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Published
3 weeks ago
•
anthropics
anthropics
[BUG] Randomly Hitting “Malformed input request” (HTTP 400) Error on AWS Bedrock with Claude CLI ≥ 0.2.107
Environment
- Platform (select one):
- [ ] Anthropic API
- [X] AWS Bedrock
- [ ] Google Vertex AI
- [ ] Other
- Claude CLI version:
0.2.115 - Operating System:
macOS 15.3.2 (24D81) - Terminal:
Warp
Bug Description
Every Claude CLI release after 0.2.106 randomly fails on AWS Bedrock with API Error: 400 Malformed input request, please reformat your input and try again..
Only downgrading to 0.2.106 or below restores the functionality.
Steps to Reproduce
-
npm i -g @anthropic-ai/[email protected](or any version ≥0.2.107). - Ensure Bedrock is being used, e.g.
export CLAUDE_CODE_USE_BEDROCK=1. - Start an interactive shell:
claude. - Send a request (or a couple) to claude.
- Sometimes, the
400error appears on the very first request. Other times, it may be after 2-3 requests 🤷♂. - Downgrade:
npm i -g @anthropic-ai/[email protected]→ issue disappears.
Expected Behavior
The CLI should work as expected with AWS Bedrock.
Actual Behavior
Requests fail with the above error.
Hi @indrasvat - I'm not able to reproduce this on my end. If you run with DEBUG=true, you can see the requests going out. Can you confirm that the payloads look as you expect, and share the failing request paths?
Looks like versions after 0.2.106 are sometimes injecting a thinking: undefined in the POST request payload, which is perhaps making Bedrock grumpy 🤷🏼?
claude==0.2.115 (fails)
$ echo "CLAUDE_CODE_USE_BEDROCK=$CLAUDE_CODE_USE_BEDROCK" && claude --version && DEBUG=true claude --verbose
CLAUDE_CODE_USE_BEDROCK=1
0.2.115 (Claude Code)
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code research preview! │
│ │
│ /help for help, /status for your current setup │
│ │
│ cwd: /private/tmp/banr │
╰───────────────────────────────────────────────────╯
Tips for getting started:
1. Run /init to create a CLAUDE.md file with instructions for Claude
2. Use Claude to help with file analysis, editing, bash commands and git
3. Be as specific as you would with another engineer for the best results
> What is this script about?
Anthropic:DEBUG:request https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke-with-response-stream {
method: 'post',
path: '/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke-with-response-stream',
body: {
model: undefined,
messages: [ [Object], [Object] ],
temperature: 1,
system: [ [Object], [Object] ],
tools: [
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object],
... 41 more items
],
tool_choice: undefined,
metadata: {
user_id: 'b6c2672bdf43cc44267a659218d3d3d765f02ca35b68834a32ca9bc151269059'
},
max_tokens: 20000,
thinking: undefined,
stream: undefined,
anthropic_version: 'bedrock-2023-05-31',
anthropic_beta: [ 'claude-code-20250219' ]
},
timeout: 60000,
signal: AbortSignal { aborted: false },
headers: {
'anthropic-beta': 'claude-code-20250219',
'X-Stainless-Helper-Method': 'stream'
},
stream: true,
__streamClass: [class nZ1 extends rW]
} {
'content-length': '282440',
accept: 'application/json',
'content-type': 'application/json',
'user-agent': 'claude-cli/0.2.115 (external)',
'x-stainless-lang': 'js',
'x-stainless-package-version': '0.41.0',
'x-stainless-os': 'MacOS',
'x-stainless-arch': 'arm64',
'x-stainless-runtime': 'node',
'x-stainless-runtime-version': 'v22.13.1',
'x-app': 'cli',
'anthropic-beta': 'claude-code-20250219',
'x-stainless-helper-method': 'stream',
'x-stainless-retry-count': '0',
'x-stainless-timeout': '60',
host: 'bedrock-runtime.us-east-1.amazonaws.com',
'x-amz-date': '20250518T011744Z',
'x-amz-security-token': '"FwoGZXIvYXdzEMP//////////wEaDGHywJQ8LtNmMVmk5CKLAgUECOczqJzU1w7Ci176mpbEbL5VnOookSt5jgS4lXlVSjd40zoeCssnd6eMCFI5TD4N0HEkCxNRrpR1Fwe7lKC6nJyr2dIHBR3j/7xELmxGZvjnad7EXPzMltAVDuQZwlgvE6eQMhs147hlqQtN0HSijTYNQpeGIJF8r6ffPMZfp3RK5+JDrn7zxb5PqAl5lgb2dnxMjqWHwj/66gGYrODFVmgZQg1rjMKmMKVr/d/gSb6WL8W3+52S8zrlwi17H9QkfjpR0bTfvKGOAJP+TFFVDCC7vG2FjQp+218dCLRfK7ln0mRAxf3ITmSb0FejfJ+h/JvYsn2S+UHpNCDMKwS4l+9sT4LfEtadpii86aTBBjIrNpi97iPXTj2smAZOaq5ZvG6Af6d50GeamYU7nAolrMBn88ic+IjYbPWjjA=="',
'x-amz-content-sha256': '24bacd0801238d5d85acb5d38d9792d630825a985ffc27e54cf8cae5d40e00b0',
