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OSCAL ToolsCAUTION

mcp/awslabs/oscal-tools
MCP server by awslabs · compliance as code · compliance automation · continuous compliance · Audited 2026-10-08
⚑ Report / re-scanSource ↗

OSCAL tools for AI agents

Verdict
CAUTION
Grade
C
Trust score
78 /100
Exposed tools
1 1r · 0w · 0d
Transport
stdio · streamable-http
License
Apache-2.0
Stars
53
01

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

[![PyPI][pypi-badge]][pypi-url] [][pypi-url] [%22&replace=%241&label=OSCAL)][nist-oscal-url]

[pypi-badge]: https://img.shields.io/pypi/v/mcp-server-for-oscal.svg [pypi-url]: https://pypi.org/project/mcp-server-for-oscal/ [nist-oscal-url]: https://pages.nist.gov/OSCAL/ [mcp-spec-url]: https://modelcontextprotocol.io/docs/getting-started/intro [issues-url]: https://github.com/awslabs/mcp-server-for-oscal/issues/ [new-issue-url]: https://github.com/awslabs/mcp-server-for-oscal/issues/new

Instant OSCAL expertise for your favorite AI agent

A Model Context Protocol (MCP) server that provides AI assistants (Claude, Cline, Kiro, Claude Code, etc.) with tools to work with NIST's Open Security Controls Assessment Language (OSCAL). Like many early adopters, we needed help implementing OSCAL proofs-of-concept to demonstrate value to business stakeholders. Perhaps due to limited availability of examples in the public domain, we found that most AI agents/LLMs alone produced inconsistent results related to OSCAL. The tools in this MCP server minimized that problem for our use-case and we hope it does the same for you.

[!TIP] To get started, see Installation below.

Features

Together, the t

Read from source at commit 28a1cb527d65OBSERVED · 2026-10-08
02

Connect

Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control. Replace the environment placeholders with a token scoped to the least it needs.

claude-code (pypi)
claude mcp add mcp-server-for-oscal -- None mcp-server-for-oscal==0.0.0
03

Exposed tools (1)

1 read · 0 write · 0 destructive.

ToolRiskDescription
aboutreadreturn {
04

Trust audit

CAUTIONgrade C · trust 78/100 Install with care. The audit found things worth knowing before you trust its output.

LayerWhat it checksResult
L0Provenance & inventoryWARN
L1Static analysis of the codeWARN
L2Instruction surface (what it tells the agent)PASS
L3Class-specific surfacePASS
L4Behavioural (sandbox)SKIPPED

What the source does

Filesystem
declared (1 observation(s))
Network
declared (5 observation(s))
Shell
declared (3 observation(s))
Dependencies
pinned
Secrets in source
none-found

Findings (15)

MEDIUMInventory / provenance · inv.binary · CWE-1104
data/component_definitions/aws-oscal-content-v0.2.0.zip
aws-oscal-content-v0.2.0.zip
Why it matters. a compiled or binary member cannot be reviewed from source
Fix. ship source, or explain the binary in the README
MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95
src/mcp_server_for_oscal/tools/oscal_store.py:515
mod = importlib.import_module(module_name)
MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95
src/mcp_server_for_oscal/tools/oscal_store.py:1276
mod = importlib.import_module(module_name)
MEDIUMCode injection · code.dynamic_import · CWE-78, CWE-94, CWE-95
src/mcp_server_for_oscal/tools/validate_oscal_content.py:164
mod = importlib.import_module(module_path)
LOWInventory / provenance · inv.hidden_file · CWE-1104
.kiro/specs/agent-session-state/.config.kiro
.config.kiro
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWInventory / provenance · inv.hidden_file · CWE-1104
.kiro/specs/build-db-bundled-seeding/.config.kiro
.config.kiro
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWInventory / provenance · inv.hidden_file · CWE-1104
.kiro/specs/drop-bundled-raw-content/.config.kiro
.config.kiro
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWInventory / provenance · inv.hidden_file · CWE-1104
.kiro/specs/list-tools-pagination/.config.kiro
.config.kiro
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWInventory / provenance · inv.hidden_file · CWE-1104
.kiro/specs/local-documentation-search/.config.kiro
.config.kiro
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWPrompt injection · prompt.transfer_instruction · CWE-94, CWE-1427
.kiro/specs/oscal-agent-production/design.md:5
This design covers the refactoring of the `oscal_agent.py` module from an unused prototype into a production-ready Strands agent, along with centralizing the tool registry so both the MCP server and t
Why it matters. an instruction to move sensitive data to an outside destination
Fix. remove; a skill never needs the user's secrets off the machine
INFOPrompt injection · prompt.credential_read · CWE-94, CWE-1427
.kiro/specs/agent-session-state/design.md:90
These are read from environment variables in `__init__` following the existing pattern:
Why it matters. asks the agent to read credentials
INFOPrompt injection · prompt.credential_read · CWE-94, CWE-1427
.kiro/specs/agent-session-state/requirements.md:96
1. THE Config class SHALL read an `OSCAL_AGENT_SESSION_STORAGE` environment variable with allowed values `file`, `s3`, or empty string.
Why it matters. asks the agent to read credentials
INFOPrompt injection · prompt.credential_read · CWE-94, CWE-1427
.kiro/specs/agent-session-state/requirements.md:97
2. THE Config class SHALL read an `OSCAL_AGENT_SESSION_DIR` environment variable for the File_Session_Manager directory path.
Why it matters. asks the agent to read credentials
INFOPrompt injection · prompt.credential_read · CWE-94, CWE-1427
.kiro/specs/agent-session-state/requirements.md:98
3. THE Config class SHALL read an `OSCAL_AGENT_SESSION_S3_BUCKET` environment variable for the S3_Session_Manager bucket name.
Why it matters. asks the agent to read credentials
INFOPrompt injection · prompt.credential_read · CWE-94, CWE-1427
.kiro/specs/agent-session-state/requirements.md:99
4. THE Config class SHALL read an `OSCAL_AGENT_SESSION_S3_PREFIX` environment variable for the S3_Session_Manager key prefix.
Why it matters. asks the agent to read credentials

Gates applied: no_behavioural_pass.

Audited 2026-10-08 · audit v0.4.1 · source sha 28a1cb527d65full audit observations/trust-audit/mcp-server/awslabs__oscal-tools.json · Report an issue / request a re-scan
05

Audit history

Every audit this server has had. A grade with a past is a grade somebody is still checking.

DateSourceVerdictGradeScoreChange
2026-10-0828a1cb527d65CAUTIONC78first audit
06

Questions

What is the OSCAL Tools MCP server?

OSCAL tools for AI agents

What tools does OSCAL Tools expose?

1 in total: 1 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.

Is OSCAL Tools safe to connect to an agent?

With care. The audit graded it C (78/100) and found 15 things worth knowing before you trust this server, listed below with the exact line each was found on.

What credentials does OSCAL Tools need?

It reads OSCAL_AGENT_MAX_TOKENS from the environment. Give it a token scoped to the least it needs — an agent that can be talked into calling a tool can be talked into calling it with your credentials.

How does OSCAL Tools run?

It speaks stdio and streamable-http, so it runs as a local process your client starts. It is published on PyPI as mcp-server-for-oscal.

How current is this page?

The grade is for one exact copy of the source (28a1cb527d65), read on 2026-10-08. The repository is watched and re-audited when it changes.

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