Implements the AWS Bedrock Converse streaming protocol as the 5th
first-class adapter in @opencode-ai/llm. Single `bedrock-converse`
adapter covers all underlying models (Anthropic, Llama, Mistral,
Cohere, Nova, Titan) since Converse is uniform.
Wire format: messages with text / reasoning / toolUse / toolResult
content blocks, system blocks, inferenceConfig, toolConfig with
toolSpec + toolChoice. Image / document / cache-point content types
are still TODO.
Streaming: AWS event stream binary framing via @smithy/eventstream-codec.
Each frame is decoded then dispatched by `:event-type` header into
the chunk schema. Bedrock splits the finish across `messageStop`
(reason) and `metadata` (usage) — the parser stashes the reason and
emits a single consolidated `request-finish` event when metadata
arrives, with an `onHalt` fallback for truncated streams.
Auth: two paths. Bearer API key (newer) when the consumer sets
`model.headers.authorization = 'Bearer <key>'`. SigV4 signing via
aws4fetch otherwise — credentials live on `model.native.aws_credentials`
and are signed at `toHttp` time so STS-vended tokens are picked up
when the consumer rebuilds the model. The adapter rejects requests
with neither auth path with a clear InvalidRequestError.
Routing: `@ai-sdk/amazon-bedrock` lowers to `bedrock-converse` via
the new `AmazonBedrock` provider routing module; the OpenCode
`llm-bridge.ts` registers it.
Cassette format: response bodies under
`application/vnd.amazon.eventstream` and `application/octet-stream`
content types are now stored as base64 with `bodyEncoding: 'base64'`
on the response snapshot — text round-tripping mangled the CRC32
fields in event-stream frames. Existing cassettes (SSE/JSON) omit
the field and decode as text unchanged.
Tests: 11 deterministic fixtures (prepare / lower messages / lower
tool config / decode text+usage / decode tool calls / decode
reasoning / decode throttling exception / auth path validation /
SigV4 plumbing) + 2 recorded cassettes against live Bedrock
(`us.amazon.nova-micro-v1:0` in us-east-1) for streaming text and
streaming tool calls.
AGENTS.md: documents the Bedrock auth model, binary cassette format,
and updates the protocol coverage / cassette backlog.
Deps: @smithy/eventstream-codec, @smithy/util-utf8, aws4fetch (~40KB
combined; matches AI SDK's approach).
The bash tool description now explicitly states that the temp directory has already been created and exists, preventing agents from unnecessarily trying to create it before use.
- Removed @effect/language-service from both packages/core and packages/opencode tsconfig files and dependencies
- Wrapped mergeDeep calls in config loading and LLM streaming to avoid expensive remeda conditional merge type instantiations in hot paths
- Narrowed Drizzle migrate() overload signature to avoid expensive variance checks during database initialization
These changes reduce TypeScript type-checking overhead and improve startup and runtime performance for config loading, LLM streaming, and database migrations.
Kit Langton