authorization: 'AWS4-HMAC-SHA256 Credential=ASIAV2NUTZXECIZB2PPT/20250518/us-east-1/bedrock/aws4_request, SignedHeaders=accept;anthropic-beta;content-length;content-type;host;x-amz-content-sha256;x-amz-date;x-amz-security-token;x-app;x-stainless-arch;x-stainless-helper-method;x-stainless-lang;x-stainless-os;x-stainless-package-version;x-stainless-retry-count;x-stainless-runtime;x-stainless-runtime-version;x-stainless-timeout, Signature=d233d7f5506fd2a7bf2968ace1e86cf1c266399a0881de11f4bf7dfe066fc4ba'
}
Anthropic:DEBUG:response (error; (error; not retryable)) 400 https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke-with-response-stream {
connection: 'keep-alive',
'content-length': '80',
'content-type': 'application/json',
date: 'Sun, 18 May 2025 01:17:45 GMT',
'x-amzn-errortype': 'ValidationException:http://internal.amazon.com/coral/com.amazon.bedrock/',
'x-amzn-requestid': '9599041c-9912-4382-8951-ad2d27e5625a'
} undefined
Anthropic:DEBUG:request https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke {
method: 'post',
path: '/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke',
body: {
model: undefined,
messages: [ [Object], [Object] ],
temperature: 1,
system: [ [Object], [Object] ],
tools: [
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object],
... 41 more items
],
tool_choice: undefined,
metadata: {
user_id: 'b6c2672bdf43cc44267a659218d3d3d765f02ca35b68834a32ca9bc151269059'
},
max_tokens: 20000,
thinking: undefined,
anthropic_version: 'bedrock-2023-05-31',
anthropic_beta: [ 'claude-code-20250219' ],
stream: undefined
},
timeout: 60000,
headers: { 'anthropic-beta': 'claude-code-20250219' },
stream: false,
__streamClass: [class nZ1 extends rW]
} {
'content-length': '282440',
accept: 'application/json',
'content-type': 'application/json',
'user-agent': 'claude-cli/0.2.115 (external)',
'x-stainless-lang': 'js',
'x-stainless-package-version': '0.41.0',
'x-stainless-os': 'MacOS',
'x-stainless-arch': 'arm64',
'x-stainless-runtime': 'node',
'x-stainless-runtime-version': 'v22.13.1',
'x-app': 'cli',
'anthropic-beta': 'claude-code-20250219',
'x-stainless-retry-count': '0',
'x-stainless-timeout': '60',
host: 'bedrock-runtime.us-east-1.amazonaws.com',
'x-amz-date': '20250518T011745Z',
'x-amz-security-token': '"FwoGZXIvYXdzEMP//////////wEaDGHywJQ8LtNmMVmk5CKLAgUECOczqJzU1w7Ci176mpbEbL5VnOookSt5jgS4lXlVSjd40zoeCssnd6eMCFI5TD4N0HEkCxNRrpR1Fwe7lKC6nJyr2dIHBR3j/7xELmxGZvjnad7EXPzMltAVDuQZwlgvE6eQMhs147hlqQtN0HSijTYNQpeGIJF8r6ffPMZfp3RK5+JDrn7zxb5PqAl5lgb2dnxMjqWHwj/66gGYrODFVmgZQg1rjMKmMKVr/d/gSb6WL8W3+52S8zrlwi17H9QkfjpR0bTfvKGOAJP+TFFVDCC7vG2FjQp+218dCLRfK7ln0mRAxf3ITmSb0FejfJ+h/JvYsn2S+UHpNCDMKwS4l+9sT4LfEtadpii86aTBBjIrNpi97iPXTj2smAZOaq5ZvG6Af6d50GeamYU7nAolrMBn88ic+IjYbPWjjA=="',
'x-amz-content-sha256': '24bacd0801238d5d85acb5d38d9792d630825a985ffc27e54cf8cae5d40e00b0',
authorization: 'AWS4-HMAC-SHA256 Credential=ASIAV2NUTZXECIZB2PPT/20250518/us-east-1/bedrock/aws4_request, SignedHeaders=accept;anthropic-beta;content-length;content-type;host;x-amz-content-sha256;x-amz-date;x-amz-security-token;x-app;x-stainless-arch;x-stainless-lang;x-stainless-os;x-stainless-package-version;x-stainless-retry-count;x-stainless-runtime;x-stainless-runtime-version;x-stainless-timeout, Signature=35992a333ef135e36f20140864c6da21e07eef48a68b6c7249ed21489c682031'
}
Anthropic:DEBUG:response (error; (error; not retryable)) 400 https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke {
connection: 'keep-alive',
'content-length': '80',
'content-type': 'application/json',
date: 'Sun, 18 May 2025 01:17:46 GMT',
'x-amzn-errortype': 'ValidationException:http://internal.amazon.com/coral/com.amazon.bedrock/',
'x-amzn-requestid': '8294a03d-2259-4b52-a396-2f954f31509f'
} undefined
⎿ API Error: 400 Malformed input request, please reformat your input and try again.
claude==0.2.106 (works)
$ echo "CLAUDE_CODE_USE_BEDROCK=$CLAUDE_CODE_USE_BEDROCK" && claude --version && DEBUG=true claude --verbose
CLAUDE_CODE_USE_BEDROCK=1
0.2.106 (Claude Code)
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code research preview! │
│ │
│ /help for help, /status for your current setup │
│ │
│ cwd: /private/tmp/banr │
╰───────────────────────────────────────────────────╯
> What is this script about?
