pi-ai/dist/stream.js → resolveApiProvider(model.api)
→ model.api = "anthropic-messages" → registers streamAnthropic / streamSimpleAnthropic
→ @mariozechner/pi-ai/dist/providers/anthropic.js → uses standard Anthropic SDK
→ Constructs: ${model.baseUrl}/v1/messages
→ https://us-east5-aiplatform.googleapis.com/v1/messages → 404

---

{
  "agents": {
    "defaults": {
      "compaction": {
        "model": "your-local-provider/some-model"
      }
    }
  }
}

RAW_BUFFERClick to expand / collapse

[Bug]: Compaction fails with 404 when using `anthropic-vertex` provider — URL routing mismatch

Summary

Version

OpenClaw 2026.4.8 (9ece252)

Environment

OS: macOS 15 (arm64), Mac Studio M4 Max
Model: anthropic-vertex/claude-opus-4-6
Auth: Service Account ADC (GOOGLE_APPLICATION_CREDENTIALS)
Region: us-east5 (via GOOGLE_CLOUD_LOCATION)
Install: npm (global)

Steps to Reproduce

Configure anthropic-vertex as your primary model provider
Set agents.defaults.compaction.model to anthropic-vertex/claude-opus-4-6 (or leave it defaulting to the primary model)
Accumulate enough context to trigger compaction, or run /compact
Compaction fails with 404

Error

Compaction failed: Summarization failed: 404 <!DOCTYPE html>
<html lang=en>
<title>Error 404 (Not Found)!!1</title>
...
The requested URL <code>/v1/messages</code> was not found on this server.

Root Cause Analysis

The issue is a URL routing mismatch between the main streaming path and the compaction summarization path:

Main streaming (WORKS):

pi-embedded-CNTNdlGw.js:24114
→ if (params.model.provider === "anthropic-vertex") return createAnthropicVertexStreamFnForModel(params.model)
→ new AnthropicVertex({ region, projectId })  // from @anthropic-ai/vertex-sdk
→ Correctly builds: https://us-east5-aiplatform.googleapis.com/v1/projects/{project}/locations/{region}/publishers/anthropic/models/{model}:rawPredict

Compaction summarization (BROKEN):

compaction.js → generateSummary() → completeSimple()
→ @mariozechner/pi-ai/dist/stream.js → resolveApiProvider(model.api)
→ model.api = "anthropic-messages" → registers streamAnthropic / streamSimpleAnthropic
→ @mariozechner/pi-ai/dist/providers/anthropic.js → uses standard Anthropic SDK
→ Constructs: ${model.baseUrl}/v1/messages
→ https://us-east5-aiplatform.googleapis.com/v1/messages → 404

The AnthropicVertex SDK override that correctly handles Vertex URL construction is only applied in the main agent streaming loop (createBoundaryAwareStreamFnForModel / registerProviderStreamForModel), not in the completeSimple() path used by compaction.

Key files:

dist/pi-embedded-CNTNdlGw.js line 24114 — streaming override (works)
dist/anthropic-vertex-stream-BGBzq7ah.js — AnthropicVertex client creation
dist/provider-catalog-Dh2qD5Tx.js line 49 — base URL construction
node_modules/@mariozechner/pi-coding-agent/dist/core/compaction/compaction.js — generateSummary()
node_modules/@mariozechner/pi-ai/dist/stream.js — completeSimple() routing

Suggested Fix

The anthropic-messages API provider registration (in register-builtins.js) needs to be aware of Vertex routing, OR completeSimple() needs to check for model.provider === "anthropic-vertex" and route through the AnthropicVertex SDK, the same way the main streaming path does.

Workaround

Set agents.defaults.compaction.model to a non-Vertex model:

{
  "agents": {
    "defaults": {
      "compaction": {
        "model": "your-local-provider/some-model"
      }
    }
  }
}

This routes compaction through a provider that uses standard OpenAI-compatible endpoints, avoiding the Vertex URL mismatch entirely. Summarization doesn't require a frontier model.

Impact

High — Compaction is completely broken for anyone using anthropic-vertex as their primary provider without a model override. Sessions that hit the compaction threshold will fail silently and the error surfaces as a system notification.

extent analysis

TL;DR

The most likely fix for the compaction failure with a 404 error when using the anthropic-vertex provider is to modify the completeSimple() path to route through the AnthropicVertex SDK for Vertex models.

Guidance

Identify the completeSimple() function in stream.js and add a conditional check for model.provider === "anthropic-vertex" to route through the AnthropicVertex SDK.
Update the anthropic-messages API provider registration in register-builtins.js to be aware of Vertex routing.
As a temporary workaround, set agents.defaults.compaction.model to a non-Vertex model to avoid the URL mismatch.
Verify the fix by triggering compaction and checking for successful summarization.

Example

// Update agents.defaults.compaction.model to a non-Vertex model as a workaround
{
  "agents": {
    "defaults": {
      "compaction": {
        "model": "your-local-provider/some-model"
      }
    }
  }
}

Notes

The provided fix assumes that the AnthropicVertex SDK override is correctly handling Vertex URL construction. If issues persist, further investigation into the SDK and its integration with the completeSimple() path may be necessary.

Recommendation

Apply the workaround by setting agents.defaults.compaction.model to a non-Vertex model, as this provides a temporary solution to avoid the URL mismatch and allows for successful compaction and summarization.

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openclaw - 💡(How to fix) Fix [Bug]: Compaction fails with 404 when using anthropic-vertex provider — URL routing mismatch [1 participants]

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Error Message

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Fix Action

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Code Example

[Bug]: Compaction fails with 404 when using `anthropic-vertex` provider — URL routing mismatch

Summary

Version

Environment

Steps to Reproduce

Error

Root Cause Analysis

Main streaming (WORKS):

Compaction summarization (BROKEN):

Key files:

Suggested Fix

Workaround

Impact

extent analysis

TL;DR

Guidance

Example

Notes

Recommendation

Still need to ship something?

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openclaw - 💡(How to fix) Fix [Bug]: Compaction fails with 404 when using anthropic-vertex provider — URL routing mismatch [1 participants]

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Error Message

Root Cause

Fix Action

Workaround

Code Example

[Bug]: Compaction fails with 404 when using anthropic-vertex provider — URL routing mismatch

Summary

Version

Environment

Steps to Reproduce

Error

Root Cause Analysis

Main streaming (WORKS):

Compaction summarization (BROKEN):

Key files:

Suggested Fix

Workaround

Impact

extent analysis

TL;DR

Guidance

Example

Notes

Recommendation

Still need to ship something?

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[Bug]: Compaction fails with 404 when using `anthropic-vertex` provider — URL routing mismatch