MCP servers › io.github.Cratis › chronicle-mcp
MCP server · registry snapshot 2026-10-23 · last tested 2026-10-23
io.github.Cratis/chronicle-mcp
Inspect Cratis Chronicle event stores read-only by default; opt-in, authorized job control. — the publisher's description
Summary
io.github.Cratis/chronicle-mcp is a local MCP server listed in the official MCP registry at version 2.0.0. On 2026-10-23 ProtocolProbe started its published package in an isolated sandbox in read-only mode and read its inventory: 24 tools, 0 resources and 3 prompts.
Record checks
5 of 5 record checks met · 4 do not apply
- met: Registry entry is active and says how to run it
- met: Source repository link opens
- met: Repository is not archived
- met: Code pushed to the repository in the 90 days before our check
- met: Repository publishes a security policy (SECURITY.md)
- not applicable: Package names its licence with a standard (SPDX) identifier
- not applicable: The version the registry lists can be installed and is not withdrawn
- not applicable: npm package carries build provenance (attestation)
- not applicable: No known critical or high advisory in the package or its dependencies
- Not ranked by downloads: not an npm or PyPI package
- Not ranked by stars: 0 stars (ranked from 10)
From public records, not a safety rating. Each check with its reason · Is it safe to install?
Key facts
- Runs
- local package
- Transport
- standard input/output
- Package
- Docker (OCI)
- Repository
- public
- Tools
- 24
- Described as changing data
- 1 of 24 toolsAI-classified
- Topic
- data-and-databasesAI-classified
- Last tested
- 2026-10-23
Worth knowing before you connect it
- 1 tool is described as changing something (scaffold_read_model): our AI model's reading of the descriptions, not something we tested. We did not call it.
Each line comes from a section below, with its source and date.
How fresh this is
- Live-tested
- yes, a real session (not a text-only review)
- Last tested
- 2026-10-23
- Mode
- read-only (no tool calls)
- Latest version
- 2.0.0, published 2026-10-09 (registry, as of the 2026-10-23 snapshot)
- First listed version
- 2026-10-09 (earliest version still in the registry; older removed versions would be earlier)
- Registry data
- snapshot 2026-10-23
- Package and repository
- checked 2026-10-23
- Engine
- mcp-runtime-engine@0.1.0 · sdk@1.32.0
Changes since the last refresh
New in the registry: not in the list of 2026-10-04, listed on 2026-10-23 with version 2.0.0 (published 2026-10-09).
Source: the official MCP Registry list on 2026-10-04 and on 2026-10-23.
What it is
What does this server offer?
Observed inventory1 of 24 tools are described as changing something (creating, editing, deleting, sending or running).
- get_read_model_instancesreads or searches
“Lists the current instances of a read model as JSON, with pagination.”
Publisher declares: read-only yes · open-world no
5 inputs, 1 required
readModelstringrequired“The read model container name to list instances for.”eventStorestring or null“The event store.”namespacestring or null“The namespace.”pageinteger“The 0-based page number.”pageSizeinteger“The number of items per page.”
- explain_causal_tracereads or searches
“Reads the ordered event history for one event source together with each event's correlation id and causation chain, so an agent can narrate what happened and why instead of a support engineer reading…”
Publisher declares: read-only yes · open-world no
5 inputs, 1 required
eventSourceIdstringrequired“The event source id to trace (e.g.”eventSequenceIdstring“The event sequence to read from.”eventTypestring or null“An optional comma-separated event type filter.”eventStorestring or null“The event store.”namespacestring or null“The namespace.”
- audit_unconsumed_event_typesreads or searches
“Cross-references every registered event type against all projections, reducers, and reactors, and reports the event types that nothing consumes (data being written that no read model or reactor reads…”
Publisher declares: read-only yes · open-world no
2 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace to resolve observers in.”
“Deduces what the system in an event store is and is for.”
Publisher declares: read-only yes · open-world no
2 inputs
eventStorestring or null“The event store to describe.”namespacestring or null“The namespace to resolve observers in.”
- run_ad_hoc_projectionreads or searches
“Answers ad-hoc queries by projecting events on demand: reads the given event types from the store and folds them into per-event-source instances with AutoMap semantics (later events overwrite earlier…”
Publisher declares: read-only yes · open-world no
7 inputs, 1 required
eventTypesstringrequired“Comma-separated event type ids to fold (e.g.”removedWithstring or null“Optional comma-separated event type ids that remove an instance (e.g.”eventStorestring or null“The event store.”namespacestring or null“The namespace.”eventSequenceIdstring“The event sequence to read from.”eventSourceIdstring or null“An optional event source id to scope to a single instance.”limitinteger“The maximum number of instances to return.”