Anthropic:DEBUG:request https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-5-haiku-20241022-v1:0/invoke-with-response-stream {
method: 'post',
path: '/model/us.anthropic.claude-3-5-haiku-20241022-v1:0/invoke-with-response-stream',
body: {
model: undefined,
max_tokens: 512,
messages: [ [Object] ],
system: [ [Object] ],
temperature: 0,
metadata: {
user_id: 'b6c2672bdf43cc44267a659218d3d3d765f02ca35b68834a32ca9bc151269059'
},
stream: undefined,
anthropic_version: 'bedrock-2023-05-31'
},
timeout: 60000,
signal: AbortSignal { aborted: false },
headers: { 'X-Stainless-Helper-Method': 'stream' },
stream: true,
__streamClass: [class hY1 extends yX]
} {
'content-length': '1057',
accept: 'application/json',
'content-type': 'application/json',
'user-agent': 'claude-cli/0.2.106 (external)',
'x-stainless-lang': 'js',
'x-stainless-package-version': '0.41.0',
'x-stainless-os': 'MacOS',
'x-stainless-arch': 'arm64',
'x-stainless-runtime': 'node',
'x-stainless-runtime-version': 'v22.13.1',
'x-app': 'cli',
'x-stainless-helper-method': 'stream',
'x-stainless-retry-count': '0',
'x-stainless-timeout': '60',
host: 'bedrock-runtime.us-east-1.amazonaws.com',
'x-amz-date': '20250518T012108Z',
'x-amz-security-token': '"FwoGZXIvYXdzEMP//////////wEaDGHywJQ8LtNmMVmk5CKLAgUECOczqJzU1w7Ci176mpbEbL5VnOookSt5jgS4lXlVSjd40zoeCssnd6eMCFI5TD4N0HEkCxNRrpR1Fwe7lKC6nJyr2dIHBR3j/7xELmxGZvjnad7EXPzMltAVDuQZwlgvE6eQMhs147hlqQtN0HSijTYNQpeGIJF8r6ffPMZfp3RK5+JDrn7zxb5PqAl5lgb2dnxMjqWHwj/66gGYrODFVmgZQg1rjMKmMKVr/d/gSb6WL8W3+52S8zrlwi17H9QkfjpR0bTfvKGOAJP+TFFVDCC7vG2FjQp+218dCLRfK7ln0mRAxf3ITmSb0FejfJ+h/JvYsn2S+UHpNCDMKwS4l+9sT4LfEtadpii86aTBBjIrNpi97iPXTj2smAZOaq5ZvG6Af6d50GeamYU7nAolrMBn88ic+IjYbPWjjA=="',
'x-amz-content-sha256': '46f71e8ea2dc60084fc2f325544a183e7bbec5621983f67f687bfa8d311c35f2',
authorization: 'AWS4-HMAC-SHA256 Credential=ASIAV2NUTZXECIZB2PPT/20250518/us-east-1/bedrock/aws4_request, SignedHeaders=accept;content-length;content-type;host;x-amz-content-sha256;x-amz-date;x-amz-security-token;x-app;x-stainless-arch;x-stainless-helper-method;x-stainless-lang;x-stainless-os;x-stainless-package-version;x-stainless-retry-count;x-stainless-runtime;x-stainless-runtime-version;x-stainless-timeout, Signature=76351c4fb612b2f868b1daedecf8f8840c1a105edaf28d2e26d68302bd40c179'
}
Anthropic:DEBUG:request https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke-with-response-stream {
method: 'post',
path: '/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke-with-response-stream',
body: {
model: undefined,
max_tokens: 20000,
messages: [ [Object] ],
temperature: 1,
system: [ [Object], [Object] ],
tools: [
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object], [Object], [Object],
[Object], [Object], [Object], [Object],
... 41 more items
],
tool_choice: undefined,
metadata: {
user_id: 'b6c2672bdf43cc44267a659218d3d3d765f02ca35b68834a32ca9bc151269059'
},
stream: undefined,
anthropic_version: 'bedrock-2023-05-31',
anthropic_beta: [ 'claude-code-20250219' ]
},
timeout: 60000,
signal: AbortSignal { aborted: false },
headers: {
'anthropic-beta': 'claude-code-20250219',
'X-Stainless-Helper-Method': 'stream'
},
stream: true,
__streamClass: [class hY1 extends yX]
} {
'content-length': '279596',
accept: 'application/json',
'content-type': 'application/json',
'user-agent': 'claude-cli/0.2.106 (external)',
'x-stainless-lang': 'js',
'x-stainless-package-version': '0.41.0',
'x-stainless-os': 'MacOS',
'x-stainless-arch': 'arm64',
'x-stainless-runtime': 'node',
'x-stainless-runtime-version': 'v22.13.1',
'x-app': 'cli',
'anthropic-beta': 'claude-code-20250219',
'x-stainless-helper-method': 'stream',
'x-stainless-retry-count': '0',
'x-stainless-timeout': '60',
host: 'bedrock-runtime.us-east-1.amazonaws.com',
'x-amz-date': '20250518T012108Z',
'x-amz-security-token': '"FwoGZXIvYXdzEMP//////////wEaDGHywJQ8LtNmMVmk5CKLAgUECOczqJzU1w7Ci176mpbEbL5VnOookSt5jgS4lXlVSjd40zoeCssnd6eMCFI5TD4N0HEkCxNRrpR1Fwe7lKC6nJyr2dIHBR3j/7xELmxGZvjnad7EXPzMltAVDuQZwlgvE6eQMhs147hlqQtN0HSijTYNQpeGIJF8r6ffPMZfp3RK5+JDrn7zxb5PqAl5lgb2dnxMjqWHwj/66gGYrODFVmgZQg1rjMKmMKVr/d/gSb6WL8W3+52S8zrlwi17H9QkfjpR0bTfvKGOAJP+TFFVDCC7vG2FjQp+218dCLRfK7ln0mRAxf3ITmSb0FejfJ+h/JvYsn2S+UHpNCDMKwS4l+9sT4LfEtadpii86aTBBjIrNpi97iPXTj2smAZOaq5ZvG6Af6d50GeamYU7nAolrMBn88ic+IjYbPWjjA=="',
'x-amz-content-sha256': '7ceeba63796d42a5c89a29d63c33d6b232015dd18343c8115d1571560d2aa8ac',
authorization: 'AWS4-HMAC-SHA256 Credential=ASIAV2NUTZXECIZB2PPT/20250518/us-east-1/bedrock/aws4_request, SignedHeaders=accept;anthropic-beta;content-length;content-type;host;x-amz-content-sha256;x-amz-date;x-amz-security-token;x-app;x-stainless-arch;x-stainless-helper-method;x-stainless-lang;x-stainless-os;x-stainless-package-version;x-stainless-retry-count;x-stainless-runtime;x-stainless-runtime-version;x-stainless-timeout, Signature=01fb220a8dd973094fec938b0c350f26d2e1e2343010c54137c38a99e1cf240b'
}
Anthropic:DEBUG:response 200 https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-5-haiku-20241022-v1:0/invoke-with-response-stream iF [Headers] {
