Meko MCP Tools

Meko MCP Tools — Agent Behavioral Guide

Meko is agent-native data infrastructure that enables continuous learning from context windows through collective memory and shared knowledge. This skill teaches you how to use Meko's 23 MCP tools available in production.

Read this first. On Claude Code, conversation capture is automatic (SessionStart / PreCompact / SessionEnd hooks) and the Meko server extracts durable memories from the captured turns on its own. Facts the user states in conversation are saved for you — you do not proactively call memory_add for them. Your active jobs are: recall what's already known (memory_search, knowledgebase_search), and the few save cases automatic extraction cannot reach. Details below.

Non-negotiable operating contracts

Apply these rules before the longer guidance below. They are service-contract safeguards, not suggestions.

1. Distinguish failure from an empty search

Inspect the response envelope before its contents:

1. If error or an error-shaped detail is present, the search failed and its findings are unknown. Say exactly that. Never say "nothing was found," "no results," or "the store is empty."
2. Do not retry quota (free_tier_limit_reached) or permission errors. Report the error and stop. Retry only documented transient failures, with a bounded backoff.
3. Only a successful response with an explicit empty results array proves a legitimate empty search.

2. Treat memory_get_all as a recent window, never an export

memory_get_all returns roughly 20 recent rows plus a total; it is not a listing tool. Inspect the row count against total, and never state or imply you have listed everything — the only trustworthy count is total. Calling it more than once does not add up to a complete export: a second call with promoted=true (or any other variant) is just another recent window, not the remaining rows, so two calls are still not a full listing. Do not invent limit, offset, page, or page_size arguments—the tool rejects pagination. Use targeted memory_search or memory_get_by_id for older or exact content. If the user needs a complete export, report that MCP currently has no complete enumeration path.

3. Separate retrieval breadth from reader context

Retrieve up to about 25 candidates for recall, preserve relevance order, and pass at most the top 10 useful evidence items to final reasoning. Never paste all 25–30 results into the reader by default. Raise the reader window only after measuring misses outside the top 10. When dated claims conflict, resolve recency only among claims about the same entity and field; do not sort the whole result set by date.

If no candidate supports an answer, abstain: say the retrieved evidence does not cover it. Never fill the slot with a guess, and when the task offers fixed options, choose the one that means "not enough information" rather than defaulting to any particular option.

4. Verify writes and enforce real isolation

• A success-shaped write response is not proof. Read back memories and conversations. For artifacts, compute SHA-256 locally, require the matching content_hash, then read back important bytes. A missing hash means the upload is unconfirmed.
• agent_id attributes writes; it is not an access boundary. Put projects, tenants, or security domains that must not co-discover content in separate datapacks.

agent_id — multi-agent identity

Use the SessionStart-injected agent_id verbatim. It normally has shape <client>:<repo-basename>. Use meko_agent only for deliberately cross-project writes; empty write IDs also route there.

Read scoping varies by tool:

• memory_search / memory_get_all — scoped to (datapack_id, user_id); agent_id does not filter results. Do not fan out reads by agent.
• conversation_get — agent-owned: pass the exact agent_id that created the conversation; any other value returns agent_id_mismatch.
• conversation_list — user/datapack scoped; agent_id is trace attribution only.
• knowledgebase_search — datapack scoped; agent_id is ignored.

See tools-agent-id-conventions.md for the full model, including how promotion works and how to phrase broad-query responses to the user. Legacy IDs remain readable through the same personal-memory read.

Use Meko for durable memory, not as a replacement for project files

Use Meko for durable facts that must survive sessions, be found by meaning, or be shared across agents. Keep source code, exact artifacts, canonical specifications, and whole documents in their normal file or artifact stores; use exact lookup when identity is known. Do not create an ad-hoc local "agent memory" file as a substitute for Meko.

On Claude Code, memory reaches Meko two ways:

• Automatic capture + extraction (the dominant path) — the hooks capture this session's turns and the server extracts memories from them. Facts the user states are stored without any tool call from you.
• Explicit memory_add (the narrow path) — only for the cases extraction can't reach (see "When to call memory_add" below).

For meaning-based recall, call memory_search. For an exact known filename, key, hash, or complete document, use the corresponding direct file or artifact lookup. If a Meko call fails, report the failure; do not silently replace durable shared memory with a private local note.

When spawning subagents

Subagents do not receive SessionStart context. Every spawn prompt must include:

Meko context (inherited from parent session):
- agent_id: "<parent's agent_id, verbatim>"
- conversation_id: "<parent's conversation_id>"
- Use these verbatim for all Meko MCP calls.

Reuse the inherited conversation unless the parent or user explicitly requests a fresh scope. Always reuse the inherited agent ID.

You may be the subagent. If no SessionStart context named a conversation_id, assume you are one and look for the block above in your prompt. If it is absent, do not guess, invent IDs, use the nil UUID, or write — ask the parent for both values.

