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AWS Bedrock Integration

Pallas supports AWS Bedrock through three integration paths, depending on the model and endpoint:

Path fast-agent provider Auth Use when
Direct Bedrock bedrock AWS IAM / long-term key Any Bedrock model; required for Sonnet 4.6
Mantle → Anthropic anthropic Bedrock long-term API key Claude models with Mantle support (Haiku 4.5, Opus 4.7)
Mantle → OpenAI openai Bedrock long-term API key Non-Anthropic models on Mantle (MiniMax M2.5, etc.)

Mantle is AWS's OpenAI-compatible and Anthropic-compatible gateway for Bedrock. It simplifies authentication (one long-term API key instead of IAM credential management) and is the recommended path when the target model supports it.

Supported Models

Model Bedrock model ID Direct Bedrock Mantle
Claude Haiku 4.5 anthropic.claude-haiku-4-5-20251001-v1:0 ✓ ✓ (Anthropic Messages API)
Claude Sonnet 4.6 anthropic.claude-sonnet-4-6 ✓ ✗
Claude Opus 4.7 anthropic.claude-opus-4-7 ✓ ✓ (Anthropic Messages API)
MiniMax M2.5 minimax.minimax-m2.5 ✓ ✓ (OpenAI Chat Completions)

Cross-region inference IDs (e.g. us.anthropic.claude-opus-4-7, eu.anthropic.claude-sonnet-4-6) can be used as the model ID for the bedrock provider to route across regions within a geography for higher throughput.

Path 1: Direct Bedrock (Converse API)

Fast-agent's bedrock provider calls the AWS Bedrock Converse API via boto3. This path works for all Bedrock models and is the only option for models without Mantle support (e.g. Claude Sonnet 4.6).

Prerequisites

  1. Install boto3 — not included in fast-agent by default:

    # pyproject.toml
dependencies = [
    "pallas-mcp @ git+ssh://git@git.helu.ca:22022/r/pallas.git",
    "boto3",
]

  2. AWS credentials — the Bedrock provider uses the standard AWS credential chain in priority order:

    • AWS_BEARER_TOKEN_BEDROCK environment variable (long-term Bedrock API key — see below)
    • AWS_ACCESS_KEY_ID + AWS_SECRET_ACCESS_KEY environment variables
    • ~/.aws/credentials file (named profile or default)
    • IAM instance role (EC2, ECS, Lambda)

    The simplest approach for a server deployment is a long-term Bedrock API key generated from the Amazon Bedrock console. Set it as AWS_BEARER_TOKEN_BEDROCK.

  3. Enable model access in the Bedrock console for your target region.

fastagent.config.yaml

default_model: bedrock.us.anthropic.claude-sonnet-4-6

# ── Model Capabilities ──────────────────────────────────────────────────────
# Required: Bedrock model IDs are not in fast-agent's ModelDatabase.
model_capabilities:
  vision: true                  # true for Claude models (image input supported)
  context_window: 1000000       # 1M for Sonnet 4.6
  max_output_tokens: 64000

# ── Bedrock provider ─────────────────────────────────────────────────────────
bedrock:
  region: us-east-1             # or set AWS_REGION / AWS_DEFAULT_REGION
  profile: default              # optional; or set AWS_PROFILE
  reasoning: medium             # optional: minimal | low | medium | high

The default_model format is bedrock.<model-id>. Use a cross-region inference ID (e.g. us.anthropic.claude-sonnet-4-6) for geo-distributed routing, or the plain model ID (e.g. anthropic.claude-sonnet-4-6) for in-region only.

fastagent.secrets.yaml

No API key entry is needed — credentials come from the AWS credential chain. If you are using a long-term Bedrock API key, set it in .env or the environment:

# fastagent.secrets.yaml — nothing required for Bedrock credentials
# AWS credentials are read from environment variables or ~/.aws/credentials

.env

# Long-term Bedrock API key (recommended for server deployments)
AWS_BEARER_TOKEN_BEDROCK=your-bedrock-api-key

# Or use IAM access keys
# AWS_ACCESS_KEY_ID=AKIA...
# AWS_SECRET_ACCESS_KEY=...

AWS_REGION=us-east-1

agents.yaml

No Bedrock-specific changes are needed. The default_model in fastagent.config.yaml is picked up automatically:

name: my-project
version: "1.0.0"
host: my-host.example.com
registry_port: 8200

agents:
  jarvis:
    module: agents.jarvis
    port: 8201
    title: Jarvis
    description: "My assistant"