[Symbol(map)]: [Object: null prototype] {
date: [ 'Sun, 18 May 2025 01:21:08 GMT' ],
'content-type': [ 'application/vnd.amazon.eventstream' ],
'transfer-encoding': [ 'chunked' ],
connection: [ 'keep-alive' ],
'x-amzn-requestid': [ 'a167aae3-6e13-4313-949b-5a66bd3fc13d' ],
'x-amzn-bedrock-content-type': [ 'application/json' ]
}
} PassThrough {
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close: [Function: bound onceWrapper] { listener: [Function: onclose] },
error: [ [Function: onerror], [Function (anonymous)] ],
prefinish: [Function: prefinish],
finish: [Function: bound onceWrapper] { listener: [Function: onfinish] },
drain: undefined,
data: undefined,
end: undefined,
readable: undefined,
unpipe: [Function: onunpipe]
},
_readableState: ReadableState {
highWaterMark: 65536,
buffer: [],
bufferIndex: 0,
length: 0,
pipes: [],
awaitDrainWriters: null,
[Symbol(kState)]: 1048844
},
_writableState: WritableState {
highWaterMark: 65536,
length: 0,
corked: 0,
onwrite: [Function: bound onwrite],
writelen: 0,
bufferedIndex: 0,
pendingcb: 0,
[Symbol(kState)]: 17580812,
[Symbol(kBufferedValue)]: null
},
allowHalfOpen: true,
_maxListeners: undefined,
_eventsCount: 5,
[Symbol(shapeMode)]: true,
[Symbol(kCapture)]: false,
[Symbol(kCallback)]: null
}
Anthropic:DEBUG:response 200 https://bedrock-runtime.us-east-1.amazonaws.com/model/us.anthropic.claude-3-7-sonnet-20250219-v1:0/invoke-with-response-stream iF [Headers] {
[Symbol(map)]: [Object: null prototype] {
date: [ 'Sun, 18 May 2025 01:21:17 GMT' ],
'content-type': [ 'application/vnd.amazon.eventstream' ],
'transfer-encoding': [ 'chunked' ],
connection: [ 'keep-alive' ],
'x-amzn-requestid': [ 'c82358a4-0986-4906-a823-3a26b72c53b6' ],
'x-amzn-bedrock-content-type': [ 'application/json' ]
}
} PassThrough {
_events: {
close: [Function: bound onceWrapper] { listener: [Function: onclose] },
error: [ [Function: onerror], [Function (anonymous)] ],
prefinish: [Function: prefinish],
finish: [Function: bound onceWrapper] { listener: [Function: onfinish] },
drain: undefined,
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⏺ Let me examine the script to tell you what it's about.
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⏺ This script is a command-line tool called "banr" that converts text into stylized ASCII art banners in the terminal...
Actually, the thinking: undefined is prolly not the issue. I edited lib/node_modules/@anthropic-ai/claude-code/cli.js in my local install and removed that block (also added a log message to ensure it was picking my changes). The below interaction is interesting since the first request succeeds but then the following one fails with the 400 error. No thinking block in any request.
Not sure if this helps clarify things more.
$ echo "CLAUDE_CODE_USE_BEDROCK=$CLAUDE_CODE_USE_BEDROCK" && claude --version && DEBUG=true claude
CLAUDE_CODE_USE_BEDROCK=1
CLAUDE CODE / GRUMPY BEDROCK!!!
0.2.117 (Claude Code)
CLAUDE CODE / GRUMPY BEDROCK!!!
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│ /help for help, /status for your current setup │
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╰───────────────────────────────────────────────────╯
※ Tip: Use /memory to view and manage Claude memory
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> If `--animate` is used, then `--color <color>` is ignored, it seems.
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⏺ I'll check how --animate and --color options are handled in the code.
⏺ Read(banr.py)…
⎿ Read 146 lines (ctrl+r to expand)
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⏺ You're correct. The --color parameter is passed to animate_banner() on line 140 but isn't actually used within that function. The animate_banner() function
(lines 95-114) accepts a color parameter but never applies it to the output.
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> Fix it.
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⎿ API Error: 400 Malformed input request, please reformat your input and try again.
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ > │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
? for shortcuts
Total cost: $0.2392
Total duration (API): 31.2s
Total duration (wall): 38.7s
Total code changes: 0 lines added, 0 lines removed
Token usage by model:
claude-3-5-haiku: 1.3k input, 69 output, 0 cache read, 0 cache write
claude-3-7-sonnet: 10 input, 151 output, 56.1k cache read, 58.3k cache write
Ok, it seems the tools array length is causing the issue. A length > 128 seems to cause it to fail with that 400 error. Tested with 0.2.120.
tools.length==130
$ echo "CLAUDE_CODE_USE_BEDROCK=$CLAUDE_CODE_USE_BEDROCK" && claude --version && DEBUG=false claude
CLAUDE_CODE_USE_BEDROCK=1
0.2.120 (Claude Code)
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code research preview! │
│ │
│ /help for help, /status for your current setup │
│ │
│ cwd: /private/tmp/banr │
╰───────────────────────────────────────────────────╯
> Document the recent logging changes in brief as well.
