ISM MCP Server
The ISM MCP Server provides comprehensive access to the Australian Cyber Security Centre's Information Security Manual (ISM), enabling version management, control browsing, search, comparison, and compliance analysis.
Tools:
list_versions— Enumerate all published ISM releases (historical, current, and future).get_version_metadata— Retrieve OSCAL metadata and control/group counts for any release.list_groups— Browse the hierarchical chapter/guideline/section structure with control counts.list_controls— Paginated, filtered list of controls by applicability (NC, OS, P, S, TS), group, or label prefix.search_controls— Full-text search across labels, titles, statements, and group paths.get_control— Full details for a single control by OSCAL ID or human label (e.g.GOV-01), in JSON or Markdown.get_controls— Fetch full details for multiple controls in one call, with optional deduplication.compare_versions— Diff two ISM releases to identify added, removed, and modified controls.list_profiles— List eight OSCAL profiles: five classification baselines and three Essential Eight maturity levels.get_profile_controls— Retrieve the resolved control set for a given profile and version.cache_info— Inspect the local cache directory, sizes, file counts, and offline status.
Resources:
ism://catalog/{version}— Full OSCAL catalog JSON for any version.ism://catalog/{version}/control/{controlId}— A single control rendered as Markdown.ism://profile/{version}/{profile}— Resolved OSCAL profile catalog for a baseline.
Prompts:
ism_compliance_check— Generate a structured compliance assessment of a system against a baseline.ism_change_brief— Produce a change-management brief between two ISM releases.
Deployment: Runs locally via stdio or as an HTTP server (MCP Streamable HTTP), and integrates with LLM clients such as VS Code and Claude Desktop.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@ISM MCP Serverwhat's the latest ISM version?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
ism-mcp
A Model Context Protocol server that serves the Australian Cyber Security Centre (ACSC) Information Security Manual (ISM) to MCP-capable LLM clients (Claude Desktop, VS Code, Cursor, Continue, etc.).
Data is sourced live from the official ASD/ACSC OSCAL mirror:
Each git tag in that repository is one published ISM release. The server discovers tags dynamically via the GitHub API, so:
All historical versions back to
v2022.09.14are available.The current version is whichever tag is newest.
Future versions automatically appear the moment ASD publishes a new tag — no code changes or redeploys required.
Catalog and profile JSON is cached on disk (default
~/.cache/ism-mcp/, override with ISM_MCP_CACHE_DIR). Tag listings are
refreshed every six hours (override with ISM_MCP_TAGS_TTL_MS).
Capabilities
Tools
Tool | Purpose |
| Enumerate every published ISM release (tag, id, SHA, date). |
| OSCAL metadata + control/group counts for a version. |
| Hierarchical chapter/guideline structure with control counts. |
| Paginated list of controls, filterable by applicability / group / label prefix. |
| Full-text search across labels, titles, statements, and group paths. |
| Full detail for a single control by OSCAL id or human label (e.g. |
| Full detail for multiple controls in one call, with unmatched identifiers and optional deduplication. |
| Diff two ISM releases — added, removed, and modified controls. |
| List the eight OSCAL profiles (NC / OS / P / S / TS + E8 ML1/2/3). |
| Resolved set of controls for a given baseline or Essential Eight maturity level. |
| Inspect the local cache. |
Resources (templates)
ism://catalog/{version}— full OSCAL catalog JSON (uselatestor e.g.2026.03.24).ism://catalog/{version}/control/{controlId}— a single control rendered as Markdown.ism://profile/{version}/{profile}— OSCAL resolved-profile catalog for a baseline.
Prompts
ism_compliance_check— generate a structured compliance assessment of a system against a baseline.ism_change_brief— produce a change-management brief between two ISM releases.
Related MCP server: fedramp-docs-mcp
Install / build
npm install
npm run buildThe compiled entrypoint is dist/index.js and is exposed as the ism-mcp bin.