- suggest_next_event_typesreads or searches
“Suggests event types to introduce next for the system in an event store.”
Publisher declares: read-only yes · open-world no
2 inputs
eventStorestring or null“The event store to analyze.”entitystring or null“An optional entity name to scope the suggestions to (case-insensitive).”
- list_projectionsreads or searches
“Lists all projection definitions registered in an event store, including the read model they project into and their activity state.”
Publisher declares: read-only yes · open-world no
1 input
eventStorestring or null“The event store.”
“Lists all namespaces within an event store.”
Publisher declares: read-only yes · open-world no
1 input
eventStorestring or null“The event store to list namespaces for.”
“Gets a specific job by ID.”
Publisher declares: read-only yes · open-world no
3 inputs, 1 required
jobIdstringrequired“The job identifier.”eventStorestring or null“The event store.”namespacestring or null“The namespace.”
- list_observersreads or searches
“Lists observers (projections, reactors, reducers, client observers) in a namespace, with health and replay status.”
Publisher declares: read-only yes · open-world no
3 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace.”typestring“Observer type filter: reactor, reducer, projection, or all (default).”
- describe_event_typereads or searches
“Describes a registered event type's real schema — every property with its JSON type and a suggested C# type — read from the store's event type registry.”
Publisher declares: read-only yes · open-world no
3 inputs, 1 required
eventTypestringrequired“The event type id/name to describe (e.g.”generationinteger or null“The optional specific generation to describe.”eventStorestring or null“The event store.”
- generate_event_catalogreads or searches
“Produces a living data dictionary from the event store: every event type with its fields (from the registered schema) and every projection, reducer, and reactor that consumes it.”
Publisher declares: read-only yes · open-world no
3 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace to resolve observers in.”eventTypestring or null“An optional single event type id to scope the catalog to.”
Show 12 more tools
- get_observerreads or searches
“Shows detailed information about a specific observer including its type, running state, owner, handled sequence numbers and observed event types.”
Publisher declares: read-only yes · open-world no
4 inputs, 1 required
observerIdstringrequired“The identifier of the observer to show.”eventStorestring or null“The event store.”namespacestring or null“The namespace.”eventSequenceIdstring“The event sequence to inspect.”
- get_tail_sequence_numberreads or searches
“Returns the highest used sequence number (tail) in an event sequence.”
Publisher declares: read-only yes · open-world no
5 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace.”eventSequenceIdstring“The event sequence to inspect.”eventTypestring or null“An optional comma-separated event type filter.”eventSourceIdstring or null“An optional event source id to filter by.”
“Gets version information from the connected Chronicle server.”
Publisher declares: read-only yes · open-world no
Takes no inputs.
- scaffold_read_modelcreates or changes datadescribed as changing data
“Generates a reviewable read model + model-bound projection from one or more event types, grounded in the events' real schema (field names and types come from the store, never guesses).”
Publisher declares: read-only yes · open-world no
4 inputs, 2 required
readModelNamestringrequired“The name of the read model to generate (e.g.”eventTypesstringrequired“A comma-separated list of event type ids to project from (e.g.”codeNamespacestring“The C# namespace to generate the read model into.”eventStorestring or null“The event store.”
“Lists all registered event types in an event store, including their id, generation, owner and source.”
Publisher declares: read-only yes · open-world no
1 input
eventStorestring or null“The event store to get event types from.”
- list_event_storesreads or searches
“Lists all event stores registered on the Chronicle server.”
Publisher declares: read-only yes · open-world no
Takes no inputs.
“Retrieves events from an event sequence with optional filtering by sequence range, event source id, and event type.”
Publisher declares: read-only yes · open-world no
7 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace.”eventSequenceIdstring“The event sequence to read from.”frominteger“The starting event sequence number.”tointeger or null“The optional ending event sequence number.”eventSourceIdstring or null“An optional event source id to filter by.”eventTypestring or null“An optional comma-separated event type filter (e.g.”
- list_failed_partitionsreads or searches
“Lists observer partitions that have failed and are paused, including the failure reason and the sequence number where the failure occurred.”
Publisher declares: read-only yes · open-world no
3 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace.”observerIdstring or null“Optional observer identifier to filter by.”