To use a different Bedrock model for a specific agent, set model on the agent entry:

agents:
  jarvis:
    module: agents.jarvis
    port: 8201
    model: bedrock.us.anthropic.claude-haiku-4-5-20251001-v1:0
    model_capabilities:
      vision: true
      context_window: 200000
      max_output_tokens: 64000

Model capability reference

Model vision context_window max_output_tokens
Claude Haiku 4.5 true 200000 64000
Claude Sonnet 4.6 true 1000000 64000
Claude Opus 4.7 true 1000000 128000
MiniMax M2.5 false 196000 8000

IAM permissions

The IAM principal (user, role, or instance profile) needs:

{
  "Effect": "Allow",
  "Action": [
    "bedrock:InvokeModel",
    "bedrock:InvokeModelWithResponseStream"
  ],
  "Resource": "arn:aws:bedrock:*::foundation-model/*"
}

For cross-region inference, also allow:

{
  "Effect": "Allow",
  "Action": [
    "bedrock:InvokeModel",
    "bedrock:InvokeModelWithResponseStream"
  ],
  "Resource": "arn:aws:bedrock:*:*:inference-profile/*"
}

Terraform snippet

resource "aws_iam_policy" "bedrock_invoke" {
  name = "bedrock-invoke"

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Effect = "Allow"
        Action = [
          "bedrock:InvokeModel",
          "bedrock:InvokeModelWithResponseStream",
        ]
        Resource = [
          "arn:aws:bedrock:*::foundation-model/*",
          "arn:aws:bedrock:*:*:inference-profile/*",
        ]
      }
    ]
  })
}

Path 2: Mantle — Anthropic Messages API

Mantle exposes the Anthropic Messages API for supported Claude models. Fast-agent's anthropic provider uses the Anthropic Python SDK (AsyncAnthropic), which calls /v1/messages — exactly what Mantle serves at https://bedrock-mantle.{region}.api.aws/anthropic.

Supported models: Claude Haiku 4.5, Claude Opus 4.7. Claude Sonnet 4.6 does not have a Mantle endpoint and must use Path 1.

Note on Opus 4.7 and Chat Completions: The AWS model card notes that Opus 4.7 does not support Chat Completions on Mantle. This does not affect fast-agent — the anthropic provider uses the Anthropic Messages API, not Chat Completions.

Prerequisites

  1. Generate a long-term Bedrock API key from the Amazon Bedrock console.

  2. Enable model access in the Bedrock console for your target region.

  3. No additional Python packages needed — anthropic is already a fast-agent dependency.

fastagent.config.yaml

default_model: anthropic.claude-opus-4-7

# ── Anthropic provider pointing at Mantle ────────────────────────────────────
anthropic:
  base_url: "https://bedrock-mantle.us-east-1.api.aws/anthropic"

That's the whole configuration. Pallas auto-detects the bedrock-mantle hostname in anthropic.base_url at startup and installs two compatibility shims so fast-agent's default request shape matches what Mantle expects (see pallas/mantle_shims.py):

  1. Wire-name prefix — re-adds the anthropic. prefix that fast-agent's parser strips off, because Mantle requires the full anthropic.claude-opus-4-7 wire id. Without this shim you get 404 "The model '...' does not exist".

  2. caller: null strip — drops the stray caller field Anthropic SDK 0.100.x leaks onto replayed tool_use blocks (upstream issue anthropics/anthropic-sdk-python#1454). Mantle's validator rejects caller: null with "tool_use.caller: Input should be a valid dictionary or object", which would otherwise break the MCP tool-use loop on the second turn.

The Anthropic SDK appends /v1/messages to base_url automatically.