Run
The server speaks MCP over stdio:
node dist/index.jsFor interactive exploration, use the official inspector:
npm run inspectWire it into a client
VS Code (.vscode/mcp.json or settings)
{
"servers": {
"ism": {
"command": "node",
"args": ["/absolute/path/to/ism-mcp/dist/index.js"],
},
},
}Claude Desktop (claude_desktop_config.json)
{
"mcpServers": {
"ism": {
"command": "node",
"args": ["/absolute/path/to/ism-mcp/dist/index.js"],
},
},
}Optional environment
Variable | Purpose |
| Override on-disk cache directory. |
| Tag-list cache TTL in milliseconds (default 6h). |
Example prompts to try
"What ISM versions are available?"
"Show me GOV-01 from the latest ISM, in Markdown."
"Search for ISM controls about multi-factor authentication that apply to PROTECTED."
"Compare ISM 2025.12.9 with the latest release and summarise the changes."
"List the controls in the Essential Eight ML2 baseline for the latest ISM."
Data and licensing
The ISM is published by the Australian Signals Directorate. See the upstream repository and https://www.cyber.gov.au for terms of use. This server is an unaffiliated tool that consumes the publicly published OSCAL data.
CI / CD
Three GitHub Actions workflows ship with the repo:
.github/workflows/ci.yml— type-checks, builds, and runs the offline smoke test on every push and PR..github/workflows/release.yml— dispatched by CI after a successfulmainbuild when a new version tag is created (or by manual dispatch), bundles the latest data, builds, packs the tarball, generates checksums, creates a GitHub Release with the tarball anddata/index.jsonattached, updates a rollinglatestgit tag to the released commit, and (optionally) publishes to npm. If Cloudflare credentials are configured, it deploys a Cloudflare Worker that serves the site and exposes the MCP Streamable HTTP endpoint at/mcp(manual dispatch can disable this viadeploy_cloudflare=false)..github/workflows/upstream-sync.yml— checks the upstream ACSC ISM OSCAL repository on a daily schedule (or manual dispatch). When a new ISM tag is published upstream, it rebundlesdata/, bumps the package patch version, commits the update tomain, and lets CI trigger the tagged release and Cloudflare deployment.
One-time repository setup
Settings → Actions → General → Workflow permissions: Read and write.
(Optional) configure repository credentials for npm publish on release.
Update the
repository,homepage, andbugsfields inpackage.json(replaceOWNER).(Optional) configure Cloudflare account credentials in repository secrets to enable Workers deployment on release.
Cutting a release
# bump version
npm version patch # or minor / major
git push --follow-tagsManual releases run CI first; when CI succeeds on main, it creates the version tag and dispatches release.yml, which builds an offline-ready ism-mcp-<version>.tgz, attaches it to the GitHub Release, and (optionally) publishes the package to npm and deploys the Cloudflare Worker endpoint.
Upstream ISM releases are also checked automatically once per day. If a new upstream tag is detected, the sync workflow rebundles the data, bumps the package version, pushes the update to main, and the existing CI and release workflows take over from there.
For remote AI clients, add the remote MCP server with this URL:
https://ism.mcp.zta.au/mcp
{
"servers": {
"ism": {
"type": "http",
"url": "https://ism.mcp.zta.au/mcp",
},
},
}Remote MCP / HTTP transport
Beyond stdio, ism-mcp also speaks MCP Streamable HTTP so it can be hosted as a remote endpoint that AI tools query over the network.
# run as an HTTP server on :8080
MCP_TRANSPORT=http PORT=8080 node dist/index.js
# or via flag
node dist/index.js --httpEndpoints:
POST /mcp— JSON-RPC over Streamable HTTP (per-session viaMcp-Session-Idheader).GET /health— liveness probe.GET /— plain-text usage hint.GET /.well-known/oauth-protected-resource/mcp— protected resource metadata for MCP OAuth discovery.GET /.well-known/oauth-authorization-server— authorization server metadata.POST /register— dynamic client registration.POST /token— token issuance for registered clients usingclient_credentials.
The hosted Cloudflare deployment supports dynamic client registration and client_credentials token exchange in addition to unauthenticated MCP access.
For durable client registrations and issued tokens across Worker restarts, bind a Cloudflare KV namespace as AUTH_KV. If AUTH_KV is not configured, the Worker falls back to in-memory auth state.