“Lists active recommendations from the Chronicle server.”
Publisher declares: read-only yes · open-world no
2 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace.”
“Lists all jobs in a namespace, optionally filtered by status.”
Publisher declares: read-only yes · open-world no
3 inputs
eventStorestring or null“The event store.”namespacestring or null“The namespace.”statusstring or null“Optional filter by job status.”
- get_job_stepsreads or searches
“Gets the job steps for a specific job.”
Publisher declares: read-only yes · open-world no
4 inputs, 1 required
jobIdstringrequired“The job identifier.”eventStorestring or null“The event store.”namespacestring or null“The namespace.”statusstring or null“Optional filter by job step status.”
- list_read_modelsreads or searches
“Lists all read model definitions registered in an event store.”
Publisher declares: read-only yes · open-world no
1 input
eventStorestring or null“The event store.”
Each quoted sentence is the first sentence of the publisher’s own description. The kind of tool and the “changes data” mark are our AI model’s reading of that description, not something we tested: two differently worded runs had to agree, otherwise no label is shown, and nobody has checked them by hand. A tool without the “changes data” mark is described as only reading, searching or calculating, or the two runs did not agree. No tool was called. Read the publisher’s full description before relying on it. “Publisher declares” lists the hints the server itself sends with the tool (MCP annotations: read-only, destructive, idempotent, open-world); they are the publisher's claims, not checked by us. Inputs are the parameters in the tool's own input schema: name, declared type, whether it is required, and the first sentence of its description. Read 2026-10-23.
How well are its tools described?
Features #4 and #5
How clearly this server's own tool descriptions say what a tool does, and how consistent its tool list is. The first part is an AI model's yes/no reading of each description; the second part is counted. We do not turn it into a grade.
Descriptions
AI reading of each description
- Says what the tool does
- 100% of 24 tools
- Says what it returns
- 100% of 24 tools
- States limits, defaults or errors
- 100% of 7 tools
- Says when to use it
- 100% of 16 tools
- Items covered per tool
- 4.0 of 4 on average
Counted from the listing
- Parameters with a description
- 100% of 71
- Tools with a description
- 100% of 24
- Typical description length
- 239 characters
The tool set
Counted from the listing
- Tools
- 24
- Size of the list
- about 4,652 tokens for an agent to load (characters ÷ 4)
- Naming
- 24 of 24 names use snake_case
AI reading: easy to mix up
No pair found.
The AI items cover 24 of 24 tools: for a tool where two differently worded runs disagreed, that item is left out. They were not checked by hand, and no tool was called. “Easy to mix up” means two tools whose names or descriptions overlap without saying how they differ; the AI found none. We do not rate whether the tool set is complete or whether side effects are spelled out, because our AI reading of those was not reliable enough.
How do I add it to my client?
Config from the registry entry
- No config: the Docker image declares runtime arguments (options for the runner itself), and the registry documentation gives no rule for where they go.
Built from the server's registry entry with each client's documented format (checked 2026-10-14; the Cursor link and the VS Code command 2026-10-19; the MCP Inspector command 2026-10-21). Values in < > are yours to fill in; this page never contains a key. Where the server needs a setting the entry does not declare, it can still fail to start.
Does the registry listing match what we found?
Feature #6The registry verifies a package once, when it is published, and does not re-check it. A difference below is about the listing, not a judgement of the publisher.
| Registry says | We found | Result | Source · date |
|---|---|---|---|
| Published package can be started | Started and answered | matches | our test · 2026-10-23 |
| Repository github.com/Cratis/Chronicle.Mcp | Opens publicly | matches | api.github.com · 2026-10-23 |
Who made it?
Feature #7 · lineage
Facts about the publisher. We do not turn them into a trust score.
- Namespace
- io.github.Cratis
- GitHub owner
- an organization (Cratis)
- Repository
- github.com/Cratis/Chronicle.Mcp
- Stars
- 0
- Repository age
- over a year
- Last push
- 0–30 days ago
- Archived
- no
- Security policy
- owner's .github/SECURITY.md
Source: the registry entry and api.github.com · 2026-10-23; security policy read from GitHub · 2026-10-23.
Publish this server? Run these checks against it yourself before release, from your own machine: a server the command starts, or your own server at its URL after a one-time proof that you control it: npx protocolprobe-selftest.
