LiteLLM / LiteLLM

LiteLLM A2A Endpoint Returns 'Stream Consumed' Error on JSON-RPC POST

Fix LiteLLM A2A /a2a/{id}/message/send returning -32603 Stream consumed error Includes evidence for LiteLLM troubleshooting demand.

Source-backed Last updated May 14, 2026 1 source Needs local verification

Category: LiteLLM
Error signature: -32603 Internal error: Stream consumed
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 14, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for LiteLLM, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

-32603 Internal error: Stream consumed is a LiteLLM failure pattern reported for developers trying to fix litellm a2a /a2a/{id}/message/send returning -32603 stream consumed error. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Bug report on BerriAI/litellm repo: POST /a2a/{agent_id}/message/send returns {"jsonrpc":"2.0","id":null,"error":{"code":-32603,"message":"Internal error: Stream consumed"}}. Affects LiteLLM main branch as of 2026-05-13 on Docker image ghcr.io/berriai/litellm-non_root:main-stable.

Common causes

LiteLLM's A2A (Agent-to-Agent) endpoints return a JSON-RPC 2.0 error 'Stream consumed' when invoked via raw HTTP POST. This blocks developers building multi-agent systems that rely on the A2A protocol through LiteLLM proxy.
Bug report on BerriAI/litellm repo: POST /a2a/{agent_id}/message/send returns {"jsonrpc":"2.0","id":null,"error":{"code":-32603,"message":"Internal error: Stream consumed"}}. Affects LiteLLM main branch as of 2026-05-13 on Docker image ghcr.io/berriai/litellm-non_root:main-stable.

Quick fixes

Confirm the exact error signature matches -32603 Internal error: Stream consumed.
Check the LiteLLM account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match -32603 Internal error: Stream consumed exactly before applying the quick fix.
Compare the failing environment with LiteLLM versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does -32603 Internal error: Stream consumed mean in LiteLLM?

-32603 Internal error: Stream consumed indicates the workflow described by "LiteLLM A2A Endpoint Returns 'Stream Consumed' Error on JSON-RPC POST" failed in a LiteLLM context. Start by confirming the exact signature and the component that emitted it.

What should I check first for -32603 Internal error: Stream consumed?

Check whether this cause matches your environment: LiteLLM's A2A (Agent-to-Agent) endpoints return a JSON-RPC 2.0 error 'Stream consumed' when invoked via raw HTTP POST. This blocks developers building multi-agent systems that rely on the A2A protocol through LiteLLM proxy.

Is the -32603 Internal error: Stream consumed guidance source-backed?

The "LiteLLM A2A Endpoint Returns 'Stream Consumed' Error on JSON-RPC POST" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for -32603 Internal error: Stream consumed?

For "LiteLLM A2A Endpoint Returns 'Stream Consumed' Error on JSON-RPC POST", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging -32603 Internal error: Stream consumed?

For "LiteLLM A2A Endpoint Returns 'Stream Consumed' Error on JSON-RPC POST", collect the failing LiteLLM command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.