Environment variables:
Variable | Purpose |
|
|
| Bind address (defaults: |
| URL path for the MCP endpoint (default |
Connect a client to the remote endpoint
Hosted endpoint: https://ism.mcp.zta.au/mcp
// VS Code .vscode/mcp.json
{
"servers": {
"ism": {
"type": "http",
"url": "https://ism.mcp.zta.au/mcp",
},
},
}Available Tools
11 toolscache_infoInspect ISM MCP storageA
Reports the bundled offline data directory, the writable user cache directory, sizes, file counts, and whether the server is running in offline mode (ISM_MCP_OFFLINE).
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It discloses the outputs (directories, sizes, counts, offline mode) but does not mention any side effects, performance impact, or required permissions, which are minimal for a read-only info tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single sentence that front-loads the main purpose and uses no unnecessary words. Every word contributes to understanding the tool's output.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with no parameters and no output schema, the description provides a clear list of reported items. It could be improved by mentioning if the data is real-time or cached, but it is largely complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
There are zero parameters, so the schema coverage is trivially 100%. The description adds meaning by explaining what the tool reports, which is beyond what the schema offers.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb 'reports' and lists the exact resources: bundled offline data directory, writable user cache directory, sizes, file counts, and offline mode status. It clearly distinguishes itself from sibling tools that handle controls, versions, and profiles.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for checking storage and offline status, but lacks explicit guidance on when to prefer it over siblings or when not to use it. No alternatives or exclusions are mentioned.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
compare_versionsCompare two ISM versionsA
Computes the diff between two ISM releases: controls added, removed, and modified (title, statement, or applicability changes). Useful for change-management and gap analysis.
| Name | Required | Description | Default |
|---|---|---|---|
| from | Yes | Older version, e.g. "2025.12.9". | |
| to | Yes | Newer version, e.g. "2026.03.24". Use "latest" for the current. | |
| includeBodies | No | Include before/after statements for modified controls (verbose). |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It honestly discloses that the tool computes added, removed, and modified controls, and mentions the includeBodies parameter makes output verbose. However, it does not address potential side effects, rate limits, or the read-only nature, though the operation is clearly non-destructive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is composed of two tightly focused sentences. The first sentence defines the core functionality and output details, and the second sentence provides a use case. No extraneous information, making it highly efficient.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the lack of an output schema, the description does not explain the return format or structure, which an agent might need to process results. It also does not mention any prerequisites or error conditions. While the core function is clear, additional context would improve completeness.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has 100% coverage with clear descriptions for all three parameters (from, to, includeBodies). The tool description does not add additional meaning beyond the schema, so a baseline score of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Computes the diff') and the resource ('between two ISM releases'), specifying the exact types of changes included (added, removed, modified with details). This distinguishes it from sibling tools like list_versions or get_control, which serve different purposes.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description mentions it is 'useful for change-management and gap analysis,' providing context for use. However, it does not explicitly state when not to use this tool or suggest alternatives (e.g., using get_control for a single version or list_versions for version listing).
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_controlGet a single ISM controlA
Returns the full detail (title, group path, applicability, statement) for a single ISM control. Accepts either the OSCAL id (e.g. ism-principle-gov-01) or the human label (e.g. GOV-01).
| Name | Required | Description | Default |
|---|---|---|---|
| controlId | Yes | Either OSCAL id (e.g. "ism-principle-gov-01") or label (e.g. "GOV-01"). | |
| version | No | ||
| format | No |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It describes the operation as returning details, but does not mention error handling (e.g., if controlId not found) or confirm it is read-only. For a simple get, this is adequate but not comprehensive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two sentences: first states purpose and output, second explains input. It is front-loaded and contains no unnecessary words.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (single control fetch, 3 parameters, no output schema), the description is fairly complete. It explains what is returned and how to specify the control. Minor omission: behavior when controlId is invalid or version is omitted, but overall sufficient.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is low (33%: only controlId has a description). The description adds value by explaining the two accepted formats for controlId, but it does not add semantics for version or format beyond what the schema provides (enum for format, no description for version).
