feat: update max length for bedrock agent instructions to 20k

[seabornejack]

Description

AWS have updated the maximum instruction character count from 8000 to 20000. The current provider version allows 40 - 8000 characters in the instruction argument.

The below command can validate this new default service quota.

❯ aws service-quotas get-service-quota --service-code bedrock --quota-code L-6E3CDA2D --output table

Output:

----------------------------------------------------------------------------------------------
|                                       GetServiceQuota                                      |
+--------------------------------------------------------------------------------------------+
||                                           Quota                                          ||
|+----------------------+-------------------------------------------------------------------+|
||  Adjustable          |  False                                                            ||
||  GlobalQuota         |  False                                                            ||
||  QuotaAppliedAtLevel |  ACCOUNT                                                          ||
||  QuotaArn            |  arn:aws:servicequotas:eu-west-2:<redacted>:bedrock/L-6E3CDA2D    ||
||  QuotaCode           |  L-6E3CDA2D                                                       ||
||  QuotaName           |  Characters in Agent instructions                                 ||
||  ServiceCode         |  bedrock                                                          ||
||  ServiceName         |  Amazon Bedrock                                                   ||
||  Unit                |  None                                                             ||
||  Value               |  20000.0                                                          ||
|+----------------------+-------------------------------------------------------------------+|

Relations

• Relates [Bug]: aws_bedrockagent_agent "instruction" attribute validator max should be changed from 4000 to 8000 #40236
  Closed bug relating to the previous increase to 8000 characters.
• Relates feat: update max length for bedrock agent instructions #40279
  Previous character count increase completed by @stefanfreitag

References

Bedrock Quotas

Output from Acceptance Testing

make testacc ACCTEST_PARALLELISM=3 TESTS=TestAccBedrockAgentAgent_ PKG=bedrockagent 
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.8 test ./internal/service/bedrockagent/... -v -count 1 -parallel 3 -run='TestAccBedrockAgentAgent_'  -timeout 360m -vet=off
2025/05/13 14:24:58 Initializing Terraform AWS Provider...
=== RUN   TestAccBedrockAgentAgent_basic
=== PAUSE TestAccBedrockAgentAgent_basic
=== RUN   TestAccBedrockAgentAgent_full
=== PAUSE TestAccBedrockAgentAgent_full
=== RUN   TestAccBedrockAgentAgent_singlePrompt
=== PAUSE TestAccBedrockAgentAgent_singlePrompt
=== RUN   TestAccBedrockAgentAgent_singlePromptUpdate
=== PAUSE TestAccBedrockAgentAgent_singlePromptUpdate
=== RUN   TestAccBedrockAgentAgent_addPrompt
=== PAUSE TestAccBedrockAgentAgent_addPrompt
=== RUN   TestAccBedrockAgentAgent_guardrail
=== PAUSE TestAccBedrockAgentAgent_guardrail
=== RUN   TestAccBedrockAgentAgent_update
=== PAUSE TestAccBedrockAgentAgent_update
=== RUN   TestAccBedrockAgentAgent_tags
=== PAUSE TestAccBedrockAgentAgent_tags
=== RUN   TestAccBedrockAgentAgent_kms
=== PAUSE TestAccBedrockAgentAgent_kms
=== RUN   TestAccBedrockAgentAgent_agentCollaboration
=== PAUSE TestAccBedrockAgentAgent_agentCollaboration
=== RUN   TestAccBedrockAgentAgent_memoryConfiguration
=== PAUSE TestAccBedrockAgentAgent_memoryConfiguration
=== CONT  TestAccBedrockAgentAgent_basic
=== CONT  TestAccBedrockAgentAgent_agentCollaboration
=== CONT  TestAccBedrockAgentAgent_guardrail
--- PASS: TestAccBedrockAgentAgent_basic (35.44s)
=== CONT  TestAccBedrockAgentAgent_tags
--- PASS: TestAccBedrockAgentAgent_agentCollaboration (53.14s)
=== CONT  TestAccBedrockAgentAgent_kms
--- PASS: TestAccBedrockAgentAgent_guardrail (102.22s)
=== CONT  TestAccBedrockAgentAgent_singlePromptUpdate
--- PASS: TestAccBedrockAgentAgent_tags (82.34s)
=== CONT  TestAccBedrockAgentAgent_addPrompt
--- PASS: TestAccBedrockAgentAgent_kms (66.68s)
=== CONT  TestAccBedrockAgentAgent_memoryConfiguration
--- PASS: TestAccBedrockAgentAgent_memoryConfiguration (35.35s)
=== CONT  TestAccBedrockAgentAgent_update
--- PASS: TestAccBedrockAgentAgent_singlePromptUpdate (57.65s)
=== CONT  TestAccBedrockAgentAgent_singlePrompt
--- PASS: TestAccBedrockAgentAgent_singlePrompt (34.80s)
=== CONT  TestAccBedrockAgentAgent_full
--- PASS: TestAccBedrockAgentAgent_addPrompt (105.40s)
--- PASS: TestAccBedrockAgentAgent_update (77.94s)
--- PASS: TestAccBedrockAgentAgent_full (38.47s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/bedrockagent       240.645s

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.

[ewbankkit]

LGTM 🚀.

[github-actions]

Warning

This Issue has been closed, meaning that any additional comments are much easier for the maintainers to miss. Please assume that the maintainers will not see them.

Ongoing conversations amongst community members are welcome, however, the issue will be locked after 30 days. Moving conversations to another venue, such as the AWS Provider forum, is recommended. If you have additional concerns, please open a new issue, referencing this one where needed.

[ewbankkit]

@seabornejack Thanks for the contribution 🎉 👏.

[github-actions]

Warning

This Issue has been closed, meaning that any additional comments are much easier for the maintainers to miss. Please assume that the maintainers will not see them.

Ongoing conversations amongst community members are welcome, however, the issue will be locked after 30 days. Moving conversations to another venue, such as the AWS Provider forum, is recommended. If you have additional concerns, please open a new issue, referencing this one where needed.

[github-actions]

This functionality has been released in v5.98.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!