Features — CodeSampleX

Find and inspect evidence

Search for a verified answer, fetch its files, or inspect compatibility evidence for one public software target and symbol.

search_known_solution Find a verified solution graded against the environment you describe.

What it does

Searches the local CodeSampleX network cache. A hit reports its match grade, environment differences, adaptations, evidence counts, and the contract assertions that actually passed. A miss is returned as NO_SAFE_MATCH, never guessed into a hit.

When to use it

Call before using a public library, SDK, runtime, OS command or standalone CLI, or when its error may already have a verified detour.

Inputs

Required

query string: What you are trying to do or fix, in plain words.

Optional

packages string[]: Public target coordinates: pkg:npm/axios@1.12.0 for a registry package or pkg:generic/cli/npm@11.5.2 for the npm CLI itself.
symbols string[]: Public symbol families, for example axios.post.
environment object: Sparse environment fingerprint; known values may include ecosystem, OS, architecture, runtime, language, compiler, package manager, module system, frameworks, execution context, browser/engine, libc, virtualization, and container runtime.
errorText string: Raw error text to sanitize locally into an error code and fingerprint.

JSON input example

{
  "query": "send JSON and retry a reset connection",
  "packages": ["pkg:npm/axios@1.12.0"],
  "symbols": ["axios.post"],
  "environment": {"os":"linux","runtime":"node","runtimeVersion":"22.18","executionContext":"node"}
}

Output shape and example

MCP content text plus structuredContent containing the search response and a local offerId on an eligible hit. A miss can also include packageOverview and localReady.

{
  "structuredContent": {
    "schemaVersion": 2,
    "results": [{"grade":"EXACT","sampleId":"sha256:..."}],
    "offerId": "local-offer-id"
  }
}

get_sample Fetch the manifest and readable files for one cached public sample.

What it does

Returns the sample manifest and cached text files. Each file is capped at 64 KB and binary files are skipped. Public samples are MIT-0 community artifacts.

When to use it

Use after search_known_solution returns a sampleId and you need the complete runnable example.

Inputs

Required

sampleId string: Content-addressed sample id in sha256:... form.

Optional

No fields.

JSON input example

{"sampleId":"sha256:0123456789abcdef..."}

Output shape and example

MCP content text plus structuredContent with sampleId, manifest, and a path-to-content files object.

{
  "structuredContent": {
    "sampleId": "sha256:...",
    "manifest": {"license":"MIT-0","packages":["pkg:npm/axios@1.12.0"]},
    "files": {"src/index.mjs":"..."}
  }
}

explain_compatibility Explain cached compatibility evidence for a package and optional symbol.

What it does

Reads local compatibility shards and keeps project observations separate from contract verification evidence instead of adding unlike evidence together.

When to use it

Use when you need the per-symbol evidence behind a result or want to compare one package with a target environment.

Inputs

Required

package string: Package purl, for example pkg:npm/axios@1.12.0.

Optional

symbol string: Public symbol family, for example axios.post.
environment object: The same sparse environment fingerprint accepted by search_known_solution.

JSON input example

{
  "package": "pkg:npm/axios@1.12.0",
  "symbol": "axios.post",
  "environment": {"runtime":"node","runtimeVersion":"22.18"}
}

Output shape and example

MCP content text plus structuredContent with package, symbol, and the underlying compatibility snapshot (or null).

{
  "structuredContent": {
    "package": "pkg:npm/axios@1.12.0",
    "symbol": "axios.post",
    "snapshot": {"schemaVersion":1,"rows":[]}
  }
}

Run with observation

Execute a normal build or test while recording a sanitized public-package outcome.

run_observed_command Run an argv command through the evidence loop and return its real exit code.

What it does

Scans public dependencies, runs the command locally, classifies its stage and result, and returns only sanitized error templates alongside the original exit code.

When to use it

Use for builds and tests after adopting or creating package-dependent code, instead of running the command outside CodeSampleX.

Inputs

Required

command string[]: Command argv, for example ["npm","test"].

Optional

cwd string: Working directory; defaults to the current directory.