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool returns full detail for a single ISM control, listing specific fields (title, group path, applicability, statement). It distinguishes from sibling tools like list_controls or get_controls which handle multiple controls.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explains when to use this tool (when a single control's details are needed) and how to identify it (OSCAL id or human label). However, it does not explicitly state when not to use it or provide direct comparisons to alternatives, though context is clear.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_controlsGet multiple ISM controlsB
Returns full detail for multiple ISM controls in one call. Accepts OSCAL ids and/or human labels (e.g. GOV-01).
| Name | Required | Description | Default |
|---|---|---|---|
| controlIds | Yes | Control identifiers to resolve, each as OSCAL id (e.g. "ism-principle-gov-01") or label (e.g. "GOV-01"). | |
| version | No | ||
| format | No | ||
| deduplicate | No | If true, return each matched control once by control id. If false, preserve duplicates in requested order. |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It mentions 'full detail' but does not describe side effects, authorization, errors, or the response structure. Without output schema, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two sentences, front-loaded with purpose, and contains no fluff. Every sentence earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has 4 parameters, no output schema, and no annotations, the description lacks details on optional parameters, response format, error behavior, or usage context. It is too minimal for a batch retrieval tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description only reiterates the controlIds parameter info already in the schema (OSCAL ids or human labels). It adds no new meaning for version, format, or deduplicate. With 50% schema coverage, it fails to compensate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool returns full detail for multiple ISM controls in one call, using a specific verb and resource. It distinguishes from sibling tools like get_control (single) and list_controls (likely listing IDs/summaries).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for batch retrieval by saying 'multiple ... in one call,' but does not explicitly state when not to use or mention alternatives like get_control for single controls. Guidance is implicit.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_profile_controlsGet controls for an ISM OSCAL profileB
Returns the resolved set of controls included in a given ISM OSCAL profile (classification baseline or Essential Eight maturity level) for a given version.
| Name | Required | Description | Default |
|---|---|---|---|
| profile | Yes | ||
| version | No | ||
| limit | No | ||
| offset | No |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, so the description must disclose behavior. It describes the return type (resolved set of controls) but does not explain pagination behavior for `limit` and `offset`, default values for `version`, or any side effects. For a read tool, this is minimal but incomplete.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single sentence with no redundancy. Every word contributes to the core purpose. It is appropriately front-loaded and efficient.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given 4 parameters, no output schema, and many siblings, the one-sentence description is insufficient. It lacks details on pagination, default behavior, parameter constraints, and how it relates to similar tools. The description misses critical context for effective use.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 0%, so description must add meaning. It mentions `profile` and `version` generically but does not describe `limit` and `offset` at all. The enum for profile is not elaborated beyond the brief mention of classification and E8 levels.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool returns the resolved set of controls for a given ISM OSCAL profile and version. It specifies the profile types (classification baseline or Essential Eight maturity level), distinguishing it from siblings like `get_control` or `list_controls` which have different scopes.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies use when you need controls for a specific profile version, but it lacks explicit guidance on when to use this tool versus alternatives like `list_controls` or `get_controls`. No when-not or comparative context is given.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_version_metadataGet ISM version metadataA
Returns OSCAL metadata (title, version, last-modified, oscal-version) for a given ISM release. Use "latest" or omit to get the most recent.
| Name | Required | Description | Default |
|---|---|---|---|
| version | No | e.g. "2026.03.24" or "latest". Default: latest. |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, description fully carries the burden. It discloses the return type and fields, implying a read-only operation. Could be more explicit about side effects (none) and potential authentication needs, but overall adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two succinct sentences with no wasted words. Front-loaded with the action ('Returns OSCAL metadata') and immediately provides usage guidance.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given no output schema, the description explains what fields are returned, which is sufficient for an agent. Missing details like error handling or prerequisites, but overall adequate for the tool's simplicity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The single parameter 'version' has schema description coverage of 100%, and the tool description repeats essentially the same information. No additional semantic context is added beyond what the schema provides, so baseline score of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description clearly states the tool returns OSCAL metadata for a given ISM release, with specific fields enumerated. This distinguishes it from sibling tools like get_control or list_versions.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Provides explicit guidance on using the 'version' parameter, including the 'latest' option and default behavior. Does not mention when not to use the tool or alternative tools, but context is clear for a simple retrieval tool.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
list_controlsList ISM controlsC
Returns a paginated, filtered list of ISM controls. Supports filters by applicability, group/section name (substring), and label prefix (e.g. "GOV", "AC", "PHYS").
