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https://issues.apache.org/jira/browse/CAMEL-25194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18121618#comment-18121618
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Claus Ibsen commented on CAMEL-25194:
-------------------------------------
PR: https://github.com/apache/camel/pull/27219
> The tools cannot author a custom Kamelet: the validator checks a
> .kamelet.yaml against the route schema
> -------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25194
> URL: https://issues.apache.org/jira/browse/CAMEL-25194
> Project: Camel
> Issue Type: Bug
> Components: camel-jbang
> Reporter: Claus Ibsen
> Priority: Major
>
> Writing a custom Kamelet cannot be done through the tools. The validator
> treats every YAML file as a list of route entries, so a {{.kamelet.yaml}},
> which is legitimately a YAML object, is rejected -- and because
> {{camel_write_file}} and {{camel_edit_file}} validate before they write, the
> file cannot be written at all.
> h3. Reproducing it
> This Kamelet runs correctly. {{camel run demo.camel.yaml
> content-filter-action.kamelet.yaml}} logs {{analytics: {"country" : "DK",
> "orders" : 3}}}, the two PII fields stripped:
> {code:yaml}
> apiVersion: camel.apache.org/v1
> kind: Kamelet
> metadata:
> name: content-filter-action
> labels:
> camel.apache.org/kamelet.type: action
> spec:
> definition:
> title: Content Filter
> properties:
> allowlist:
> title: Allowlist
> type: string
> template:
> from:
> uri: kamelet:source
> steps:
> - setBody:
> expression:
> jq:
> expression: 'with_entries(select(.key as $k | "{{allowlist}}"
> | split(",") | index($k)))'
> {code}
> The same file, through each surface:
> {noformat}
> $ camel validate yaml content-filter-action.kamelet.yaml
> Validation error detected (errors:1)
> File: content-filter-action.kamelet.yaml
> : object found, array expected (a Camel YAML file is a list of
> entries, each
> starting with "- ": - route:, - from:, - beans:, - rest:, -
> onException:)
> camel_validate_source -> the same error
> camel_write_file -> {"status":"invalid", ... "The file was not written:
> the
> content has validation errors."}
> {noformat}
> So the loader and the validator disagree about what a {{.kamelet.yaml}} is:
> {{KameletRoutesBuilderLoader}} loads it, {{YamlValidator}} in
> camel-yaml-dsl-validator checks it against {{camelYamlDsl.json}}, the route
> schema, and there is no Kamelet schema in the repo.
> h3. It also misdirects when the error is real
> Before the version above, the {{jq}} step was written as a step of its own,
> which is not a thing. The loader failed at line 20 -- correctly -- but
> {{YamlLoadFailureReport}} printed the "object found, array expected" hint
> again, pointing at the envelope instead of at line 20. Two wrong diagnoses in
> a row, both away from the fault.
> h3. What else is missing for authoring a Kamelet
> * {{camel_catalog_sample}} with {{name=kamelet}} returns the *usage* shape
> ({{to: uri: kamelet:my-aggregate}}), not the shape of a {{.kamelet.yaml}}.
> There is no sample of the envelope, the {{kamelet.type}} label,
> {{spec.definition}} as a JSON-schema fragment, {{from: uri: kamelet:source}},
> or how a {{{{property}}}} of the definition is referenced in the template.
> * {{camel_catalog_docs}} lists no kamelet page, so there is nothing to read
> either.
> * {{camel_catalog_kamelets}} and {{camel_catalog_kamelet_doc}} are
> consumption only: list the catalog, describe one that exists. Nothing covers
> writing one.
> h3. Suggested direction
> # Validate a Kamelet as a Kamelet. Detect it the way the loader does ({{kind:
> Kamelet}}, or the {{.kamelet.yaml}} suffix) and check {{spec.template}}
> against the route schema while the envelope is checked on its own. The split
> already exists in {{KameletRoutesBuilderLoader}}; the validator can follow
> it. Until the envelope is schema-checked, recognising the file and validating
> only the template would already unblock authoring.
> # Fix the hint. A Kamelet author must not be told to start the file with {{-
> }}, in {{camel validate yaml}}, in {{camel_validate_source}} or in
> {{YamlLoadFailureReport}}.
> # Give the authoring shape somewhere to be found: a {{.kamelet.yaml}} sample
> from {{camel_catalog_sample}}, and a page reachable from
> {{camel_catalog_docs}}.
> h3. Why it matters now
> Custom Kamelets are how a policy-level transformation gets written once and
> reused, and the workflow has just been documented for the visual editor
> (https://kaoto.io/blog/2026/custom-kamelets/). The same task over the CLI and
> the camel-jbang-mcp server should work as well: an agent that follows the
> supported path cannot write the file at all today, and would have to go
> around the tools to do it.
> Found while checking how a model would do that task with the CLI and the MCP
> server.
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