JSON input example

{"command":["npm","test"],"cwd":"project"}

Output shape and example

MCP content text plus structuredContent with exitCode, stage, result, sanitizedErrors, and evidenceClass.

{
  "structuredContent": {
    "exitCode": 0,
    "stage": "PROJECT_TEST",
    "result": "PASS",
    "sanitizedErrors": [],
    "evidenceClass": "USAGE_OBSERVATION"
  }
}

Close the evidence loop

Report whether an offered answer worked, or prepare a clean-room sample proposal after a miss.

report_sample_adoption Record whether a search result was applied and whether the next build passed.

What it does

Correlates the report with the local offer returned by search_known_solution and records ADOPTION_EVIDENCE. A failure is counted as avoided only when the full local correlation proves it.

When to use it

Call after deciding whether to use an offered sample, once the post-adoption build result is known or explicitly unknown.

Inputs

Required

offerId string: Opaque local offer id returned by search_known_solution.
sampleId string: The offered sha256 content address.
applied boolean: Whether the sample approach was applied.

Optional

buildPass boolean: Whether the project built or passed after adoption; omit when unknown.

JSON input example

{"offerId":"local-offer-id","sampleId":"sha256:...","applied":true,"buildPass":true}

Output shape and example

MCP content text plus structuredContent with recorded, uploadQueued, sampleId, applied, reportedFailureAvoided, evidenceClass, and buildPass when supplied.

{
  "structuredContent": {
    "recorded": true,
    "uploadQueued": true,
    "sampleId": "sha256:...",
    "applied": true,
    "buildPass": true,
    "reportedFailureAvoided": false,
    "evidenceClass": "ADOPTION_EVIDENCE"
  }
}

propose_public_sample Create a sanitized clean-room brief and an empty local workspace.

What it does

Builds a proposal from a goal, public package purls, and public symbols, then returns generation instructions and the exact empty workspace path. This tool cannot publish.

When to use it

Use after NO_SAFE_MATCH when you solved the boundary and the observed build or contract passed.

Inputs

Required

goal string: The behavior the sample should prove.
packages string[]: Public package purls the sample must use.

Optional

symbols string[]: Public symbol families the sample should demonstrate.

JSON input example

{"goal":"axios upload progress","packages":["pkg:npm/axios@1.12.0"],"symbols":["axios.post"]}

Output shape and example

MCP content text plus structuredContent with spec, prompt, workdir, and publishRequiresUserApproval.

{
  "structuredContent": {
    "spec": {"goal":"axios upload progress","packages":["pkg:npm/axios@1.12.0"]},
    "prompt": "Generate the sample...",
    "workdir": "<local clean-room path>",
    "publishRequiresUserApproval": true
  }
}

Inspect this installation

Read recent local search outcomes or the local dashboard counters without uploading anything.

list_local_hits List recent search hits, grades, and adoption outcomes stored locally.

What it does

Returns recent hit rows with timestamp, query, grade, sample id, adopted state, and post-build result when it was reported.

When to use it

Use to audit which answers this installation received and whether they were later adopted.

Inputs

Required

No fields.

Optional

No fields.

JSON input example

{}

Output shape and example

MCP content text plus structuredContent with a hits array. postBuildPass is omitted when unknown.

{
  "structuredContent": {
    "hits": [{"ts":"2026-08-13T10:00:00Z","query":"axios post","grade":"COMPATIBLE","sampleId":"sha256:...","adopted":true,"postBuildPass":true}]
  }
}

get_local_stats Read mode, cache, queue, hit, and adoption counters for this installation.

What it does

Returns the current local stats object. Common keys include mode, hits, cachedSamples, queuedUploads, pendingObservations, and the verified-detour outcome counters; the available set can grow.

When to use it

Use to check initialization, cache readiness, pending community work, or whether the evidence loop is being used repeatedly.

Inputs

Required

No fields.

Optional

No fields.

JSON input example

{}

Output shape and example

MCP content text plus the local stats map directly as structuredContent.

{
  "structuredContent": {
    "mode": "community",
    "hits": 7,
    "cachedSamples": 31,
    "queuedUploads": 0,
    "pendingObservations": 0
  }
}