| Name | Required | Description | Default |
|---|---|---|---|
| version | No | ||
| applicability | No | Applicability marking: NC=Non-classified, OS=OFFICIAL: Sensitive, P=PROTECTED, S=SECRET, TS=TOP SECRET. | |
| group | No | Substring match against group/chapter titles. | |
| labelPrefix | No | Match controls whose label starts with this prefix, e.g. "GOV". | |
| limit | No | ||
| offset | No |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must fully disclose behavior. It mentions pagination and filters but lacks details on pagination defaults, maximum results, sorting, authentication needs, or response format. This is insufficient for a safe agent call.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two concise sentences front-load the core purpose and filters. No redundant text, though pagination behavior could be more explicit without bloating length.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given no output schema, no annotations, and 6 parameters, the description is moderately complete. It covers filtering but lacks pagination details, response structure, and version context, leaving gaps for the agent.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 50%, and the description repeats information already in the schema for applicability, group, and labelPrefix. It adds no new meaning for version, limit, or offset, leaving those parameters underdocumented.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses specific verbs ('Returns') and resource ('list of ISM controls'), clearly stating it is paginated and filterable. It indirectly differentiates from siblings like get_control (single) and search_controls (broader search) by emphasizing filtering capabilities.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit guidance on when to use this tool versus alternatives like get_control, get_controls, or search_controls. The description implies use for filtered listing but does not state when not to use it or provide context for selection among siblings.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
list_groupsList ISM groups (chapters and guidelines)B
Returns the hierarchical group structure of the ISM catalog (chapters, guidelines, sections) with control counts at each level.
| Name | Required | Description | Default |
|---|---|---|---|
| version | No | ||
| maxDepth | No |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations provided, and the description only states it returns hierarchical data without disclosing read-only nature, side effects, or performance implications. It fails to fully characterize behavior beyond the basic operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single efficient sentence without wasted words, but it lacks structure like bullet points for clarity. Still, it is appropriately brief.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given no output schema, no annotations, and 0% param coverage, the description omits return format, parameter details, and usage context. It is insufficient for a tool with two parameters.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description adds no meaning to the two parameters (version, maxDepth) despite 0% schema description coverage. Neither the description nor the schema explains their purpose, leaving the agent without understanding how to use them.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool returns hierarchical group structure of the ISM catalog with control counts, distinguishing it from siblings like list_controls which returns control lists.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for exploring hierarchy but does not mention when to use this tool versus siblings like list_controls or get_control, lacking explicit guidance on alternatives or prerequisites.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
list_profilesList ISM OSCAL profilesA
Lists the OSCAL profiles published alongside each ISM release: the five classification baselines (NC, OS, P, S, TS) and the three Essential Eight maturity levels (ML1, ML2, ML3).
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It only states what is listed, but does not disclose any behavioral traits such as whether authentication is required, rate limits, or that this is a read-only operation. The description lacks depth beyond enumeration.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences with no wasteful words. Front-loaded with the key action and resource, followed by specific items. Efficient and to the point.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given no parameters and a simple listing output, the description is largely complete. However, it could mention that the returned profile identifiers are used as input to tools like get_profile_controls, and it omits details about output format (e.g., API response structure). Still, it suffices for basic understanding.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters, so the description does not need to add parameter information. Schema description coverage is 100%, and the baseline for zero-param tools is 4, which is appropriate as the description does not need to compensate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'Lists' and the resource 'OSCAL profiles published alongside each ISM release', with specific enumeration of the five classification baselines and three Essential Eight maturity levels. This distinguishes it from sibling tools like list_controls or list_versions.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides no guidance on when to use this tool versus alternatives (e.g., get_profile_controls). It does not mention prerequisites, typical use cases, or exclusions, leaving the agent to infer usage context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
list_versionsList ISM versionsB
Lists every published ISM release (historical, current, and any future tags as soon as they appear upstream). Returns tag, version id, commit SHA, and release date parsed from the tag.