Choosing
Record checks
Public records · not a safety rating5 of 5 record checks met · 4 do not apply
- Not ranked by downloads: not an npm or PyPI package
- Not ranked by stars: 0 stars (ranked from 10)
- MetRegistry entry is active and says how to run itActive, with a package or a remote address.
- MetSource repository link opensThe linked GitHub repository is public.
- MetRepository is not archivedNot archived.
- MetCode pushed to the repository in the 90 days before our checkLast push 0-30 days before our check.
- MetRepository publishes a security policy (SECURITY.md)SECURITY.md found.
- Does not applyPackage names its licence with a standard (SPDX) identifierNot an npm or PyPI package.
- Does not applyThe version the registry lists can be installed and is not withdrawnNot an npm or PyPI package.
- Does not applynpm package carries build provenance (attestation)PyPI packages have no npm-style attestation.
- Does not applyNo known critical or high advisory in the package or its dependenciesNot an npm or PyPI package.
Read from public records only: the registry entry, npm/PyPI, GitHub and advisory databases, checked 2026-10-23. No tool was called. Only “met” and “not met” are counted, so the total differs between servers; a check that does not apply or that we could not run is listed, never counted against it. It is not a safety rating. How each check works · Leaderboards
Common questions about io.github.Cratis/chronicle-mcp
Answered from the data aboveIs io.github.Cratis/chronicle-mcp safe to install?
We do not rate servers as safe or unsafe. 5 of its 5 applicable record checks are met (facts from public records, each listed on this page). What the records show: Its source repository opens publicly. Its repository had a push in the last 90 days. 1 of its tools describes changing data (our AI model's reading of the descriptions). These are facts with their sources on this page, not a safety guarantee, and we did not run its tools.
Has io.github.Cratis/chronicle-mcp been security tested?
Partly. 4 of the 13 checks that apply to it were exercised. We started the package in an isolated sandbox and read what it declares, but this test round was read-only, so its tools were not called. No security verdict is published before verification.
What can io.github.Cratis/chronicle-mcp do?
It lists 24 tools. In our AI model's reading of their descriptions (two runs had to agree, nobody checked it by hand), they include tools that read or search and create or change data. We did not call any tool, so this describes the text, not the behaviour.
Can io.github.Cratis/chronicle-mcp change or delete data?
1 of its tools says in its description that it creates, edits, deletes, sends or runs something (our AI model's reading). We did not call any tool, so we cannot say what actually happens.
Does io.github.Cratis/chronicle-mcp publish a security policy?
Yes: its repository has a public security policy (github.com/cratis/.github/blob/HEAD/SECURITY.md). That is the publisher's statement, not permission for us to test the server, and we call none of its tools.
Where is the source code of io.github.Cratis/chronicle-mcp?
In github.com/Cratis/Chronicle.Mcp, which opens publicly.
Found this page useful?
Anonymous · no sign-inA quick, anonymous reaction — no account, no email. One per kind from your browser. The tally updates when the page is next refreshed, and it is only a rough count, never a safety rating or a measured number of people.
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Active servers whose topic is also “data-and-databases” and that have at least one tool of the same kind; most kinds in common first, then most GitHub stars. The topic and the tool kinds are an AI model's reading of the publishers' descriptions, not checked by hand. Similar is not a recommendation.
Compare with another server
Side by side: registry entry, our read-only session, the tools and the 18 classification fields. Same values as each page; no score.
Security testing
What did we test, and what did we leave out?
18 checks · features #1, #2
Not probed (read-only run)
We started the package in an isolated sandbox and read what it declares, but this test round was read-only, so its tools were not called. No security score is given; a check we did not run is never counted as passed.
- Inventory: exercised
- Hidden instructions: exercised
- Real execution: not run · our policy
- Secret leak: not run · nothing to check it against
- Internal addresses: not run · our policy
- Unconfirmed changes: not run · our policy
- Bad input: not run · our policy
- Model requests: not run · nothing to check it against
- Sensitive questions: not run · nothing to check it against
- Folder boundary: not run · our policy
- Log leaks: not run · nothing to check it against
- Hidden content: exercised
- Fake assistant turns: exercised
- Token passthrough: not applicable
- Token audience: not applicable
- Sign-in redirect: not applicable
- Consent handling: not applicable
- Sign-in metadata: not applicable
4 exercised9 not run (reason given)5 not applicable
Each check ends in exactly one state: exercised, not run (with the reason), or not applicable (with the reason). 4 of the 13 checks that apply to it were exercised. We do not publish security-check outcomes for named servers.