⏺ Let me check the logging changes. I'll look through the files to understand what's been changed.
⏺ Call(Find logging changes)…
⎿ Error: File content (634KB) exceeds maximum allowed size (256KB). Please use offset and limit parameters to read specific portions of the file, or use the
GrepTool to search for specific content.
⏺ I need to read the files in smaller chunks. Let me try a different approach:
⏺ Read(README.md)…
⎿ Read 177 lines (ctrl+r to expand)
⏺ Read(banr.py)…
⎿ Read 1569 lines (ctrl+r to expand)
⏺ Read(claude-code-aws-bedrock-failing-request-log.txt)…
⎿ Read 100 lines (ctrl+r to expand)
⎿ Interrupted by user
> Ignore the .txt file
⚠️ 2025-05-19T18:24:58.813Z tool list truncated to 132/141 entries for AWS Bedrock
⚠️ 2025-05-19T18:25:00.063Z tool list truncated to 132/141 entries for AWS Bedrock
⎿ API Error: 400 Malformed input request, please reformat your input and try again.
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ > │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
? for shortcuts ✓ Update installed · Restart to apply
Total cost: $0.2384
Total duration (API): 37.3s
Total duration (wall): 43.9s
Total code changes: 0 lines added, 0 lines removed
Token usage by model:
claude-3-5-haiku: 1.0k input, 57 output, 0 cache read, 0 cache write
claude-3-7-sonnet: 23 input, 483 output, 81.4k cache read, 54.8k cache write
tools.length==128
$ echo "CLAUDE_CODE_USE_BEDROCK=$CLAUDE_CODE_USE_BEDROCK" && claude --version && DEBUG=false claude
CLAUDE_CODE_USE_BEDROCK=1
0.2.120 (Claude Code)
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code research preview! │
│ │
│ /help for help, /status for your current setup │
│ │
│ cwd: /private/tmp/banr │
╰───────────────────────────────────────────────────╯
※ Tip: Hit Enter to queue up additional messages while Claude is working.
> Wear your architect hat and come up with non-trivial, optimal refactoring suggestions for banr.py. Ignore any .txt files.
⚠️ 2025-05-19T18:26:23.669Z tool list truncated to 128/141 entries for AWS Bedrock
⏺ I'll analyze banr.py to identify refactoring opportunities. Let me first read the file.
⏺ Read(banr.py)…
⎿ Read 1569 lines (ctrl+r to expand)
⚠️ 2025-05-19T18:26:33.927Z tool list truncated to 128/141 entries for AWS Bedrock
⏺ Let me also check the README to understand the project's purpose and context.
⏺ Read(README.md)…
⎿ Read 177 lines (ctrl+r to expand)
⚠️ 2025-05-19T18:26:41.251Z tool list truncated to 128/141 entries for AWS Bedrock
⏺ Now that I've reviewed the code and documentation, I'll provide refactoring suggestions for banr.py. As an architect, I'll focus on structural improvements, code
organization, performance optimizations, and maintainability enhancements.
Here are my refactoring suggestions:
...
These refactoring suggestions would lead to:
1. Better separation of concerns
2. Improved testability
3. More maintainable code
4. Easier extensibility for adding new features
5. Better performance through optimized algorithms
6. Improved error handling
7. More consistent use of modern Python features
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ > │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
? for shortcuts ✓ Update installed · Restart to apply
The below jscodeshift script applies this fix to the local cli.js and things start working again.
/**
* add-bedrock-tools-check-to-minified-claude-code-cli.js
*
* • finds every makeRequest(…) implementation (method or fn)
* • inserts a ≤128‑tools guard *immediately after*
* await this.prepareOptions(D);
* • if // bedrock‑tools‑cap is already present → skips
* • verbose, timestamp‑stamped logs
*/
module.exports = function (file, api) {
const j = api.jscodeshift;
const now = () => new Date().toISOString();
const log = (...msg) => console.log('[cap]', now(), ...msg);
const TAG = 'bedrock-tools-cap';
const root = j(file.source);
let changed = 0;
/* ---------- helper to manufacture the guard AST ---------- */
const makeGuard = () => {
// ── 1. if (D.body && Array.isArray(D.body.tools) && D.body.tools.length > 128) ──
const test = j.logicalExpression(
'&&',
j.logicalExpression(
'&&',
j.memberExpression(j.identifier('D'), j.identifier('body')),
j.callExpression(
j.memberExpression(j.identifier('Array'), j.identifier('isArray')),
[
j.memberExpression(
j.memberExpression(j.identifier('D'), j.identifier('body')),
j.identifier('tools')
),
]
)
),
j.binaryExpression(
'>',
j.memberExpression(j.memberExpression(
j.memberExpression(j.identifier('D'), j.identifier('body')),
j.identifier('tools')
), j.identifier('length')),
j.literal(128)
)
);
// ── 2. console.warn … ─────────────────────────────────────────────
const warn = j.expressionStatement(
j.callExpression(
j.memberExpression(j.identifier('console'), j.identifier('warn')),
[
j.literal('⚠️'),
j.callExpression(
j.memberExpression(
j.newExpression(j.identifier('Date'), []),
j.identifier('toISOString')
),
[]
),
j.templateLiteral(
[
j.templateElement(
{ cooked: 'tool list truncated to 128/', raw: 'tool list truncated to 128/' },