| Name | Required | Description | Default |
|---|---|---|---|
| refresh | No | Force a refresh of the upstream tag list, bypassing the cache. | |
| limit | No |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must disclose behavioral traits. It states the tool lists and returns data but does not mention performance, caching behavior, rate limits, side effects, or read-only nature beyond what's implied.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences cover purpose and return value without extraneous information. The description is front-loaded and every sentence contributes value.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The description is adequate for a simple list tool, specifying what is returned. However, it lacks details on ordering, pagination, or ISM context. No output schema exists, so more completeness would benefit.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 50% (refresh described, limit not). The description does not add meaning to the parameters; it only outlines return fields. For low coverage, the description should compensate but fails to do so.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'Lists' and the resource 'ISM releases/versions', specifying that it includes historical, current, and future tags. It distinguishes from sibling tools like list_controls by focusing on versions.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for listing all versions but provides no explicit guidance on when to use this tool over alternatives such as get_version_metadata or compare_versions. No exclusions or context are given.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
search_controlsSearch ISM controlsA
Full-text search across ISM control labels, titles, statements, and group paths. Combine with applicability/group/labelPrefix filters.
| Name | Required | Description | Default |
|---|---|---|---|
| query | Yes | ||
| version | No | ||
| applicability | No | Applicability marking: NC=Non-classified, OS=OFFICIAL: Sensitive, P=PROTECTED, S=SECRET, TS=TOP SECRET. | |
| group | No | ||
| labelPrefix | No | ||
| limit | No | ||
| offset | No | ||
| includeStatement | No | Include the control statement in each result. |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, and the description does not disclose behavioral traits such as side effects, authorization needs, or rate limits. It only states the search capability, leaving the agent without awareness of destructive potential (none implied) or other constraints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences, each adding unique value: first defines action and scope, second gives filter combinations. No redundant or wasted words. Front-loaded with key information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With 8 parameters, no output schema, and no annotations, the description is too brief. It omits details about pagination, ordering, default limit, and the structure of results (e.g., list of IDs vs full objects). The agent lacks full context to use the tool effectively.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is only 25% (2 of 8 parameters have descriptions). The description mentions 'applicability/group/labelPrefix filters' but does not explain other parameters like query, version, limit, offset, or includeStatement beyond their names. The description fails to compensate for the low schema coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states 'Full-text search across ISM control labels, titles, statements, and group paths', specifying the verb (search), resource (ISM controls), and scope (multiple fields). This distinguishes it from sibling tools like get_control (specific control) and list_controls (listing without full-text).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description advises combining with applicable filters, giving clear usage context. However, it does not explicitly exclude when not to use (e.g., when exact ID is known), but the context is sufficient for typical use.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
TDQS
Each tool has a clearly distinct purpose: cache_info handles offline cache, compare_versions diffs releases, get_control/get_controls retrieve details, get_profile_controls gets controls for profiles, get_version_metadata gets release metadata, list_controls filters controls, list_groups shows hierarchy, list_profiles lists baselines, list_versions lists releases, and search_controls performs full-text search. No two tools have overlapping functionality.
All tool names follow a consistent verb_noun pattern in snake_case: cache_info, compare_versions, get_control, get_controls, get_profile_controls, get_version_metadata, list_controls, list_groups, list_profiles, list_versions, search_controls. The verbs are descriptive and the nouns clearly indicate the resource.
11 tools is well-scoped for an ISM reference server. It provides sufficient granularity for querying, searching, listing, and comparing controls, profiles, and versions without being excessive or minimal.
The tool set covers all essential operations for exploring the ISM catalog: retrieving individual or multiple controls, listing with filters, full-text search, accessing version metadata, listing versions and profiles, getting profile controls, comparing releases, and checking cache status. No obvious gaps for a read-only reference server.
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