- 1Inventory
tool-listReads the declared tools, resources and prompts.exercised - 2Hidden instructions
description-poisoningLooks for hidden instructions in tool descriptions.exercised - 12Hidden content
audience-hidingChecks resources that hide content from the user.exercised - 13Fake assistant turns
fake-assistant-turnChecks prompts that pose as the assistant's own words.exercised
- 3Real execution
real-executionCalls a tool and checks what really happens.This check calls the package's tools. This test round was read-only, so no tool was called; tools can act on outside services with the publisher's or a user's account.not run · our policy - 4Secret leak
canary-leakPlants a fake secret and checks whether it leaks.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 5Internal addresses
ssrfChecks whether a tool can be steered to internal addresses.This check calls the package's tools. This test round was read-only, so no tool was called; tools can act on outside services with the publisher's or a user's account.not run · our policy - 6Unconfirmed changes
write-without-confirmationChecks whether tools that change data act without asking.This check calls the package's tools. This test round was read-only, so no tool was called; tools can act on outside services with the publisher's or a user's account.not run · our policy - 7Bad input
error-handlingSends bad input and watches how the server answers.This check calls the package's tools. This test round was read-only, so no tool was called; tools can act on outside services with the publisher's or a user's account.not run · our policy - 8Model requests
samplingChecks whether the server asks the client's model to act for it.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 9Sensitive questions
elicitation-sensitive-dataChecks whether the server asks users for sensitive data.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against - 10Folder boundary
root-boundaryChecks whether the server reaches outside the folders it was given.This check calls the package's tools. This test round was read-only, so no tool was called; tools can act on outside services with the publisher's or a user's account.not run · our policy - 11Log leaks
logging-side-channelChecks whether log messages carry data they should not.This check needs at least one successful tool call to have something to check, and no tool was called.not run · nothing to check it against
- 14Token passthrough
token-passthroughChecks whether the server forwards a user's token to other services.The server runs locally over standard input/output, so there is no sign-in flow to check.not applicable - 15Token audience
token-audience-validationChecks whether tokens meant for another service are accepted.The server runs locally over standard input/output, so there is no sign-in flow to check.not applicable - 16Sign-in redirect
open-redirectChecks the sign-in redirect for abuse.The server runs locally over standard input/output, so there is no sign-in flow to check.not applicable - 17Consent handling
confused-deputyChecks consent handling when one service acts for another.The server runs locally over standard input/output, so there is no sign-in flow to check.not applicable - 18Sign-in metadata
oauth-url-schemeChecks the published sign-in metadata for unsafe URLs.The server runs locally over standard input/output, so there is no sign-in flow to check.not applicable
Source: our own test in an isolated sandbox, 2026-10-23, mcp-runtime-engine@0.1.0. Which checks count and why follows our published scoring model.
What happened during the test?
Feature #8
The steps in order, as the test record holds them.
- 0 msStarted the published package in an isolated sandbox (read-only mode)
- 1,800 msConnected after 0 redirects.
- Read the inventory: 24 tools, 0 resources, 3 prompts.
- 12,384 msFinished: 4 checks exercised.
Reference
How is it classified?
18 fields
One value per field, each with its source. Fields written by AI models are marked. A field with no value says why.
“Not stated” means the source did not state it; “does not apply” means it does not apply to this kind of server; “our limit” means our own lookup failed. A linked value opens the directory filtered to the same value.
Cite or correct this page
Sources and corrections
Suggested citation
ProtocolProbe. “io.github.Cratis/chronicle-mcp: MCP server record.” Data checked 2026-10-23. https://protocolprobe.com/mcp/servers/io.github.Cratis/chronicle-mcp
Figures are valid for the date shown. Our facts on this page are CC BY 4.0: reuse them with a link and the check date. Quoted text (the publisher’s descriptions, website quotes, tool names) is not ours to license.
As JSON: this record in the API · API documentation.
Badge for your README
[](https://protocolprobe.com/mcp/servers/io.github.Cratis/chronicle-mcp)
It shows this server's record-check count: facts from public records, no tool called. It is not a security rating or a pass. It links here and updates after each data reload.
Something wrong, or is this yours?
If a fact here is wrong, tell us and we will re-check it. If you operate this server, you can run our checks on it yourself with the free self-test command; we call no server’s tools ourselves for anything shown here.
Write to hello@protocolprobe.com · corrections log · methodology