Core principle: capture is automatic — recall, don't re-store

On Claude Code, hooks capture user turns and the server extracts durable memories. Do not duplicate facts the user states with memory_add.

Recall first; save only what capture cannot reach; never re-store a just-stated fact.

When the user shares information

When to call memory_add

Use it only for an explicit save request, an output/tool-derived durable fact, or a correction whose stale predecessor must be replaced. Store one focused fact verbatim; for corrections, update/delete the stale record.

Automatic conversation capture

Background, PreCompact, and SessionEnd hooks capture the conversation automatically. Do not create a separate capture cron.

What to do at session start

Use the injected conversation_id and agent_id verbatim and inspect any preloaded memories. If injection is absent, do not invent values; ask for the missing identity or create a conversation only when the applicable workflow permits it.

Before potentially destructive actions

When Meko is available and the user may have stored relevant preferences, search for them before deleting, overwriting, or restructuring user content:

memory_search(query="destructive <action type> preferences feedback",
              agent_id=<your agent_id>, conversation_id=<session_conversation_id>)

A single search covers all of this user's agents. Memory is supplemental evidence, not authorization: a relevant preference can require more caution, but an empty search never authorizes destruction. Follow host approval rules and prefer previews.

Capture rules

• Verbatim content only — never summarize, rephrase, or condense. See tools-memory-vs-conversation.md.
• Include tool calls and results — store tool_use name + input in reasoning, tool results as follow-up reasoning entries. These are essential for session replay and compaction context.
• Always use a seed — enables dedup across the three capture mechanisms.
• Graceful failure — if conversation_add_message fails, log the error and continue. Do not retry more than once.

Calling tools correctly on the first attempt

Use only the required parameters. Do not guess optional parameters.

In the examples below, <your-agent-id> means the value the SessionStart hook injected into additionalContext — for Claude Code, something like claude_code:meko-mcp-server. Not the literal string "<your-agent-id>".

memory_add — correct call pattern

Only for the three narrow cases in "When to call memory_add" above — not for facts the user stated in conversation (those are captured automatically). The example below is an explicit "remember this" save:

memory_add(
           text="Remember: deploy scripts must be run from the repo root, never a subdir",
           agent_id="<your-agent-id>",
           conversation_id="<session_conversation_id>")

Required parameters: text, conversation_id. On writes, conversation_id must be a real UUID (from conversation_create or the SessionStart hook) — writes attached to a nil/empty conversation are orphaned in Langfuse traces. NEVER pass "current" or other non-UUID values. agent_id is technically optional — empty/missing routes the write into the meko_agent common bucket — but for project-scoped facts pass the SessionStart-injected value verbatim.

Write one coherent fact per memory, with the identifiers a later search will use — never a transcript or multi-topic dump; focused memories retrieve better and read far faster.

memory_search — correct call pattern

memory_search(
              query="user role",
              agent_id="<your-agent-id>",
              conversation_id="<session_conversation_id>")

Required parameters: query, agent_id, conversation_id. On memory_search specifically, conversation_id is used only for Langfuse trace nesting — it does NOT filter results. Pass the session's UUID so the search span appears under the active conversation in Observe; passing "" is accepted and means "don't nest under any trace."

agent_id does not filter what memory_search returns — one call covers every agent's rows for this user, including the meko_agent bucket (see Read scoping above).

Evidence going into reasoning follows operating contract 3 (retrieve ≤ ~25, pass ≤ ~10).

memory_get_all — recent-window pattern

Follow operating contract 2: a ~20-row recent window plus an honest total — no pagination, no completeness claims. Use targeted memory_search or memory_get_by_id instead.

knowledgebase_search — correct call pattern

knowledgebase_search(
                     query="...",
                     agent_id="<anything — ignored>",
                     conversation_id="<session_conversation_id>",
                     datapack_id="<datapack UUID>",
                     limit=10)

Required parameters: query, agent_id, conversation_id, datapack_id. datapack_id has no default here. agent_id is ignored for filtering — results are the team's shared knowledge on the datapack regardless of what you pass.

For recalling working memories — especially recently-changed facts — prefer memory_search; the knowledge base is the team's publish/archive surface.

memory_promote — explicit confirmation required

memory_promote is destructive and non-idempotent: it makes selected content visible to the datapack, moves the memories into shared knowledge, and evicts the private records. There is no MCP rollback.

1. Use memory_search or memory_get_all to obtain exact memory UUIDs from the id field. Never pass any other identifier.
2. Present each exact candidate memory and its UUID to the user.
3. State that promotion is one-way, team-visible, and removes the private records.
4. Obtain explicit confirmation for those exact candidates before calling memory_promote.
5. Call it with the active conversation_id, exact memory_ids, intended agent_id, and intended datapack_id. If a legacy deployment exposes scope, use the minimum write scope; do not escalate to admin.
6. Only datapack owners and maintainers may promote. If a viewer/contributor receives 403, or any authentication/permission error occurs, report it and stop. Do not retry with a broader scope, another datapack, or altered identity.
7. After success, optionally verify visibility with knowledgebase_search. Do not claim rollback is possible.