Feature support. Mantle accepts the same Messages API request shape as api.anthropic.com once the shims are in place, including full MCP tool use (tools, tool_use/tool_result content blocks). Extended thinking, task budget, web_fetch/web_search server tools, and explicit prompt caching (cache_control) are not available via Mantle and should be left off in agent code when targeting Mantle — fast-agent's ModelDatabase entries already disable the ones the Anthropic SDK 0.100.x would otherwise auto-attach.

fastagent.secrets.yaml

anthropic:
  api_key: "${BEDROCK_API_KEY}"

.env

BEDROCK_API_KEY=your-bedrock-long-term-api-key

agents.yaml

No Bedrock-specific changes needed. Example:

name: my-project
version: "1.0.0"
host: my-host.example.com
registry_port: 8200

agents:
  jarvis:
    module: agents.jarvis
    port: 8201
    title: Jarvis
    description: "My assistant"

IAM permissions

No IAM permissions are required when using a long-term Bedrock API key. The key itself carries the necessary access. If you need to restrict which models the key can invoke, use resource-based policies in the Bedrock console.

Path 3: Mantle — OpenAI Chat Completions

Mantle exposes an OpenAI-compatible Chat Completions endpoint (/v1) for non-Anthropic models such as MiniMax M2.5. Fast-agent's openai provider (or generic provider) can point at this endpoint.

Supported models: MiniMax M2.5 (minimax.minimax-m2.5), and any other Bedrock model that Mantle exposes via Chat Completions.

Prerequisites

  1. Generate a long-term Bedrock API key from the Amazon Bedrock console.

  2. Enable model access in the Bedrock console for your target region.

fastagent.config.yaml

default_model: openai.minimax.minimax-m2.5

# ── Model Capabilities ──────────────────────────────────────────────────────
model_capabilities:
  vision: false
  context_window: 196000
  max_output_tokens: 8000

# ── OpenAI provider pointing at Mantle ───────────────────────────────────────
openai:
  base_url: "https://bedrock-mantle.us-east-1.api.aws/v1"

fastagent.secrets.yaml

openai:
  api_key: "${BEDROCK_API_KEY}"

.env

BEDROCK_API_KEY=your-bedrock-long-term-api-key

Health Checks

Startup preflight

Pallas's validate_llm_providers() runs at startup and checks:

Provider What is checked
anthropic GET {base_url}/v1/models/{model} — confirms model exists and key is valid
openai GET {base_url}/models — lists models, confirms configured model is present
bedrock No preflight check — credential errors surface on the first inference call

For the bedrock provider, startup will succeed even with missing or invalid credentials. The first agent call will raise a ProviderKeyError with a message directing you to configure AWS credentials.

Runtime get_health tool

The get_health MCP tool probes downstream MCP servers regardless of which LLM provider is active. LLM provider health (from the startup preflight) is included in the response for anthropic and openai providers. For bedrock, the LLM section of the health response will be absent.

Troubleshooting

NoCredentialsError / ProviderKeyError: AWS credentials not found

The bedrock provider could not find AWS credentials. Check in order:

  1. Is AWS_BEARER_TOKEN_BEDROCK set in .env or the environment?
  2. Is ~/.aws/credentials present and does it contain the expected profile?
  3. Is the IAM role attached to the instance/container?

Model not found in ModelDatabase

KeyError: 'anthropic.claude-sonnet-4-6'

Pallas requires model_capabilities in fastagent.config.yaml for any model not in fast-agent's built-in database. All Bedrock model IDs fall into this category. Add:

model_capabilities:
  vision: true          # or false
  context_window: 1000000
  max_output_tokens: 64000

ValidationError on default_model

The default_model format must be provider.model-id. Examples:

default_model: bedrock.us.anthropic.claude-sonnet-4-6   # Direct Bedrock, geo inference
default_model: bedrock.anthropic.claude-sonnet-4-6       # Direct Bedrock, in-region
default_model: anthropic.claude-opus-4-7                 # Mantle via Anthropic provider
default_model: openai.minimax.minimax-m2.5               # Mantle via OpenAI provider

Cross-region inference access denied

If you use a geo inference ID (e.g. us.anthropic.claude-sonnet-4-6) and receive an access denied error, ensure the IAM policy includes arn:aws:bedrock:*:*:inference-profile/* in the Resource list. In-region model IDs do not require this.

Mantle 401 Unauthorized

The Bedrock long-term API key is invalid or expired. Regenerate it from the Bedrock console and update BEDROCK_API_KEY in .env.

Claude Sonnet 4.6 on Mantle returns 404

Claude Sonnet 4.6 does not have a Mantle endpoint. Use the bedrock provider (Path 1) with model ID anthropic.claude-sonnet-4-6 or the geo inference ID us.anthropic.claude-sonnet-4-6.

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