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tool chain planner
An execution strategist that maps tool dependencies, enforces pre-flight checks, and builds fail-safe agent plans.
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tool chain planner
Example session with this skill installed
I need to update the inventory levels in the database based on the latest CSV report in S3, then notify the warehouse manager via Slack if any items are below 10 units. Plan the tool chain.
- Read your context and instructions
- Compiled the tool chain planner
- Generated the data export
I have designed a minimal, dependency-ordered tool chain for the inventory update task. No tools have been executed yet.
Tool-Chain Execution Plan
| Step | Tool | Type | Pre-flight Check | Verification Gate | Fallback |
|---|---|---|---|---|---|
| 1 | s3_get_object | Read | Verify latest_report.csv exists and is accessible. | Content is valid CSV and contains 'sku' and 'quantity' columns. | Fail chain; notify user of missing source data. |
| 2 | db_query_inventory | Read | Check DB connection; Read current levels for SKUs found in Step 1. | Results returned for all SKUs; data timestamp is current. | Mark inputs as STALE; proceed with caution or abort. |
| 3 | db_update_stock | Write | Compare CSV vs DB; Ensure no negative values result from update. | db_query confirms new levels match CSV inputs for specific SKUs. | Revert to Step 2 snapshot; log error and stop. |
| 4 | slack_send_msg | Notify | Verify manager ID; Ensure message body doesn't leak sensitive DB strings. | Slack API returns ok: true and timestamp. | Log notification failure to internal ops channel; retry once. |
Dependency Graph & Logic
- Serial Handoff: Step 1 -> Step 2 -> Step 3. (We cannot update without reading the source and the current state).
- Conditional Trigger: Step 4 only executes for SKUs where Step 3 verification confirms
level < 10. - Safety: Step 3 is a protected write. A snapshot of affected rows will be taken in Step 2 for recovery.
Next steps
- Review the proposed sequence and tool parameters.
- Grant permission to proceed with the
db_update_stock(Irreversible). - Confirm if the Slack notification should include the full SKU list or a summary.
tool-chain-planner.csv
CSV · data export
Example file from a real run - the skill writes it into your workspace.
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What you get
About this skill
The problem
Agents often fail by firing tools in the wrong order, writing to targets before reading them, or proceeding on stale memory. Without a sequence plan, a single failed step in a multi-tool chain can leave your system in a corrupted or inconsistent state.
What it does
- Inventories available tool schemas to map inputs, outputs, costs, and side effects.
- Generates a dependency graph to separate parallelizable tasks from serial dependencies.
- Enforces a "Read-Before-Write" discipline to prevent blind state changes.
- Assigns concrete pre-flight checks and fallback patterns (like snapshots or retries) to every call.
- Defines verification gates for each step using specific assertions rather than generic success codes.
Why this beats prompting it yourself
General prompts usually lead to "optimistic execution" where the agent assumes every tool call will succeed. This skill forces a rigorous planning protocol that treats every handoff as a failure point, building in safety checks and state-recovery logic that manual prompting rarely covers consistently.
Use cases
- Executing complex API orchestrations where step 3 depends on the verified output of step 1.
- Managing destructive operations like database deletions or file system overrides.
- Handling financial transactions or cloud resource provisioning that require pre-approval.
- Debugging failed agent runs by reviewing the published execution ledger vs. the intended plan.
Known limitations
Does not invent new tools; it only organizes tools already available to the agent. It will not second-guess user intent, only the safety and order of the execution.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
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Click the path to copy it. Create the folder if it does not exist yet.
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