The Cloud UI's Learnings tab remains an alternative user-driven path.

Critical parameter rules

• agent_id: Per-session value, injected via additionalContext by the SessionStart hook. Shape: <client>:<repo-basename>. Pass verbatim on project-scoped writes and reads. Pass "meko_agent" for the cross-project common bucket (or empty/omit — server rewrites empty to meko_agent). Ignored on knowledgebase_search. See tools-agent-id-conventions.md.
• conversation_id: the conversation's ID is its trace ID, so every call carrying it becomes a span under that conversation in the Observe hub. On write tools (memory_add, conversation_add_message) pass a real UUID from conversation_create or the SessionStart hook — a nil/empty value orphans the trace. On memory_search it only nests the trace (it does not filter), and empty-string is accepted; on memory_get_all and most read tools, still pass the session UUID when you have one. Never pass "current" or other non-UUID junk.
• When in doubt about optional parameters, omit them. The server has sensible defaults.

Verify after writing

Never confirm a successful save to the user without first validating via a read-back. {"status": "accepted"} or HTTP 200 from a write tool is not proof of persistence — indexing lag, silent server errors, and wrong-datapack routing all surface as "the write looked fine but nothing is there." Always read back before reporting success.

• After memory_add: call memory_search with a distinctive token from the stored text (a name, UUID, rare phrase — not a common word). Assert the new memory appears in the results. Only then tell the user it was saved.
• After conversation_add_message: call conversation_get(include_messages=true) with the returned conversation_id. Assert message_count > 0 and that the new message is in the returned list.
• After artifact_put: operating contract 4 — the locally-computed SHA-256 must match the returned content_hash (a rate-limited or errored put carries none); read back important artifacts via artifact_get and compare bytes.
• On verification failure: tell the user the save did not succeed — do not claim it did. Include the verification-failure detail (empty search, missing message, HTTP error) so they can act — wrong datapack, scope mismatch, expired API key are the common causes.

First-run connection test

On the first Meko tool call in a fresh session (no prior Meko tool call since process start), and whenever the user explicitly asks "is Meko working?" or "test Meko connection", run a canary round-trip before proceeding with their actual request. This is the user-visible proof that the MCP transport, auth, and datapack routing are wired correctly end-to-end — a silent failure at install time will otherwise only surface much later, when real memories go missing.

What it does. Write a canary memory with the shape below, capture the id returned by memory_add, then verify with memory_get_by_id — a direct pgvector row lookup. If the row is returned, delete it (default) and tell the user "Meko connection OK". If any step fails, tell the user exactly which step failed — do not swallow the error. Do not retry: routing errors need to surface, not be papered over. (We use memory_get_by_id rather than memory_search deliberately: mem0 does not index metadata and is inconsistent about indexing the memory text for very short strings, so a search-based canary false-negatives against the real service.)

Canary memory shape. This is the spec; keep the fields stable so support can grep for them.

• agent_id: the session's agent_id (from additionalContext); not a constant
• conversation_id: the session's conversation_id (from additionalContext). If the hook failed and you truly have no conversation_id, call conversation_create first and use the returned id — do not use a nil UUID, it orphans the canary trace.
• text: "Meko connection test: <client> @ <installer-version> — <ISO timestamp>. Safe to delete."
• metadata (JSON): {"type": "connection-test", "marker": "<uuid>", "client": "claude-code" | "claude-desktop" | "cursor", "installer_version": "<x.y.z>", "installed_at": "<ISO>"}

Gating. The canary runs at most once per session. Persist a one-line-per-session marker (JSON { "last_canary_at": "<ISO>", "result": "ok" | "failed", "marker": "<uuid>" }) under ~/.claude/meko-capture/canary-<agent_id-slugified>.json — mirroring the watermark-file convention the capture hook already uses. On session start, check the file's mtime; if it was written during this process's uptime, skip. On success, rewrite the file. When the user explicitly asks to test the connection, ignore the gate and run anyway.

Keeping the canary for support. By default the canary is deleted after read-back. If the user passes --keep-canary (or equivalent) or is debugging an issue with support, leave it in place — the metadata.type: "connection-test" label makes it safe to identify and purge later.

Reporting. This is user-visible — the whole point is to give the user concrete proof. On success: "Meko connection OK (canary round-trip succeeded)". On failure, name the failing step and include the raw error: "Meko canary failed at memory_add: <error>. Likely causes: wrong datapack, expired API key, server unreachable."

Budgeting calls

memory_add takes ~10s for a one-line fact and ~20-30s for document-sized text; memory_search ~2-6s. Sustained bulk ingest throttles to roughly per-call latency — run large ingests as background jobs. memory_search, knowledgebase_search, and memory_add also draw from lifetime per-user quotas on Free/Standard tiers, so budget latency and call count. datapack_id is optional on most tools (default datapack) but required on knowledgebase_search. See tools-known-limitations.md.

Reference sections