false
),
j.templateElement(
{ cooked: ' entries for AWS Bedrock', raw: ' entries for AWS Bedrock' },
true
),
],
[
j.memberExpression(
j.memberExpression(
j.memberExpression(j.identifier('D'), j.identifier('body')),
j.identifier('tools')
),
j.identifier('length')
),
]
),
]
)
);
// ── 3. D.body.tools = D.body.tools.slice(0, 128); ─────────────────
const trim = j.expressionStatement(
j.assignmentExpression(
'=',
j.memberExpression(
j.memberExpression(j.identifier('D'), j.identifier('body')),
j.identifier('tools')
),
j.callExpression(
j.memberExpression(
j.memberExpression(
j.memberExpression(j.identifier('D'), j.identifier('body')),
j.identifier('tools')
),
j.identifier('slice')
),
[j.literal(0), j.literal(128)]
)
)
);
const guard = j.ifStatement(test, j.blockStatement([warn, trim]));
guard.comments = [{ type: 'Line', value: ' ' + TAG }];
return guard;
};
/* ---------- end helper ---------- */
/* collect both class‑method and plain‑function variants */
const makeReqFns = []
.concat(root.find(j.MethodDefinition, { key: { name: 'makeRequest' } }).paths())
.concat(root.find(j.FunctionDeclaration, { id: { name: 'makeRequest' } }).paths());
log('makeRequest() candidates:', makeReqFns.length);
makeReqFns.forEach(fnPath => {
/* skip if sentinel comment already present */
if (j(fnPath).find(j.Comment, { value: v => v.includes(TAG) }).size()) {
log('↪ already patched – skipping');
return;
}
const body = fnPath.get('value', 'body', 'body').value;
/* locate the await this.prepareOptions(D); statement */
const idx = body.findIndex(s =>
s.type === 'ExpressionStatement' &&
s.expression.type === 'AwaitExpression' &&
s.expression.argument.type === 'CallExpression' &&
s.expression.argument.callee.property?.name === 'prepareOptions'
);
if (idx === -1) {
log('✗ prepareOptions() not found – skipping');
return;
}
body.splice(idx + 1, 0, makeGuard());
changed++;
log('✓ guard inserted after stmt', idx);
});
if (!changed) {
log('nothing changed – leaving file untouched');
return null; // tells jscodeshift “no output”
}
log('✅ finished –', changed, 'function(s) patched');
return root.toSource({ quote: 'single' });
};
Running the script:
$ npx jscodeshift -t add-bedrock-tools-check-to-minified-claude-code-cli.js ~/.volta/tools/image/packages/@anthropic-ai/claude-code/lib/node_modules/@anthropic-ai/claude-code/cli.js
Processing 1 files...
Spawning 1 workers...
Sending 1 files to free worker...
[cap] 2025-05-19T17:19:01.527Z makeRequest() candidates: 1
[cap] 2025-05-19T17:19:01.530Z ✓ guard inserted after stmt 2
[cap] 2025-05-19T17:19:01.530Z ✅ finished – 1 function(s) patched
All done.
Results:
0 errors
0 unmodified
0 skipped
1 ok
Time elapsed: 185.418seconds
The updated cli.js section:
$ bat ~/.volta/tools/image/packages/@anthropic-ai/claude-code/lib/node_modules/@anthropic-ai/claude-code/cli.js | rg -A 12 'async makeRequest'
`),raw:this.chunks};return this.event=null,this.data=[],this.chunks=[],W}if(this.chunks.push(Z),Z.startsWith(":"))return null;let[G,D,B]=aS4(Z,":");if(B.startsWith(" "))B=B.substring(1);if(G==="event")this.event=B;else if(G==="data")this.data.push(B);return null}}function aS4(Z,G){let D=Z.indexOf(G);if(D!==-1)return[Z.substring(0,D),G,Z.substring(D+G.length)];return[Z,"",""]}var sS4=(Z)=>Z!=null&&typeof Z==="object"&&typeof Z.url==="string"&&typeof Z.blob==="function",rS4=(Z)=>Z!=null&&typeof Z==="object"&&typeof Z.name==="string"&&typeof Z.lastModified==="number"&&Np(Z),Np=(Z)=>Z!=null&&typeof Z==="object"&&typeof Z.size==="number"&&typeof Z.type==="string"&&typeof Z.text==="function"&&typeof Z.slice==="function"&&typeof Z.arrayBuffer==="function";async function Lk0(Z,G,D){if(Z=await Z,rS4(Z))return Z;if(sS4(Z)){let W=await Z.blob();G||(G=new URL(Z.url).pathname.split(/[\\/]/).pop()??"unknown_file");let Y=Np(W)?[await W.arrayBuffer()]:[W];return new y21(Y,G,D)}let B=await oS4(Z);if(G||(G=eS4(Z)??"unknown_file"),!D?.type){let W=B[0]?.type;if(typeof W==="string")D={...D,type:W}}return new y21(B,G,D)}async function oS4(Z){let G=[];if(typeof Z==="string"||ArrayBuffer.isView(Z)||Z instanceof ArrayBuffer)G.push(Z);else if(Np(Z))G.push(await Z.arrayBuffer());else if(Z_4(Z))for await(let D of Z)G.push(D);else throw new Error(`Unexpected data type: ${typeof Z}; constructor: ${Z?.constructor?.name}; props: ${tS4(Z)}`);return G}function tS4(Z){return`[${Object.getOwnPropertyNames(Z).map((D)=>`"${D}"`).join(", ")}]`}function eS4(Z){return $M1(Z.name)||$M1(Z.filename)||$M1(Z.path)?.split(/[\\/]/).pop()}var $M1=(Z)=>{if(typeof Z==="string")return Z;if(typeof Buffer!=="undefined"&&Z instanceof Buffer)return String(Z);return},Z_4=(Z)=>Z!=null&&typeof Z==="object"&&typeof Z[Symbol.asyncIterator]==="function",UM1=(Z)=>Z&&typeof Z==="object"&&Z.body&&Z[Symbol.toStringTag]==="MultipartBody";var D_4=function(Z,G,D,B,W){if(B==="m")throw new TypeError("Private method is not writable");if(B==="a"&&!W)throw new TypeError("Private accessor was defined without a setter");if(typeof G==="function"?Z!==G||!W:!G.has(Z))throw new TypeError("Cannot write private member to an object whose class did not declare it");return B==="a"?W.call(Z,D):W?W.value=D:G.set(Z,D),D},B_4=function(Z,G,D,B){if(D==="a"&&!B)throw new TypeError("Private accessor was defined without a getter");if(typeof G==="function"?Z!==G||!B:!G.has(Z))throw new TypeError("Cannot read private member from an object whose class did not declare it");return D==="m"?B:D==="a"?B.call(Z):B?B.value:G.get(Z)},T91;CM1();async function Pk0(Z){let{response:G}=Z;if(Z.options.stream){if(Sk("response",G.status,G.url,G.headers,G.body),Z.options.__streamClass)return Z.options.__streamClass.fromSSEResponse(G,Z.controller);return GY.fromSSEResponse(G,Z.controller)}if(G.status===204)return null;if(Z.options.__binaryResponse)return G;let B=G.headers.get("content-type")?.split(";")[0]?.trim();if(B?.includes("application/json")||B?.endsWith("+json")){let X=await G.json();return Sk("response",G.status,G.url,G.headers,X),Tk0(X,G)}let Y=await G.text();return Sk("response",G.status,G.url,G.headers,Y),Y}function Tk0(Z,G){if(!Z||typeof Z!=="object"||Array.isArray(Z))return Z;return Object.defineProperty(Z,"_request_id",{value:G.headers.get("request-id"),enumerable:!1})}class S91 extends Promise{constructor(Z,G=Pk0){super((D)=>{D(null)});this.responsePromise=Z,this.parseResponse=G}_thenUnwrap(Z){return new S91(this.responsePromise,async(G)=>Tk0(Z(await this.parseResponse(G),G),G.response))}asResponse(){return this.responsePromise.then((Z)=>Z.response)}async withResponse(){let[Z,G]=await Promise.all([this.parse(),this.asResponse()]);return{data:Z,response:G,request_id:G.headers.get("request-id")}}parse(){if(!this.parsedPromise)this.parsedPromise=this.responsePromise.then(this.parseResponse);return this.parsedPromise}then(Z,G){return this.parse().then(Z,G)}catch(Z){return this.parse().catch(Z)}finally(Z){return this.parse().finally(Z)}}class qE{constructor({baseURL:Z,maxRetries:G=2,timeout:D=600000,httpAgent:B,fetch:W}){this.baseURL=Z,this.maxRetries=NM1("maxRetries",G),this.timeout=NM1("timeout",D),this.httpAgent=B,this.fetch=W??NU1}authHeaders(Z){return{}}defaultHeaders(Z){return{Accept:"application/json","Content-Type":"application/json","User-Agent":this.getUserAgent(),...V_4(),...this.authHeaders(Z)}}validateHeaders(Z,G){}defaultIdempotencyKey(){return`stainless-node-retry-${K_4()}`}get(Z,G){return this.methodRequest("get",Z,G)}post(Z,G){return this.methodRequest("post",Z,G)}patch(Z,G){return this.methodRequest("patch",Z,G)}put(Z,G){return this.methodRequest("put",Z,G)}delete(Z,G){return this.methodRequest("delete",Z,G)}methodRequest(Z,G,D){return this.request(Promise.resolve(D).then(async(B)=>{let W=B&&Np(B?.body)?new DataView(await B.body.arrayBuffer()):B?.body instanceof DataView?B.body:B?.body instanceof ArrayBuffer?new DataView(B.body):B&&ArrayBuffer.isView(B?.body)?new DataView(B.body.buffer):B?.body;return{method:Z,path:G,...B,body:W}}))}getAPIList(Z,G,D){return this.requestAPIList(G,{method:"get",path:Z,...D})}calculateContentLength(Z){if(typeof Z==="string"){if(typeof Buffer!=="undefined")return Buffer.byteLength(Z,"utf8").toString();if(typeof TextEncoder!=="undefined")return new TextEncoder().encode(Z).length.toString()}else if(ArrayBuffer.isView(Z))return Z.byteLength.toString();return null}buildRequest(Z,{retryCount:G=0}={}){let D={...Z},{method:B,path:W,query:Y,headers:X={}}=D,V=ArrayBuffer.isView(D.body)||D.__binaryRequest&&typeof D.body==="string"?D.body:UM1(D.body)?D.body.body:D.body?JSON.stringify(D.body,null,2):null,J=this.calculateContentLength(V),F=this.buildURL(W,Y);if("timeout"in D)NM1("timeout",D.timeout);D.timeout=D.timeout??this.timeout;let Q=D.httpAgent??this.httpAgent??MU1(F),K=D.timeout+1000;if(typeof Q?.options?.timeout==="number"&&K>(Q.options.timeout??0))Q.options.timeout=K;if(this.idempotencyHeader&&B!=="get"){if(!Z.idempotencyKey)Z.idempotencyKey=this.defaultIdempotencyKey();X[this.idempotencyHeader]=Z.idempotencyKey}let I=this.buildHeaders({options:D,headers:X,contentLength:J,retryCount:G});return {req:{method:B,...(V && {body:V}),headers:I,...(Q && {agent:Q}),signal:D.signal??null},url:F,timeout:D.timeout};}buildHeaders({options:Z,headers:G,contentLength:D,retryCount:B}){let W={};if(D)W["content-length"]=D;let Y=this.defaultHeaders(Z);if(Ek0(W,Y),Ek0(W,G),UM1(Z.body)&&fR!=="node")delete W["content-type"];if(Tk(Y,"x-stainless-retry-count")===void 0&&Tk(G,"x-stainless-retry-count")===void 0)W["x-stainless-retry-count"]=String(B);if(Tk(Y,"x-stainless-timeout")===void 0&&Tk(G,"x-stainless-timeout")===void 0&&Z.timeout)W["x-stainless-timeout"]=String(Math.trunc(Z.timeout/1000));return this.validateHeaders(W,G),W}_calculateNonstreamingTimeout(Z){if(3600*Z/128000>600)throw new x4("Streaming is strongly recommended for operations that may take longer than 10 minutes. See https://github.com/anthropics/anthropic-sdk-python#streaming-responses for more details");return 600000}async prepareOptions(Z){}async prepareRequest(Z,{url:G,options:D}){}parseHeaders(Z){return!Z?{}:(Symbol.iterator in Z)?Object.fromEntries(Array.from(Z).map((G)=>[...G])):{...Z}}makeStatusError(Z,G,D,B){return f5.generate(Z,G,D,B)}request(Z,G=null){return new S91(this.makeRequest(Z,G))}async makeRequest(Z,G){
let D=await Z,B=D.maxRetries??this.maxRetries;if(G==null)G=B;await this.prepareOptions(D);
// bedrock-tools-cap
if (D.body && Array.isArray(D.body.tools) && D.body.tools.length > 128) {
console.warn(
'⚠️',
new Date().toISOString(),
`tool list truncated to 128/${D.body.tools.length} entries for AWS Bedrock`
);
D.body.tools = D.body.tools.slice(0, 128);
}
I have several local MCPs configured:
$ claude
╭─────────────────────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code research preview! │
│ │
│ /help for help, /status for your current setup │
│ │
│ cwd: /private/tmp/ │
╰─────────────────────────────────────────────────────────────────╯
Tips for getting started:
1. Run /init to create a CLAUDE.md file with instructions for Claude
2. Use Claude to help with file analysis, editing, bash commands and git
3. Be as specific as you would with another engineer for the best results
> /mcp list
⎿ MCP Server Status
• ElevenLabs: connected
• filesystem: connected
• gitlab: connected
• mcp-server-firecrawl: connected
• playwright: connected
• pycharm: connected
• slack: connected
• whatsapp: connected
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ > │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
? for shortcuts ✓ Update installed · Restart to apply
Hope this helps!
@wolffiex @ant-kurt, please advice. Is there a better way to address this? This tools array size restriction seems to be some limit Bedrock is enforcing 🤷♂.
Thanks for the thorough investigation on this @indrasvat - I'm circling back with the team and will provide an update.
@indrasvat - unfortunately we don't have a workaround for this right now, other than passing in fewer tools. Appreciate your investigation on this!
Latest jscodeshift script for claude code 1.x: indrasvat/add-bedrock-tools-check-to-minified-claude-code-cli.js.
I can confirm I'm experiencing this issue as well.
A few questions that would help with debugging:
- Debug logging: Is there a way to enable debug logging in claude-code 1.x to see the actual API requests being made?
- AWS support request: I'm willing to open a support/feature request with AWS to see if they'll consider raising the limit, but they'll likely want to see the exact API calls. Debug logs would help provide that evidence.
- Tool count clarification: I'm trying to understand where all the tools are coming from. My enabled MCP servers only add up to 17 tools, but it seems like there are many built-in tools as well. Could you clarify what the total tool count includes?
Having visibility into the actual requests would help confirm I'm hitting the same error and provide the technical details needed for any AWS escalation.
ANTHROPIC_LOG=debug is the replacement for DEBUG=true.
If your tool count is 17, I wouldn't expect the default tools in Claude Code to be pushing you over 128 total tools. Once you get the debug logs via the above, can you check the limit in the error message?
I opened a AWS support ticket - 175232731800026 and I would encourage others to do the same
This issue has been inactive for 30 days. If the issue is still occurring, please comment to let us know. Otherwise, this issue will be automatically closed in 30 days for housekeeping purposes.
![github-actions[bot] avatar](https://avatars.githubusercontent.com/in/15368?v=4 "Published by a pub.dev verified publisher"){kind=small}
I always got this error when running the /context command in v2.0.x. Only the remote AWS documentation mcp is installed.
/context ⎿ Error: 400 Malformed input request: #: subject must not be valid against schema {"required":["messages"]}#/tools/0: required key [type] not found#/tools/0: extraneous key [input_schema] is not permitted#/tools/0: extraneous key [description] is not permitted#/tools/0/name: #/tools/0/name: mcp__plugin_aws-cdk_aws-documentation-mcp-server__aws___recommend is not a valid enum value#/tools/0: required key [type] not found#/tools/0: required key [display_height_px] not found#/tools/0: required key [display_width_px] not found#/tools/0: extraneous key [input_schema] is not permitted#/tools/0: extraneous key [description] is not permitted#/tools/0/name: #/tools/0/name: mcp__plugin_aws-cdk_aws-documentation-mcp-server__aws___recommend is not a valid enum value#/tools/0: required key [type] not found#/tools/0: extraneous key [input_schema] is not permitted#/tools/0: extraneous key [description] is not permitted#/tools/0/name: mcp__plugin_aws-cdk_aws-documentation-mcp-server__aws___recommend is not a valid enum value#/tools/0/name: #/tools/0/name: expected maxLength: 64, actual: 65#/tools/0/name: string [mcp__plugin_aws-cdk_aws-documentation-mcp-server__aws___recommend] does not match pattern ^[a-zA-Z0-9_-]{1,64}$, please reformat your input and try again.
BTW: ANTHROPIC_LOG=debug does not work for v2.
